What are the symptoms of a bad intake manifold gasket?

Coolant leaks Another symptom of a faulty intake manifold gasket is coolant leaks. Some intake manifold gaskets also seal engine coolant, and if the gasket wears out it may lead to a coolant leak. This may produce a distinct coolant smell, along with steam, and drips or puddles of coolant underneath the vehicle.

Where are the intake gaskets on a Chevy Vortec?

The intake gaskets on the LB4 and L35 vortec’s are very prone to going bad which results in engine leaks, overheating, stalling, etc. The intake gasket sits between the intake manifold and the cylinder head.

What kind of intake manifolds do GM engines use?

Chevrolet Performance intake manifolds were designed specifically for GM engines, so you know they will deliver OE performance. Dual-pattern carburetor flange is approximately 1/2″ lower than the 1970 LT1 intake, yet produces the same horsepower NOTE: Open carburetor spacer is not recommended for use with dual-plane intake manifolds.

Can a bad intake manifold cause a coolant leak?

Coolant leaks. Another symptom of a faulty intake manifold gasket is coolant leaks. Some intake manifold gaskets also seal engine coolant, and if the gasket wears out it may lead to a coolant leak.

Can a 4.3 Vortec intake gasket be replaced?

Your guide to replacing faulty intake gaskets on the 4.3 Vortec engine. This is specifically for the 4.3 in a 99′ Silverado, but should be very similar to Blazer/Jimmy’s. Notes and links below:

Symptoms of a Bad Intake Manifold Gasket – Chevy 4.3L 1 Engine misfires 2 Sluggish acceleration, lack of power 3 Lean or rich air to fuel ratios 4 Engine overheating 5 Low coolant light illuminating 6 Leaking coolant / dripping onto garage floor More

Where can I buy a Chevy 4.3L intake manifold?

Select your preferred location and we’ll note which parts are ready to be picked up TODAY. Sold as a set. (12) Sold as a pair. (1) Sold individually. (1) Select your preferred location and we’ll note which parts are ready to be picked up TODAY. Intake Manifold Gaskets, Marine, Printoseal, OEM Port, 6 Bolt Holes, Chevy, 4.3L, V6, Set

Coolant leaks. Another symptom of a faulty intake manifold gasket is coolant leaks. Some intake manifold gaskets also seal engine coolant, and if the gasket wears out it may lead to a coolant leak.

How does a head gasket cause an engine misfire?

Step 20 – A head gasket is used to seal the cylinder head to the engine block. The cylinder head is fastened to the engine block using head bolts that are tightened to a specific torque. When a head gasket wears (blows) it can allow coolant or exhaust gasses to enter the combustion chamber causing a cylinder misfire.

Why does my GM V8 engine misfire when cold?

Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174. But, as the engine warms up, the engine misfire or rough idle tends to go away; which seems confusing.

What happens when an intake manifold gasket goes bad?

A vacuum leak caused by a bad intake manifold gasket can throw off the engine’s air-fuel ratio and cause engine performance issues such as misfires, a decrease in power and acceleration, a reduction in fuel efficiency, and even stalling.

Can a bad timing chain cause an engine to misfire?

Engine misfires. The timing chain method is more common with consumer vehicles and high performance engines. Over a period of time, the timing chain can stretch, which can cause the chain to skip a gear on the cam or crank shaft. This results in the engine’s timing to fall out of calibration and often results in a misfire.

What causes an engine to not start while driving?

A broken timing chain will cause an engine to not start or fail while driving. If the belt is already broken, the engine won’t have enough compression to start. If it breaks or jumps while driving, the pistons will be damaged from contact with the valves. The valves themselves will bend and potentially ruin the engine.

Can a bad intake manifold cause an engine to stall?

This can happen when a faulty intake manifold gasket causes a vacuum leak, which messes up the ratio of air to fuel. Then you could be driving and all of a sudden experience a stalling engine. Of course, there could be many other reasons for a stalling engine, but a bad intake manifold gasket is surely one of them.

What makes an intake manifold a Fel-Pro gasket?

Most Fel-Pro® Performance intake manifold gaskets are designed without a metal core, to allow engine builders to trim the gasket for exact fit on modified ports. The base gasket material resists coolant, gasoline, alcohol and oil. As needed, Printoseal® elastomeric sealing beads are used to provide the extra sealing strength needed around the port.

