98 C5 Procharged Fuel Problems

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Feb 19, 2007 | 10:02 AM

Mezzer

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From: Gardendale Alabama

98 C5 Procharged Fuel Problems

I really need some advice on this matter. I have a 1998 C5 stock motor with a stage II procharger kit with 44lb injectors and supermaxx header system. Besides that everything is stock. Everything is installed no leaks and computer has been programmed using hp tuner.
The car runs so rich that you can't even drive it, and it chocks itself out in a minute or two and flows the plugs out even before it warms up. It has good pressure at all time in the fuel, and the computer has the right injector size. new o2 sensors and maf were installed. It has 44lb accel fuel injectors in it. I am baffled by this and any help would be great needed...
Kenny

Feb 19, 2007 | 10:05 AM

MIKE-C5

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From: San Antonio Texas

St. Jude Donor '05-'06-'08

98 C5

Who tuned your car...............What is your A/F

Feb 19, 2007 | 11:02 AM

Mezzer

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From: Gardendale Alabama

I had a local guy program it in Birmingham at the Dyno shop. He programmed a tt c5 a week before mine. He is the best around town and even he is stumped. we put 2 new upstream o2s in it and he couldn't get a reading from the passanger side o2. But the computer reads a po132 and po152 code that both o2s are working but the engine is running tto rich and i mean way too rich. The car stumbles and can't even idle right and just pours out smoke. fuel pressure is good all around. Could the computer maybe be bad?

Also the A/F ratio is not even reading cause it is below 10.0 to 1...Why this is happening I have no clue

Last edited by Mezzer; Feb 19, 2007 at 11:11 AM.

Feb 19, 2007 | 12:22 PM

AlwaysInBoost

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if you have a way of checking the fuel trims I would start there first. You really should contact the guy that tuned your car for you to reslove the issue, unless the car ran fine and 'all of a sudden' started to act up. if thats the case then its more then likely a mechanical issue and not related to the tune.

did you change anything since you were tuned last?

Feb 19, 2007 | 12:55 PM

LS2BYU

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It would appear your tuner forgot to adjust the injector constant for the larger injectors or that the programmed constant doesn't correlate to the injectors you actually have.

Feb 19, 2007 | 09:31 PM

Mezzer

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From: Gardendale Alabama

problem was corrected today. thanks to all for the help!
I spoke with a couple of people about the 98 computers....since they only interchange with other 98 computer!
WARNING TO ALL 98 cars! The tuner of mine noticed that everything was set right in the computer but someone else had screwed it up before i bought the car. we swapped the computer out for a new stock one programmed it the same way and it worked. car runs great and like a charm. BE CAREFULL with 98 computers. do not use other peoples tunes. THis process has been weird but thank god it was corrected by just getting a new ecm