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Cylinder 1 and 2 misfire on 1992 Pontiac Grand Am

Cylinder 1 and 2 are not firing. I have switched coils, new coil housing, checked fuel rail, moved injectors to different cylinders, switched wires on injectors and the misfire stays on cylinders 1 and 2. Car also seems to run rougher after it gets warm. Whats next?

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  • Pontiac Master
  • 14,380 Answers

Check the piston rings,are them plugs oily.

Posted on Oct 26, 2012

  • Cody Hardwick Oct 26, 2012

    The plugs are a little oily but not terrible. Haven't looked at the rings.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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fastboyz
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SOURCE: 99 buick Lesabre

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
later
paul

Posted on Sep 23, 2008

  • 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

chuck943
  • 783 Answers

SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

  • 1 Answer

SOURCE: 2001 Firebird 3.8 misfires

Check your alternator see if you have a drop in voltage on your tack,then it is the problem.I too was a victim of high price tune up and still had a problem with a misfire.and cover your coil pack with a piece of rubber water run of onto your power pack .Another thing is to use a silicone spray on all wires.

Posted on Jun 11, 2009

  • 1 Answer

SOURCE: miss fire on cylinder 1 and 2 coils replaced

have u put a new set off leads on it as mite be brakeing down under pressure

Posted on Jun 25, 2009

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No, a plugged converter would cause the engine not to breathe properly. Too much back pressure would stall the engine or make it run very poorly. It would not be local to any one cylinder-all of them would be affected.

To diagnose a misfire in one cylinder, well, you start at that cylinder. It could be ignition related- the spark plug and spark plug wire for #6, possibly the ignition coil for #6 in the coil pack for the engine. (A v-6 would have 3 coils in the coil pack, one coil for 2 cylinders.) It could also be fuel related, so the fuel injector for cylinder 6 should be considered. And the last reason for a misfire is usually the most expensive repair: low compression in #6. This may be a head gasket problem, or a piston ring problem, or one of the valves for #6 may not be sealing well, causing low compression and the resultant misfire. The engine computer codes a misfire when it senses low power output from that particular cylinder. The misfire causes a lag in crankshaft rotation, and the crankshaft position sensor senses it.

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Misfiring can be cause by ignition coil,spark plugs,wires,engine valve,cylinder compression,
if it's a quad four then crack around the ignition coil. there is 2 coils like 1-4 coil and 2-3 coil
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Misfires can be caused by several things including all the parts you have already replaced as well as faulty ignition coils, faulty injectors, vacuum leaks and engine mechanical problems such as low compression.
With the proper equipment, injector operation can be verified by performing injector balance tests, where the operation of the injectors in the misfiring cylinders is compared to the other cylinders that are not misfiring.
Also, engine mechanical failures such as bad piston rings or leaking/burnt valves can be diagnosed with a simple compression test.
An easy (and very inexpensive ) way to verify ignition coil operation is to swap the coil from the misfiring cylinder(s) with the coil(s) from the cylinder(s) that is(are) not misfiring. Then clear the fault codes and drive the vehicle. If the same cylinders are still misfiring, the coil is not the problem. If the misfire moves to the cylinder that you swapped with - replace the coil.
Sometimes, injectors can also be tested this way, but on most GM V-6 or V-8 engines, this is not practical due to the labor involved in "swapping" injectors.

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I have a 99 grand am SE 2.4 4 cylinder and my problem #2 misfire, repalced spark plugs with AC delco rapid fires, replaced coil packs, replaced coil pack housing, changed spark plug boots, had ignition...


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