What to do if your intake manifold gasket fails?

If your engine is overheating, you will want to rule out other parts of the cooling system to make sure you are replacing the right part. A leak down test will tell you if your head gasket has failed or the head has cracked instead. You could also test the thermostat to ensure it is working properly.

Can a bad intake manifold cause engine damage?

Engine overheating. If the intake manifold gaskets leak coolant into the intake manifold the engine may overheat as a result, without any visible external leaks. Any coolant leaks should be addressed as soon as possible to prevent the possibility of serious engine damage occurring due to a bad intake manifold gasket.

Can a leak in the intake manifold cause a bad smell?

Some intake manifold gaskets also seal engine coolant, and if the gasket wears out it may lead to a coolant leak. This may produce a distinct coolant smell, along with steam, and drips or puddles of coolant underneath the vehicle. Coolant leaks should be addressed as soon as possible, in order to prevent them from becoming a greater issue. 3.

Which is more important the cylinder head or the intake manifold?

However, there is no gasket more important to the engine than the intake manifold gasket. This particular gasket goes in between the cylinder head and the intake manifold in order to provide a seal there. As you may know, the intake manifold is responsible for delivering the mixture of air and fuel to the cylinders.

What causes an intake gasket on a Vortec to leak?

Leaking Intake Manifold Gasket The intake gaskets on the LB4 and L35 vortec’s are very prone to going bad which results in engine leaks, overheating, stalling, etc. The intake gasket sits between the intake manifold and the cylinder head. It is responsible for sealing engine vacuum, and also engine coolant.

What happens if you have a bad valve cover gasket?

Engine is low on oil As oil leaks from the valve cover gasket, it leaves the oil pan. When this happens frequently, it can cause the Engine Oil Light to appear on your dashboard. If the engine oil is low, it will reduce its ability to properly lubricate internal engine components.

What kind of engine does a Chevy K3500 have?

After having been somewhat disappointed in what the automotive aftermarket had to offer for these engines Jim went to work, and created some products for his truck at the time, a 1994 Chevrolet K3500 Dually Crew Cab with the GM 6.5 Turbo Diesel Engine.

Why is my Chevy C / K 1500 still running?

Running great, but check engine still on. Old oem muffler was rattling at idle for months but still quiet while driving so I put it off. Finally got new aftermarket muffler installed, went out on freeway anf pedal to the metal. Olay!

What’s the fuel pressure on a Chevy C / K 1500?

With key on i have about 60psi fuel pressure but idleing i only had 50psi. I put a complete new fuel pump unit in and changed fuel filter. Same problem. no different fuel pressure.

Can a failed gasket cause an engine to stall?

This is a tougher symptom to attach to a failed gasket though, as there are actually quite a few reasons why an engine may stall. If it presents with one of the other symptoms, then definitely check out your manifold intake gasket.

What are some common symptoms of a bad intake gasket?

Coolant leak. One of the most common signs of a weary gasket is a coolant leak.
A rise in temperature. Check your temperature gauge indicators.
Engine overheating. A damaged gasket will lead to a coolant leak.
Engine’s decrease in power or loss of acceleration.
Disrupted fuel economy.
Stalling engine.

What happens when you blow an intake manifold gasket?

The intake gasket provides a seal between the intake manifold and the cylinder head in a car’s engine. Gaskets are subject to extremely high temperatures and pressures. A blown intake gasket can cause havoc in an otherwise healthy car engine, but the symptoms can be difficult to detect. Many are ambiguous and can represent different problems.

Can I Drive my Car with a bad intake manifold gasket?

Yes. The principal concern with a leaking intake manifold gasket is potential damage to the engine, depending on where the leak is. Although the vehicle will generally be safe to drive, you should schedule service as soon as possible to minimize the chances of additional costly damage.

How much to replace the intake manifold gasket?

On average, the cost to repair the intake manifold gasket will depend on the mechanic you visit, where you live and the car you drive. On average, the complete repair, with labor and parts included, will be in the $300 to $1.050 range.

How to replace an intake manifold in a car?

10) Remove the lower intake manifold. Remove the four middle bolts first and then the four outer. Put them in a cardboard box, punching holes and marking their locations. I had to use a crowbar on an exposed corner (very carefully) to get it out. 11) Remove the pushrods and similarly put them in a box.

