Question about 2004 Chevrolet TrailBlazer

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03 Chevy trailblazer 4.2l is misfiring cylinder 3 changed spark plugs still missfires now I'm going to change coil pack if this doesn't fix problem what my next step

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Marvin

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  • Chevrolet Master
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Check the compression on the cylinder, make sure the fuel injector is injecting fuel into the cylinder,

Posted on Jan 06, 2017

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5 Related Answers

Ron szarafinski

  • 217 Answers

SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4

ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Posted on Jan 17, 2009

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Anonymous

  • 819 Answers

SOURCE: I have a 2002 TrailBlazer with the straight

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Posted on Feb 28, 2010

Dan Grant

  • 69 Answers

SOURCE: 99 chevy metro 4 cylinder

white smoke is probably steam,do a compression test on that cylinder,and check for any evidence of a blown head gasket,(oil in water or water in oil)

Posted on Nov 28, 2010

John Paragios

  • 136 Answers

SOURCE: I have a 2001 chevy

Did you replace the ignition wire? If you have replaced the wire litsen for a vacuum leak if your not sure take a can of wd40 and spray it at the intake manifold gasket if starts to run at a higher rpm your problem is here replace the gasket. Missfire codes are not always spark plugs , coils or wirers.

Posted on Aug 14, 2011

dttech

dttech

  • 4803 Answers

SOURCE: My 2000 Ford Expedition 4.6l had a manifold seal blown and was leaking fluid in the sparkplug sockets. Seal replaced and spark plugs changed, now I am having to change coil packs because Im getting mi

Faulty EGR valves do not cause "false" misfire codes. An EGR valve that is not closing properly can cause misfires (and misfire codes) but they are REAL misfires when this happens.

To understand this, you need to understand what a misfire is and what kinds of things can cause them. It is a very LONG list and I do not have the time or space to get into all that here.

You will also need to understand this if you are going to properly diagnose your misfire codes without wasting a whole bunch of money on parts that you do not need. MANY things can cause misfires other than spark plugs and ignition coils.

I do not know what EGR code you are getting, but I will tell you that in the 37 years that I have been diagnosing and repairing cars, there has only been once that I can remember that I have ever replaced an EGR valve on a Ford engine because the valve itself was faulty. Most EGR codes on Fords are caused by either clogged-up EGR ports or a bad DPFE sensor. Every so often you will find a bad EGR control solenoid or a broken vacuum line, but it is extremely rare that the EGR valve itself the cause. With the exception of leaking vacuum lines and on certain engines, clogged EGR ports (Like the 6 individual EGR ports in the 4.2L engine), none of these causes for EGR codes will cause any misfires.

Also, most of the time when people pull the trigger on the ignition coils on the 5.4L and 4.6L engines, all the thing really needs is new spark plug boots. They get contaminated with oil and water and can cause carbon-tracking on the spark plugs and/or arcing into the spark plug wells instead of sending the spark through the spark plug. It is pretty much the same thing as having bad spark plug wires on a conventional ignition system. You don't throw the coil and distributor away on a conventional system because it needs new wires. Neither should you replace a coil on a COP ignition system that just needs a boot. Some auto makers do not make the boots available seperate from the coil. Ford at least had the insight to understand that people cannot afford the cost of replacing all of their coils just because the boots are defective.

Posted on Mar 24, 2012

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2 Answers

2001 chevy cavalier code po303 how to fix it replaced the spark plugs how to fix it it has a rough idle, weak acceleration ce light starts flashing on acceleration and hard to start


change the ignition coil pack common problem p0303 means cylinder 3 misfire and the coil pack are know to go out on these particular models

Apr 07, 2017 | Cars & Trucks

2 Answers

03 chevy trailblazer, hooked up a code scanner and shows multiple random misfires doesn't give specific cylinder. p0300 code. I changed the spark plugs. no help.


Pull the coil plugs when running. One at a time. If the engine gets worse the coil is good. No difference. Most likely the coil is bad. To check it again, swap it with another. Pull the plug on the suspected bad one. If it gets worse, look to wiring at the one that was no deference. Check for power to the plug.

Dec 23, 2016 | 2003 Chevrolet TrailBlazer

1 Answer

Have a misfire in cylinder 6 changed all coil packs all spark plugs stills says cylinder 6 misfire


A misfire could be caused by almost anything, spark--fuel--compression. Did you check for spark at number 6? All electrical components have voltage and ground, if problem on wiring circuit, replacing the component won't fix it.
Also, check for fuel injector pulse--proper fuel pressure and cylinder compression.
I don't know year--make--model, it didn't post for some reason?

May 16, 2016 | Cars & Trucks

2 Answers

P0302 - Cylinder 2 Misfire Detected,what needs to be done.


Fritz, Clear codes, Plugs and coils try switching them around, not using the same cylinder, to see if code changes to different cylinder. this would help diagnose bad coil or plug. See links below for full instruction. I have had this code come up because of a bad/dirty fuel injector also. Last link tells what other reasons code could be thrown.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Chevy Trailblazer misfire DIY diagnosis step one p0301 p0302 p0303 p0304...

Trailblazer P0301 Is the coil bad

P0302 OBD II Trouble Code

May 13, 2016 | 2002 Chevrolet S-10

1 Answer

Misfire #2 cylinder


The code actually means the cylinder is not producing any power.
Could be the plug, injector, coil, or crank sensor. Or a mechanical problem such as a stuck valve.

Jan 12, 2013 | 2002 Chevrolet TrailBlazer

1 Answer

I have a 2001 chevy malibu. I am getting a misfire in cylinder 5. I have changed the coil pack and spark plug, and I am still get a misfire code on cylinder 5.


Did you replace the ignition wire? If you have replaced the wire litsen for a vacuum leak if your not sure take a can of wd40 and spray it at the intake manifold gasket if starts to run at a higher rpm your problem is here replace the gasket. Missfire codes are not always spark plugs , coils or wirers.

Aug 14, 2011 | Chevrolet Chevy Cars & Trucks

1 Answer

I have a 2002 TrailBlazer with the straight 6,diognostic check said #3 cylinder was dead or misfiring, also map sensor showed up. #3 cylinder was misfiring, so to test the coil pack I swapped #3 coil pack...


did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Feb 28, 2010 | 2002 Chevrolet TrailBlazer

3 Answers

Cylinder 3 missfire, changed plugs, wires and fuel injector


misfire only comes from the coil packs.. replace them

Aug 03, 2009 | 2000 Oldsmobile Alero

2 Answers

Misfires and codes PO316, PO306, & PO305 popped up on the diagnostics check. What needs to be fixed based on that?


You will need to replace no 5 and no 6 coil pack and spark plugs. P0316 is random missfire that computer could not detect the cylinder that was causing it,just knew one was missfiring.
Coil packs are common concern on these vehicles. Can get oil leak into the coil pack wells and may also even get moisture into them.
If yours is a 3.9L it may be involved in owner satisfaction program 07M07 or 07N09 in which they will cover them under the program for up to 10yrs or 100000 miles which ever comes first.

Mar 16, 2009 | 2003 Lincoln LS

2 Answers

Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

Dec 31, 2008 | 2003 Ford Explorer

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