What was the misfiring code on my 1999 Chevy S-10?

First we replaced the plugs that were the wrong ones. With the computer conected we monitored the live data and were recordeing most of the misfires in cylinder 6, 4, 2 with an occational misfire on 5. We had no codes recorded in the ECM but the fuel trims were way off.

What causes acceleration in a 97 Chevy Blazer?

97 chevy blazer 4.3 idles great but upon acceleration it starts to surge, changed just about everything, fuel pump,cap rotor, wires, plugs distributor injectors, crankshaft, cam, throttle pos. sensor, tried new computer, at a loss starts right up and idles great, take in down the road and starts surging. Exhaust?

Why did my Chevy S-10 misfire in the morning?

My morning misfire was caused by a bad intake manifold gasket (a very common problem with most gm models around 2000 model year. Caused by crappy dexcool coolant ). After sitting overnight a small amount of coolant would get into right rear cylinder. It would miss for a bit and then run fine. Doesn’t have to be leaking a lot either.

What’s the problem with my Chevy S10 4.3?

I have this same problem with my 99 s10 4.3. the code reader says miss fire cylinder #2… so I replaced wires, plugs, distributer cap and rotor. after 2 days this problem got worse. again I read the codes and it read the same code, cylinder #2. good old GM I guess 71 people found this helpful.

Why does my Chevy S10 have a misfiring gasket?

“The dreaded mystery coldstart misfire.” I like many others had the shudder between 1500-1800 rpms until the engine came up to operating temperature. I just found the root of all evil hiding under the EGR valve. Removed EGR to clean and realized there was a blow by in the gasket.

What are symptoms of bad crankshaft position sensor?

Problems with the crankshaft position sensor will often present as problems with engine timing. If you think your sensor has failed, here are some common symptoms of a bad crankshaft sensor that can help you in determining whether or not it has failed. As the engine speeds up, there needs to be adjustments to spark timing and fuel injection.

What’s the trouble code on a Chevy Blazer?

The P0300 Chevy trouble code will trigger the Blazer’s service engine soon light. The vehicle itself may begin to run rough. It depends on how serious the misfire is. The vehicle may produce excess vibration, especially at lower RPM conditions P0300 Trouble Code Diagnosis- Chevy Blazer

What causes the P0300 trouble code on a Chevy Blazer?

There are quite a few things that can cause the P0300 trouble code to trigger in the Chevy Blazer. Here are the most common problems that will throw the code. They are presented somewhat in order from most to least likely to be causing the code:

Are there any misfires in the Chevy S-10?

The misfires still occured but only when the RPMs were above 800. The last test was to ohm the ignition wires. They tested out poorly. We changed them and then went for a 2 drive cycle to clear the internal codes since we needed to get the vehicle smogged. The vehicle passed with flying colors.

Is there a code for cylinder 4.3 misfiring?

With the computer conected we monitored the live data and were recordeing most of the misfires in cylinder 6, 4, 2 with an occational misfire on 5. We had no codes recorded in the ECM but the fuel trims were way off.

Is there cylinder 6 misfire on Chevy 4.3L?

This feature is not available right now. Please try again later. Chevy 4.3L OBD-II code P0306 is generic cylinder 6 misfire detected. In this video we take apart the engine in order to solve this nasty and annoying also very common issue on GM 4.3L engines. SUBSCRIBE ON YOUTUBE! LET’S CONNECT! Loading…

What is the OBD code for Chevy 4.3L Vortec?

Chevy 4.3L OBD-II code P0306 is generic cylinder 6 misfire detected. In this video we take apart the engine in order to solve this nasty and annoying also very common issue on GM 4.3L engines. SUBSCRIBE ON YOUTUBE! LET’S CONNECT! Loading…

Are there any problems with the Chevy 4.3 Vortec engine?

The 4.3 Vortec engines made from 1996-2002 (L35 and LF6) have been reported to have engine knock problems. In a properly functioning engine, fuel burns in even pockets instead of all at once. The pockets burn in even timing, in sync with engine cycles. Engine knock occurs when the fuel burns unevenly and out of sync with the engine cycles.

What are the symptoms of a failing Vortec distributor?

Symptoms of Failing Vortec Distributor 1 Engine misfires 2 P0300 to P0306 engine codes (for misfire) 3 Engine is slow to start, or not starting 4 Poor idling, acceleration, etc. (usually caused by misfires)

Why are sales of the Chevrolet Blazer so bad?

Six out of the top ten best-selling SUVs in America saw significantly worse numbers in January compared to a year ago; with little apart from style to really distinguish it from the hundred other blobs sold across General Motors brands, an extended, industry-wide sales slump could leave the Chevrolet Blazer dangerously exposed.

Why is the Chevy Blazer called the K5?