How to replace the intake in a 3.1L engine?

Three fasteners (10mm) hold it. 6) Unbolt the evaporative canister purge solenoid valve. It bolts with a 10mm to the end of the upper manifold cover. There is a hose going to the PCV valve on the front valve cover and another to the manifold itself. Move it off to the side. 7) Remove the EGR valve.

What’s the best way to replace an intake manifold?

Then use a small pry bar to gently pop the in lower intake from the gaskets and remove the lower intake. ( Note: Before removal use an air pressure to clean excess dirt from the intake area.) After the lower intake has been removed, use a gasket cleaner (scraper) to rid the gasket surface of any old gasket/glue etc.

How can I tell if my intake manifold is leaking?

If it’s not at the hoses or the radiator, chances are good it’s in a gasket. First, check the head gasket to see if that’s the source of the leak. If everything looks good, double-check the thermostat before moving onto the intake manifold gasket. Now, this type of leak will leave a very obvious residue all around the seal.

What are the gaskets on an engine called?

The intake manifold gaskets are some of the most important gaskets found on an engine. Gaskets are the seals placed between engine components before they are assembled in order to provide a reliable seal.

The intake manifold gaskets are some of the most important gaskets found on an engine. Gaskets are the seals placed between engine components before they are assembled in order to provide a reliable seal.

What should torque be for lower intake manifold?

The following are the torque specifications for the lower intake manifold bolts: Step 1: tighten to 27 INCH Lbs (3 N.m). Step 2: tighten to 106 INCH Lbs (12 N.m). Step 3: tighten to 133 INCH Lbs (15 N.m).

Why is my GM 4.8l engine running too lean?

The engine may be running too lean, due to a leaking intake manifold. Too lean means too much air and not enough fuel; according to the power control module (PCM) calculation. When the engine is cold, not all sensors function. As the engine warms up the oxygen sensors report the lean condition.

What causes a vaccuum leak on a Chevy Tahoe?

The hoe is having the same issues its been having with the tuned pcm, but with the stock computer now. I unplugged the MAF, the problems went away. So i replaced the MAF, same problems. Im pointing to a vaccuum leak because of these stupid intake gaskets. Any ideas? check front and rear, leaks were notorious on those.

Can a Vortec intake manifold leak all the time?

It uses a only certian sensors to help it untill the O2’s are up to temp and can be read by the pcm. If you have an intake leak of unmetered air getting into the engine the pcm will see it in the O2’s sensors in closed loop and correct as much as it can. Thats why I ask if it will do it all the time or just when it’s up to temp.

What’s the best gasket sealant for a thermostat housing?

In the case of your thermostat housing gasket, if your surfaces are good and clean, apply GasGaCinch to the housing and the gasket, let it tack, insert the thermostat and apply the gasket. Then bolt it up. No need for any adhesive/sealant on the intake manifold.

Which is the most important gasket on an engine?

Average rating from 129,829 customers who received a Vehicle Engine Mechanical Inspection. The intake manifold gaskets are some of the most important gaskets found on an engine. Gaskets are the seals placed between engine components before they are assembled in order to provide a reliable seal.

How to replace intake gaskets on a GMC Truck?

To replace the intake gaskets the concensus is to use Felpro gasket set MS98000T. This set comes with the two instake gaskets, upper intake plenum gasket, throttle body gasket, fuel injector assembly gasket, fuel line o-rings where they attach to the manifold, valve cover gasket, and what i think was a distributor gasket.

How much does it cost to replace intake manifold gasket?

A mechanic can replace an intake manifold gasket for a few hundred bucks including parts and labor. It is one of the more complicated engine repairs, but could be within the remit of an experienced and well equipped at home mechanic.

Another symptom of a faulty intake manifold gasket is coolant leaks. Some intake manifold gaskets also seal engine coolant, and if the gasket wears out it may lead to a coolant leak. This may produce a distinct coolant smell, along with steam, and drips or puddles of coolant underneath the vehicle.

How much should it cost to replace intake manifold gasket?

What is a lower intake manifold gasket?

The lower intake manifold is a cast aluminum or molded plastic chamber bolted to the cylinder head of the engine. The intake manifold must be tightly sealed to the cylinder head (s) using a gasket in order to prevent air, oil, or engine coolant leaks.

