Quote:
Originally Posted by upallnight
Sounds like you been just throwing parts at it hoping it will fix the problem. A misfire is interpreted by the ECU as a cylinder that is not producing the same amount of power as the other cylinders. How can a computer determine this? By noting the rpm of the engine. A lean cylinder could also be interpret by the computer as a misfire. Before throwing more parts at it, you need to perform or have perform a good diagnostic of the engine.
What was the reason for replacing the thermostat? Was it stuck in the open or closed position? You said that you checked the compression? What were the readings? If they are not with in 10% of one another that could be your problem.
You say that this has been going on for 9 month, but it only started after you replaced the thermostat last week. I'm confused????
Do you have a Check engine light on? If you do what was the trouble code?
If you had a rich or misfire condition for the pass 9 months and just ignored it, your cats could be toast. You need to post some more info in order for people to help you.
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Upallnight, thanks for the reply. We have chatted about this in the past.
To clarify some things. Original, in January the thermostat stuck open, I replaced it then, a couple weeks after the replacement is when I started getting the misfires. Last week I replaced the thermostat again thinking that since it was an off brand it might be giving bad info to the ECU.
Yes I get a check engine light with these codes; P1351,P0304, P0302, P0306, P0303, P0301, P1345, P1342. P1349,
I understand that the cats could be failing but Im not replacing them until I get the misfires fixed.
Compression test reviled 165 psi cyl 1-4, 160 psi 5 & 6.