got some new codes...can you help? - Page 11 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-19-2008, 05:34 PM   #101
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i still need help guys....please repost asap!
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Old 05-19-2008, 05:41 PM   #102
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I see lots of input back a few posts from members, but do not see where any/all were tried and what the results were. Did you investigate the pressure drop or other things?
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Old 05-19-2008, 11:51 PM   #103
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just to recap what has been done.....

this is was happed when it was scanned...

LT Fuel Trim - 131
LT CL - 16
ST Fuel Trim - 128
MAF - 1300-1450
O2S - 600-650
O2 Crosscnts 48-52
20 degrees of timing
TPS - .035

Holding at 3000RPM

LT Fuel Trim - 110
LT CL - 13
ST Fuel Trim - 92
MAF - 7000-7300
O2S - 879-884
O2 Crosscnts - 0
31 degrees of timing

TPS fully opened 4.10

this is all the work that has been done on this problem alone....

1. clean ground bus (near each door)
2. replaced o2 sensor
3. replaced MAF
4. cleaned ground (g100)
5. checked for lose wiring and/or grounds.
6. checked voltage of MAF. (got 3v)
7. replaced ECM.
8. checked fuel pressure (waiting on someone to tell us if its good or bad)
9. Checked by 2 different shops that could not figure it out...coils were fine and cleaned.
10. cat is less then a year old.
11. fuel filter is less then a year old.

FAILED EMISSIONS...............

here are the test results....

HC..................2.5280 Grams/Mile.........................Fail
CO..................46.4871 Grams/mile......................Fail
NOx................0.0698 Grams/Mile........................Pass
gas cap............................................... .................Pass


let me know what other info you guys my need....i am now driving my car with expired plates......
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Old 05-20-2008, 11:39 AM   #104
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There was a reply about voltage drop. Would I be able to see voltage drop on the scanner, or is this only able to be tested at the pump? When I did the scan I noticed right around 13V but did not look when I was holding 3K rpm. I also still need a confirmation on the mixed replies on the fuel pressure. What is considered to be too low on a stock boosted 93?
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