How to tell if your head gasket is blown?

How to tell if your car’s head gasket is blown DIY with Scotty Kilmer. How to tell if your head gasket is leaking and needs repair. How to test engine head gasket by using this simple leak test kit. DIY car repair with Scotty Kilmer, an auto mechanic for the last 42 years. 1. Bluetooth Scan Tool: http://amzn.to/2nfvmaD 2.

Some intake manifold gaskets also seal engine coolant, and if the gasket wears out it may lead to a coolant leak. This may produce a distinct coolant smell, along with steam, and drips or puddles of coolant underneath the vehicle. Coolant leaks should be addressed as soon as possible, in order to prevent them from becoming a greater issue. 3.

What causes a car to not start with no gas?

Problem may be at wiring connector on top of fuel tank (hard to reach!). No gas in fuel tank (Check the fuel gauge, and keep in mind the gauge may not be reading accurately). Bad gas (Contaminated with water or too much alcohol or diesel fuel). If you just filled up with gas and now your car won’t start, suspect bad gas.

Can a gasket leak cause a fuel trim problem?

A fuel trim problem can occur if the intake manifold has the tiniest leak. If you just use your eyes and ears to find the leak, it will become very time-consuming. So, Anytime air leaks through the intake manifold, it will cause air to get sucked in. Whatever is in the air that’s pulled in, will compromise the mixture of the fuel and air.

What makes the gaskets on an intake manifold?

Intake manifold gaskets, can be made of paper, rubber, metal, and sometimes a combination of the three. Intake manifold gaskets, are responsible for sealing the intake manifold, against the cylinder head (s). So, having any type of intake manifold leaks, can spell trouble for your engine.

Can you see a leak in an intake manifold?

If coolant leaks on the outside of the gasket, then you can see it. However, if there are internal leaks going into the oil or combustion chamber; you won’t be able to spot them. So, what you’ll want to do is, give your system a complete inspection.

Can a faulty intake manifold cause engine overheating?

When the intake manifold gaskets have an issue; they can cause drivability problems and even engine overheating. Usually a faulty intake manifold gasket, will produce a few symptoms; that can alert the driver of a potential issue.

Why is smoke coming out of my intake manifold?

The (PCV) system must be blocked off as well. If the PCV system or oil filter has smoke coming out of it and the engine is not misfiring; then it probably means there is a crack or leak underneath the intake manifold. Most of the time this will also cause, high oil consumption.

Why is the oil leaking from my Dodge Grand Caravan?

February 2021 at approximately 93,000 miles extensive oil leaking damage. Car is leaking oil from the oil filter housing unit including the gaskets around. At this point, the correct part is on back order from Chrysler, per the dealer where purchased the car, I am number 28,000 plus in the line to receive this part.

Why is my intake manifold leaking on my Dodge Caravan?

In engines where coolant flows through the intake manifold, a leaking intake manifold gasket can be either the cause of or result of engine overheating. If you have a leaking intake manifold gasket, and the engine has overheated, the entire engine should be inspected for damage, such as a blown head gasket.

What causes a leaking intake manifold?

When there is a leak in your intake manifold gasket, it is important that you know what the cause is so that you can prevent it from happening again and again. Something that may cause a leak in the intake manifold gasket is oil and coolant mixing together.

How much does it cost to repair an intake manifold gasket?

Is it safe to drive with a bad intake manifold?

Any issue with the intake manifold gasket is critical. Although it is relatively safe to drive with a faulty gasket, it is not advisable. The longer it stays in the manifold, the faster it will destroy your engine wholly. That is why any minor issues in the gasket need immediate addressing

Why is the intake manifold important to an engine?

The intake manifold gasket is one of the most important parts of an engine’s combustion chamber. They hold a bunch of engine parts together. They also work to deliver a smooth and harmonious performance. Failure to keep tabs on your gasket can lead to a damaged engine over time.

Why do you need an intake manifold gasket?

Your intake manifold gasket seals it against the cylinder head. This keeps the fuel and air mixture airtight. In some cases it also separates the fuel and air channels from the coolant channels. A bad intake manifold gasket can cause coolant leaks, overheating, and misfires. You may also notice decreased gas mileage.

What are the symptoms of a bad intake manifold?

