Why is my Chevy Trailblazer running rough at idle?

Really, your Trailblazer will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Trailblazer happens to have them, they can go bad and cause a rough idle.

What makes a rough idle a misfire condition?

What complicates a rough idle/misfire condition is having the PCM not register any specific misfire codes. In my neighbor’s Blazer, the PCM wasn’t even registering a P0300, but it was obviously running very rough (at idle that is).

Why is the air filter on my trailblazer not working?

If you have reason to suspect that your Trailblazer’s air filter has not been changed in a very long time, or if you have recently been driving in tough conditions, it may be worth taking a look at it. It could be so clogged that there is not enough air getting through for quality idle conditions.

What causes a Chevy Trailblazer to run out of gas?

A couple things to check….look to see if the fuel pressure regulator is leaking, that would cause a problem like you describe. Also, if the intake gasket has a vacuum leak, it cause the same issue, but go away after the truck has warmed up a few minutes. Either of those two things can cause the issue you’re having with your Sierra.

Why are the spark plugs on my trailblazer not working?

Spark Plugs – One of the absolute most common causes (if not the most common reason that your Trailblazer may be misfiring) is the spark plugs. Although most modern vehicles use iridium spark plugs, they still need to be changed at the manufacturers recommended interval.

Why does my Chevy truck smell like gasoline?

If fuel is taken into the engine but fails to burn, it will give a gasoline odor to the exhaust. Faulty ignition components such as spark plugs, ignition wires, or distributor components may cause ignition failure. One or more cylinders on your Chevy truck might not be firing — meaning that fuel’s going in but not burning.

Is there an issue with the Chevy Trailblazer?

Trailblazer (Envoy, Bravada) idling issue, even worse when turning on the AC, the car would just completely shut off. Would go below 500 RPM. Simple solution, clean the throttle body, connected to the electronic idling motor.

What to do if your Trailblazer goes below 500 rpm?

Would go below 500 RPM. Simple solution, clean the throttle body, connected to the electronic idling motor. This is a 2004 Trailblazer with the 4.2 inline 6 cylinder engine in it, but this issue is common with the whole generation, 2002-2009 (1st generation Trailblazer, and other vehicles with the same engine/throttle body/electronic idling motor).

What are the sensors on a Chevy Trailblazer?

The oxygen sensors that are equipped in your Chevy Trailblazer are responsible for monitoring the exhaust to help the ECU determine the correct air/fuel mixture. Of all the sensors equipped in your vehicle, the O2 sensors may have it the hardest.

What causes a car to idle rough at idle?

A clogged fuel filter stops the engine from receiving the right amount of fuel causing the engine to be rough idle. Fuel filters are often pretty cheap, and you can easily get the fuel filter removed and replaced from a nearby mechanic or do it yourself if you have some knowledge. 6. Dirty Air Filter

Why does my Chevy Trailblazer have a rough idle?

While there are a variety of reasons your Chevrolet Trailblazer has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. See what others are asking about their Chevrolet Trailblazer. Get answers from RepairPal’s community of auto experts and enthusiasts.

Can a 2.2L engine misfire at idle?

Above idle, at faster engine RPM, there is no time for the cylinder to leak, so no engine misfire. The repair for this particular engine misfire is to replace the cylinder head and bad valves. This aluminum head is not repairable, so replacement is required. Again, this problem is specific to the 2005 through 2009 2.2L and 2.4L.

What should I do about my Trailblazer engine misfire?

Any clue on why this is happening to all the 4.2 cyl heads???? misfire in #6 cylinder. replaced fuel injector, coil, spark plugs. inspected by 4 mechanics and agree vehicle needs valves replaced. lowest quote is $1800. I know of 3 other Trailblazer owners that have or is experiencing the same thing.

Why is the Check Engine light on on my Chevy Trailblazer?

It Had the obligitory disfuntional instrument gage panel. On 9/15 It started missing on #6 2 weeks ago. I replaced the plugs but it got worse and idles very rough now with bad pickup. The Check Engine light is flashing.

