Engine STILL Misfiring - Need Help
Teching In
Joined: Jul 2008
Posts: 24
Likes: 0
Have a look and ensure your iat sensor is plugged in. Also if you can get the car logged it will go a long way towards fixing the problem instead of throwing away money replacing perfectly good parts.
I hope you get it sorted.
I hope you get it sorted.
Have you checked your fuse box? My car started to misfire and ran rich a few days ago and it was caused by the MAF fuse blowing. I don't know if those later model engines had a MAF, but perhaps some other short fuse could cause a similar issue? The fact its only on one bank doesn't really help my suggestion, as it would seem the problem would only be connected to that one bank and not the whole engine, but just a cheap suggestion....
Staging Lane
Joined: Apr 2007
Posts: 67
Likes: 0
From: Greenville, SC
200, 200, 195, 185? A 15ps1 difference doesnt sound acceptable to me. But then again you said that was on a cold engine. Considering the pressure drops as you move towards the back of the head, you might consider checking the torque on your head bolts. I think your pressure difference between cylinders is not to be more that 10-14% or something along those lines. Just a thought.
**UPDATE - Problem solved!! Well, I finally found out what the problem was: plugged catalytic converter on the passenger side. I pulled the Y-pipe off, fired the car up and there was no flow at all. Remove the cat, gutted the interior, re-installed and fired it up again. Success!!
This was without-a-doubt, the most frustrating problem I've ever had with a car!! I'm just glad I finally could figure it out!!
This was without-a-doubt, the most frustrating problem I've ever had with a car!! I'm just glad I finally could figure it out!!
200, 200, 195, 185? A 15ps1 difference doesnt sound acceptable to me. But then again you said that was on a cold engine. Considering the pressure drops as you move towards the back of the head, you might consider checking the torque on your head bolts. I think your pressure difference between cylinders is not to be more that 10-14% or something along those lines. Just a thought.
no offense but 10% of 200 is 20 so in saying that 180 would have been acceptable
I have since dyno'd the car - 396 horse, 408 pounds torque. This is still with exhaust manifolds, one cat intact, and non-ported throttle body.
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