One of the recognizable symptoms of bad intake manifold gasket is coolant leaks. Intake manifold gasket works as a seal for the coolant of your car engine. Generally, when this seals were damaged, then the coolant will flow out over the seal.

What causes coolant to leak from the intake manifold?

After confirming the coolant leak, you need to find the location of leaking. If the coolant is leaking out through the joining point of the engine and the manifold, then it happens only for the damaged gasket. The coolant can also leak through the radiator or the rubber pipes. 2. Engine Overheats

What should I do if my intake manifold is leaking?

Start your car and then let it idle on the position. Spray the carb cleaner (what you think works well) at the joint of the intake manifold with the engine. Don’t bath your full engine area with carb cleaner at a time.

Can a blown intake gasket cause an external leak?

External Leak. Coolant may seep out of the broken gasket and flow across the outside of your engine. You will see orange coolant dripping under the frame of the car onto the road or driveway. A bad leak will cause a big puddle. With a small leak, the coolant may not make it that far, but there still could be a couple spots under the car.

Is it possible to replace an intake manifold in a Ford?

Ford does not make replacement gaskets available, without the purchase of a new intake manifold. Often the leak is not visible from the outside and flows into the area under the manifold. In these cases, the symptom is a loss of coolant, with few outside indications. Replacing the intake manifold is difficult, but can be done with the proper care.

External Leak. Coolant may seep out of the broken gasket and flow across the outside of your engine. You will see orange coolant dripping under the frame of the car onto the road or driveway. A bad leak will cause a big puddle. With a small leak, the coolant may not make it that far, but there still could be a couple spots under the car.

What causes coolant to pool in the intake gasket?

Dripping coolant may pool under the housing of the thermostat. Coolant may flow through the gasket to the inside of the engine and mix with the oil. Pull the oil dipstick out and look at it. Oil mixed with coolant will have a thick consistency.

Which is responsible for sealing the intake manifold?

Intake manifold gaskets are responsible for sealing the intake manifold against the cylinder head (s). So, Having any type of intake manifold leaks can spell trouble for your engine. Apart from sealing engine vacuum, certain intake manifold designs will also seal engine coolant.

What happens to the intake manifold on a Ford F-150?

The intake manifold gasket on the F-150 is heat, chemical and abrasion resistant, and usually lasts quite a long time — over 100,000 miles. The gasket eventually dries out, allowing air to leak into the engine and oil to leak out of the engine.

How do you change the intake gasket on a Ford F-150?

Loosen the clamp on the upper radiator hose at the thermostat, using a screwdriver. Pull the hose off the thermostat housing. Disconnect the heater coolant hose from the bypass tube, using a screwdriver.

Can a smoke machine leak the intake manifold?

If you have a smoke machine, then multiple leaks can be diagnosed in a shorter amount of time. This machine does this by, allowing the intake manifold to become pressurized; while placing vapor and smoke into the system. So, if a leak truly does exist, then smoke will be drawn out. Firstly, find a vacuum port and attach the smoke machine to it.

Can you have white exhaust smoke with a blown intake?

Smoke coming from the exhaust indicates a problem with your car, but the color of the smoke can point you towards the correct diagnosis. Different smoke colors can be caused by the following issues: grey or black smoke can be a rich condition, white smoke can be burning coolant, blue smoke can be burning oil. Intake manifold leaks.

What causes water to come out of the exhaust system?

As your engine cools down, the water vapor in your car’s exhaust system cools down to form water. The water is released from the exhaust system as droplets when the engine is warmed. Water formed through this process should not cause alarm.

Why is water leaking from my exhaust manifold?

If your air supply is getting into the exhaust side of the manifold, the manifold is bad. When you have set this up add air up to no more than 20 psi. Watch the pressure gauge and see that it holds the same reading for a long time, hours. If it doesn’t it is leaking to the exhaust gas side and it is a bad manifold.

What causes white smoke from an intake manifold?

Different smoke colors can be caused by the following issues: grey or black smoke can be a rich condition, white smoke can be burning coolant, blue smoke can be burning oil. A leaking intake manifold gasket can cause white smoke from the exhaust, if the engine has coolant flowing through the intake manifold.

Where does coolant come from in a blown head gasket?

A head gasket leaking external would cause coolant to come from below the intake or exhaust manifold and often only happens when the engine is completely warmed up.

