Engine misfire... Please help
#22
#23
I say even if a sensor tests ok replace it anyway I had an TPS that worked great half the time the other half not.
Also when cold ok but under hard working conditions not
At a certain age replace all your sensors you are better off
Always save the old sensors as backup label and date them.
Also when cold ok but under hard working conditions not
At a certain age replace all your sensors you are better off
Always save the old sensors as backup label and date them.
#24
#25
The IAC is a stepper motor, does not contain a spring. If you shut the truck off and remove the IAC, it should be retracted a small amount.
#27
Yea my IAC fully extended to the tip as far as it goes, I pushed it down gently to clean out the carbon Inside with carb cleaner. Pulled out some small bits but didn't feel any difference, still idles rough and misfires every now and again. I guess I'll try changing it out if it's not suppose to be that way, see how it runs after
#28
I learned the hard way you are not supposed to push or pull on the pintle shaft of the IAC. Try a new one and drive the truck a few miles to let the PCM adjust to the new IAC. I had a problem with my truck a couple months ago where it would not idle on a cold start and would try to bog down and die when coasting up to a stop. I installed the old OEM IAC that came with my V8 throttle body and it has been idling fine ever since.
Jimmy
Jimmy
#29
Join Date: Apr 2007
Location: Near Sacramento,ca
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If you were having an injector problem, you would have gotten a P0201 and P0203 injector codes. That would also cause misfire codes too. Are you loosing coolant? Because if you are, you could have a head gasket problem. The most likely problem and I know you will not believe me, is the cylinder head. If you have more than 75k on the engine. Replace both cylinder heads, and if you do replace the heads. Don't remove the distributer, Because you will loose your sync timing.
#30
If you were having an injector problem, you would have gotten a P0201 and P0203 injector codes. That would also cause misfire codes too. Are you loosing coolant? Because if you are, you could have a head gasket problem. The most likely problem and I know you will not believe me, is the cylinder head. If you have more than 75k on the engine. Replace both cylinder heads, and if you do replace the heads. Don't remove the distributer, Because you will loose your sync timing.