Quote:
Originally Posted by steve99
It seems a bit suspect that it ran fine till you refueled it.
Then it runs crap tgrows lean cel codes and one of your pictures shows +20 % fuel trims.
Im just guessing here but either you have an exhaust or intake leak. They usually snd fuel trims positive
It possiblle car has some weird tune in it as lots of these car tuned. If it was tuned for e85 id expect big negitive fuel trims if you put petrol in it.
Idle vaccum should be about 10 psi below atmospheric ie atomspheric is 14 psi so idle manifold pressure should ve about 4 psi unless its got a leak.
If fuel trims are high at low rom and idle but ok once you get to 3000 rpm or so its likely exhaust leak if idle vaccum was ok
It might have some tune for turbo or supercharger and they pulled it off
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Thanks for in the insight Steve! Certainly appreciate it.
I will try and get the car idling some-what solid and check the manifold pressure.
Regarding the fuel trims, I think the screen captures may be a little deceiving as they were all over the place while I took the picture, I think maybe because the engine speed was not consistent and a couple of time sit would drop really low, to like 300-400 rpm and then spike back up to 1300. There is another insistence within 15 seconds where the fuel trims are actually negative if I am not mistaking.
For a tune/super/turbo charger, I am about 99.9% certain this car has never had anything done do it, possibly not even regular service. I am basing this from the condition of the interior as well as the contents left behind in the trunk of the vehicle when I got it:
1) numerous women's clothing items, including a very large set of ...uh..what I hope.. were somewhat clean underwear, lotions, etc
2) beach-going stuff for a child, along with many other small childrens toys
3) the vehicle was wrecked and surrendered to insurance right after, there definitely was nothing taken off in the shape of a turbo due to the fact that I have removed various shapes and sizes of remains of the factory intake box/pipe etc.
I am going to get some compression numbers (at least on the troublesome cylinder 3 ) this evening after work to see if I can rule that out. If that checks out I will proceed to look for a vacuum leak until the fuel injector ecu shows up as aside from that I am simply lost to what the issue could be.
Thanks again for all the input. I'll follow up as soon as I have any more results or information to share.