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Old 08-01-2002, 06:34 PM
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Red face Engine miss

I sure hope someone can help me figure out the miss I have in my '95 Sonoma 2.2L five speed.

I have changed plugs, coils, the ECM, plug wires, EGR valve, and the engine still misses when loaded in 3rd, 4th, and 5th gear. It is equipped with the OBDII system and is NOT giving out a code as per a diagnostic tester. It does show a minus 50-60 degrees advance. This could not be possible as I think the engine would not run that way. When I get on the freeway and begin to give it the gas to go fast it is like one or two cylinders begin cutting out. The truck really loses power.

I am at whits end and can't afford to be continuing to change out parts to resolve the problem. HELP!!!!

Please respond directly to me at bcwideopen@aol.com, Thank you.

Bill

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Old 08-01-2002, 07:21 PM
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Well nitro this is a long shot not being familiar with the 2.2 set-up but I've seen similar on some Fords. I think it was the V-6 Windstars the EGR passages in the intake manifold would partially clog so that when the EGR opened it would only hit one or two cylinders and cause them to missfire. We would disconnect and plug the vacuum line to the EGR and test drive to see if condition stopped. If it drove ok with the EGR disconnected we knew it was the passages in the intake. You could try this test (costs nothing), I don't know how the EGR flow is routed on a 2.2 engine. Side note, if you run an OBDII car with the EGR disconnected it can set a code for insuficiant EGR flow. You will have to clear that when done. It's a long shot but thought I'd mention it.
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Old 08-01-2002, 10:06 PM
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Nitro: To me it sounds like it could be injectors getting clogged, and losing fuel pressure as you increase the engine load. Had a similar problem on my 2.2 Dodge Daytona Turbo, and we tracked it down to very dirty injectors, three of which cleaned up with injector solvent cleaner, fed directly into the injector fuel rail. One, didn't clean up, and will have to be replaced. The difference was amazing, even with only three coming clean. So, my suggestion is to try and get the injectors clean.


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Old 08-01-2002, 10:07 PM
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Could be a bad ignition pickup or a loose mount for the pickup.
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Old 08-04-2002, 03:33 AM
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nitro those gm 2.2 have head gasket problems!!! when you first start it does it seem to miss a bit then run ok; if it does you may have a cracked head or a bad head gasket.when was the last time you had the fuel filter replaced, it could be a plugged filter,did you have your fuel pressure checked 35-45 psi and does it have good fuel volume.gm doesnt recommend cleaning there injectors they say it ruins them , by cleaning off the shillack off of the windings and shorting them out.did you check your cat converter it may be plugging up,drop your exhaust to see if the front is starting to melt over. recheck your plug wires by taking 3or 4 table spoons of salt and mixing it with 1 quart of water, then spraying your wires to see if they will spark, ( new just means that they are shinny ) you hve to watch out alot of after market parts are junk, and they some times work worse than the old part that you just took off.
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