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Old 04-11-2006, 09:04 PM   #11
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Quote:
Originally Posted by SSEimatt93
fuel pressure is always lower via gage on the top end,
but i have been told otherwise.
im almost positive its running lean, but the 02 reading via scantool is RICH at WOT
It should be rich at WOT.......... BUTwont a bad O2 tend to read rich when its failing?
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Old 04-11-2006, 11:58 PM   #12
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I should pull that puppy and take a look at..if its anything like John W'*....

Edit:
Just looked at plugs and the 02, they both look perfectly fine.
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Old 04-12-2006, 01:29 AM   #13
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Quote:
Originally Posted by SSEimatt93
I should pull that puppy and take a look at..if its anything like John W'*....

Edit:
Just looked at plugs and the 02, they both look perfectly fine.
you can not allwas tell by looking at an O2 that it is bad, i would suggest that if you have not had it changed within the time you have had the car, then for what its worth you should change it and know 100% that its good

i changed mine last week , the old one looked fine but i notice much better MPG with the new one in
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Old 04-12-2006, 01:37 AM   #14
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ofcourse i have changed my 02 before.
it has about 10,000 kms on it
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Old 04-12-2006, 01:47 AM   #15
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My bet would be you are running lean.
But the other possibility, if the O2 is correct, could be that the extra boost pressure created with the 2.2" is raising the outlet temps to a point where the cooling is not sufficient and the engine knocks and retards.

Are you running with Ethanol enriched fuel?
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Old 04-12-2006, 08:55 AM   #16
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O2 sensors when they get 'tired' tend to READ lean, and over-richen the mix, which is why decreased fuel economy is the first sign of failure most see.

What'* your fuel pressure again at idle with the vac line pulled?
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Old 04-13-2006, 12:26 AM   #17
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vac line removed i do belive it will go to around 48-52 ish
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Old 04-13-2006, 01:34 AM   #18
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That'* about 8 psi lower than I'm running.
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