Why does my car rough idle but no check engine light?

This issue is normally caused by low fuel pressure or a faulty injector, but since you have just replaced the fuel pump, this may also be a sign of a failing idle air control (IAC) valve. This is a unit that is located on or near your intake manifold that monitors the air intake as it is mixed…

What causes a car to overheat when idling?

That said, some of the the basic things you can check when your car overheats at idle include: The coolant level. Only check when the engine is cool. Low coolant can cause overheating. Air bubbles in the cooling system can also cause issues. Only use the specified type of antifreeze to top off the system. Fan belt problems

What are the O2 sensors on a Chevy Trailblazer?

Why does my Chevy Cruze shake at idle?

You should also feel the shaking more in gear than when you are in park. It would also feel a little wobbly as the gears are shifted. An engine misfire is the most common cause of a shaking idle, and as the engine stumbles and misfires, that should be seen in the tachometer as a drop in RPM.

What to do when your car is at high idle?

While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly. Step 3 – Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets.

What’s the difference between high idle and low idle?

Step by step automotive repair guide on how to troubleshoot and fix an engine that is idling high (fast) or low (slow). (Note: The engine idle speed is controlled by the computer and is NOT adjustable.)

How can I check the idle air control?

To perform a rough check of the idle air control, remove the valve while reconnecting the wiring harness. While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly.

Why does my trailblazer not go over 3000 rpm?

My Trailblazer has no power and will not go over 3000 rpm. I have replaced the spark plug, gas filter, throttle body acceleration pedal sensor and the crank shaft sensor. I am at a loss of where I go from here.

Why does my Chevy Trailblazer not transfer power?

If your Trailblazer is too low on transmission fluid, it’ll will no longer be able to transfer power to the rear wheels. The power goes to the torque converter, and that’s the end of the line. You should check the transmission fluid immediately.

Why does my 2005 Chevy Trailblazer die at idle?

Clean it thoroughly and then take it on a test drive. Once the idle is re-learned, your problem will be solved. Also the radio control **** to turn channels or volume and on and off won’t work the radio and cd will switch back and forth,, what could could cause this — 2005 trailblazer.

What should idle speed be on Chevy Blazer?

My first test would be with a vacume gauge. If the vacume is good it should hold between 25 and 29 at idle. May be a little low cause of the rough idle, but what your looking for Is for it to drop slowly to well below specs. This checks the catalyst converter it could be clogged.

Why is the spark chain on my trailblazer not working?

The timing chain (or belt) is responsible for keeping the upper valve train synced with the crankshaft. This is vital for spark timing. If the timing is off a little and the engine still runs, the timing belt may have skipped. If it has jumped too much the Trailblazer may not even fire.

What’s the problem with my rough idle car?

May be a bad plug, may be a water problem, but probably a bad coil. Picked up a coil on the way home and got it changed out. Seems fine in the parking lot, will probably take it for a spin around the block after dinner just for peace of mind.

Is there a recall on a 2005 Chevrolet TrailBlazer?

Following hundreds of complaints and a few accidents allegedly caused by the malfunction, the National Highway Traffic Safety Administration (NHTSA) opened an investigation into the issue in May 2011. Unfortunately for frustrated owners, no recall has been announced.

What does the gauge say on a Chevy Trailblazer?

Some report that the gauge says “empty” after a fill-up, while others report the gauge says “full” when they’re running on fumes. Either way, there’s one thing everyone seems to agree on: the darn thing is just wrong.

Why is the radio not working on my 2005 TrailBlazer?

Also the radio control **** to turn channels or volume and on and off won’t work the radio and cd will switch back and forth,, what could could cause this — 2005 trailblazer. You may need a new radio. It would have to checked out to be sure.

How can I increase idle speed in a Chrysler?

If the resistance is outside that range, the idle control motor needs to be replaced. Use a bidirectional scan tool to increase idle speed in a Chrysler. Connect a bidirectional scan tool to the same OBD port you would plug a code scanner into. Use the command in the scan tool to increase the engine’s idle.