The author’s K5. As to why this sport-ish CUV is wearing such a weighty name, well, that’s a conservative shop like GM for you. I’ll admit it’s annoying, especially as the owner of a 1988 K5. (Though if it somehow increases the value of my truck, hey, go for it.) But the bigger problem is how this approach could spell trouble for the automaker.

Why does my 2001 S10 have a hard starting problem?

My 2001 S10 has a hard starting problem if the truck sits between 1 to 4 hours. It starts fine if left over night. Has 46,000 miles. Cranks for about ten seconds before it starts. some part of your fuel injector is leaking into the manifold. Have fuel pressure tested, have a feeling it will shoot up to the desired 60 psi then fall back now quickly.

Is the Chevy S10 extreme 4.3 W misfiring?

11 people found this helpful. my 99 s10 extreme 4.3 W missed at the idle driving speed range for years got worse when it was damp outside.stomp down on the gas and fine.it also started and idled well it was just the normal driving range.

What causes a p0171 Bank 1 lean condition?

Most likely possible causes for this P0171 bank one lean condition per manufacture. Ford, Lincoln and Mercury cars and trucks: Air or vacuum leak, Oxygen Sensor or Mass Air Flow Sensor.

Where is the blow by Valve on a Chevy S-10?

Removed EGR to clean and realized there was a blow by in the gasket. Removed gasket and noticed it was on the topside and underside of the gasket. Scraped the remainder off, cleaned the surface, and installed new gasket with original EGR valve.

What should the fuel pressure be to start a Vortec engine?

The fuel system in your 4.3L, 5.0L, or 5.7L Vortec engine needs at least 50 PSI of fuel pressure to start. The fuel pump produces much more than just 50 PSI of course but the bare minimum the engine needs to start is 50 PSI… so anything less and it will crank for ever before it starts or not start at all.

What should the fuel pump pressure be to start the engine?

The fuel pump produces much more than just 50 PSI of course but the bare minimum the engine needs to start is 50 PSI. Anything less and it will crank for ever before it starts or not start at all. So, the very first thing you need to do is to verify that the fuel pump is delivering at least 50 PSI of fuel pressure while the engine is cranking.

What should the fuel pressure be on a GM 4.3L?

This is where you’ll connect your fuel pressure gauge (the first photo, in the image viewer, is of a 4.3L, and the second of the V8 engine). NOTE: In case you’re wondering, the factory manual specifies that the fuel pressure for the CSFI system should be between 56-62 PSI. The CPI system’s fuel pressure should be between 60-66 PSI.

What should the fuel pressure be on a CPI?

The CPI system’s fuel pressure should be between 60-66 PSI. The manual doesn’t specify if this pressure is key on engine off, only that this pressure should be maintained ‘ under all operating conditions’.

What causes a misfire on a 94 S-10?

Typically if the lower intake gasket leaks vacuum, it only affects one cylinder and causes a noticeable misfire all the time. On your engine, the ECM batch fires the injectors, it can not richen the mixture for individual cylinders.

Where was the ignition located on my 93 S-10 Blazer?

My old 93 S-10 blazer had an internal Ignition Module, inside the bottom of the distributor. I know this much, if those little PIA’s start winking out, you will see all kinds of issues similar to what you are describing.

What causes hesitation and surging on Blazer 4.3L?

Fix Hesitation and surging on Blazer 4.3L If you have Hesitation and surging on Blazer 4.3L and it’s driving like a dog—poor acceleration, hesitation, or a surge and you suspect a fuel problem, you may be partially right.

How can you tell if your car engine is misfiring?

Rough acceleration is a typical sign that your engine is misfiring. Sometimes, the engine will misfire on idle also; your engine sensors will get faulty values, and the air-fuel mixture will get messed up. This can cause a very uneven idle, which can jump up and down, and the engine may also shut off on idle.

What does 0 psi mean on fuel gauge?

CASE 2: The fuel pressure gauge’s needle DID drop down to 0 PSI immediately after the Key was turned to the Off position: This tells you that there is something leaking inside the plenum. More than likely, it’ll be the fuel pressure regulator, to make sure go to: TEST 2.

What should fuel pressure be on GM 4.3L Vortec?

You can find this tutorial in Spanish here: Cómo Probar La Bomba de Combustible (GM 4.3L, 5.0L, 5.7L) (at: autotecnico-online.com ). The fuel system in your 4.3L, 5.0L, or 5.7L Vortec engine needs at least 50 PSI of fuel pressure to start.

Why does my 1994 Chevy S-10 not start?

1994 Chevrolet S-10 4.3 tbi. I never get the signal to turn on the fuel pump or fire the injectors but if i poor gas in the intake once the truck starts it runs fine. Any ideas ? I have replaced the fuel pump relay oil pressure switch and computer.

What was the misfiring code on my 1999 Chevy S-10?