Slow car, strange fuel trims?
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Joined: Jan 2007
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From: Northeast
Slow car, strange fuel trims?
Recently my car has been acting strange...
Sometimes the car is fine, and feels great! However, most of the time it is slower than what I would say is normal. One thing that it does is sometimes it has NO power at all, I could have it WOT the turbo will spool, but no power at all...
The boost will spike to like 16psi, then slowly work its way to 20psi, and sometimes it is the other way around...(although it isn't always obvious or noticable) When it rains hard it is REALLY bad, no idea why...
Anyways....I am guessing it is a boost/vacuum leak, I think it is specifically the TB seals, although I can't tell for sure as I have no way to test it.
One thing that I did was log my STFT at idle, as well as at different RPMs and it was all over the place, and was told that the way it was acting is a sign of a vacuum leak!
I just want to see what you guys think....I will post a graph that shows STFT Vs. RPM
and if you want I can post the log too...
Sometimes the car is fine, and feels great! However, most of the time it is slower than what I would say is normal. One thing that it does is sometimes it has NO power at all, I could have it WOT the turbo will spool, but no power at all...
The boost will spike to like 16psi, then slowly work its way to 20psi, and sometimes it is the other way around...(although it isn't always obvious or noticable) When it rains hard it is REALLY bad, no idea why...
Anyways....I am guessing it is a boost/vacuum leak, I think it is specifically the TB seals, although I can't tell for sure as I have no way to test it.
One thing that I did was log my STFT at idle, as well as at different RPMs and it was all over the place, and was told that the way it was acting is a sign of a vacuum leak!
I just want to see what you guys think....I will post a graph that shows STFT Vs. RPM
and if you want I can post the log too...
Last edited by chriseacrett; May 8, 2008 at 07:06 PM.
99% of the replies to this will be "do a boost leak test"
Thread Starter
Newbie
Joined: Jan 2007
Posts: 33
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From: Northeast
Yeah, I do plan to...I took some of my piping out to check things out and some of the clamps were on at a slight angle, put everything back together and the car seems better. The boost is higher too....
But I wanted to just to see if people thought that the chart showed possible vacuum leak, because I have been told that it could also be a bad injector. So even if I do have a leak, I could still have a bad injector....just wondering as I am not an expert...
But I wanted to just to see if people thought that the chart showed possible vacuum leak, because I have been told that it could also be a bad injector. So even if I do have a leak, I could still have a bad injector....just wondering as I am not an expert...
Thread Starter
Newbie
Joined: Jan 2007
Posts: 33
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From: Northeast
Well I did a boost leak test, found a leak. Where the UICP connects to the FMIC was leaking, tightened it up and it stopped leaking there, although the TB leaks out of the shaft, so I am going to order some seals from WORKS and that should hopefully fix everything! It still does it a little, but not as bad so hopefully replacing those seals should do the tricks! Thanks for the help...
Oh and the UICP where it connects to the intercooler is slightly oval, is that supposed to be?
Oh and the UICP where it connects to the intercooler is slightly oval, is that supposed to be?
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