What causes a blown head gasket on a GM 4.3L?

You can find this tutorial in Spanish here: Cómo Probar Los Empaques De Las Cabezas (GM 4.3L, 5.0L, 5.7L) (at: autotecnico-online.com ). The most common cause of a blown head gasket is that the engine overheated because: 1) Fan clutch is not working, 2) All of the coolant leaked out of the engine and you kept driving it this way.

Can a head gasket leak lead to an intake manifold leak?

Manifold Gasket Leak A leak in the intake manifold gasket can lead to coolant running down the sides of a vehicle’s engine. A head gasket can leak either coolant or compression. Some motors are prone to coolant leaks in their intake manifold gaskets.

What causes coolant to leak from head gasket?

These vehicles, however, are usually equipped with plastic manifold gaskets which tend to fail sooner than other gaskets. A head gasket can leak either coolant or compression. Coolant leaks in a head gasket will be discovered fairly quickly due to the fact that an engine will run hot as a result.

You can find this tutorial in Spanish here: Cómo Probar Los Empaques De Las Cabezas (GM 4.3L, 5.0L, 5.7L) (at: autotecnico-online.com ). The most common cause of a blown head gasket is that the engine overheated because: 1) Fan clutch is not working, 2) All of the coolant leaked out of the engine and you kept driving it this way.

Apart from sealing engine vacuum, certain designs will also seal engine coolant. When the intake manifold gaskets have an issue, they can cause drivability problems and even engine overheating. Usually a faulty intake manifold gasket will produce a few symptoms that can alert the driver of a potential issue. 1.

What are the symptoms of bad intake manifold runner control?

One of the first symptoms of a faulty intake manifold runner control is difficulty starting the engine. The intake manifold runner control is usually positioned when the vehicle is started.

Can a cracked intake manifold be repaired with K-seal?

K-Seal can permanently repair a cracked or leaking intake manifold which can cause engine overheating.

One of the first symptoms of a faulty intake manifold runner control is difficulty starting the engine. The intake manifold runner control is usually positioned when the vehicle is started.

K-Seal can permanently repair a cracked or leaking intake manifold which can cause engine overheating.

Why is my 2.4L Chevy Malibu losing coolant?

2.4L engine is mysteriously losing coolant. Did pressure and cylinder tests, could not find any reason for the problem (though the engine continues to lose coolant). Check engine light; dealer claims error code indicating poor fuel. Added octane booster, reset light, suggested I use better quality fuel.

What kind of engine problem does Chevy Malibu have?

Turned out to be a slow leak in a related valve only discovered after an overnight test 252-horsepower 3.6L V6 6-speed shiftable automatic FWD

Why do I have low compression in all cylinders?

If you have low compression in all cylinders, this is often the culprit. Also, your compression leak may not be in the pistons or head gasket but in the valves. Exhaust valves and air intake valves at the top of the cylinder can also get overheated, and leak gas or the valve seals can become too worn to seal the gas in properly.

Can a blown head gasket cause low compression?

If two cylinders next to each other both have low pressure, a blown head gasket is a likely culprit. If you discover you do have low compression, the only solution is to replace the leaking part whether it’s the piston, piston ring, camshaft, head gasket or valves.

Why does my Chevy Blazer misfire at 2500 rpm?

A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. The next test drive indicated that he was right and it was very repeatable.

How many miles does a 2002 GMC TrailBlazer use?

I have a 2002 gmc envoy slt 6 cylinder with 274,500 uses no oil and is very powerful. 12 people found this helpful. I have a 2002 Trailblazer with 469,200 miles on it at present. It is not using any oil, has always had regular 3000 mile oil changes.

Why is my speedometer, rpm gauge and fuel gauge not working?

Q: My speedometer, rpm gauge and fuel gauge are not working; possible gear slipping and high rpm. I recently had a used motor put in my vehicle about 6 months ago when there was an oil build up which is commin in this engine i guess, and a new starter about 6 weeks ago.

What causes a CMP sensor to break in an engine?

It’s not uncommon for a CMP sensor internal circuitry to develop an electrical open. This is usually caused by the sensor being exposed to engine high operating temperatures. High temperatures can break a wire. The broken wire may still make contact while the engine is cool.

What are the symptoms of a bad intake manifold gasket?