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'93 Lightning 10psi doggy? air/fuel??

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Old 08-28-2004, 12:31 AM
Brian460 Brian460 is offline
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'93 Lightning 10psi doggy? air/fuel??

My buddies lightning with a stock motor and a 10psi S-trim on it seems to be doggy sometimes like it has severly retarded timing and then the next stoplight it might run great.

He has an A/F ratio monitor in cab and it is always hanging out in severe lean condition now, even when running boost and 100psi fuel pressure.

It also has a rough idle condition sometimes it will flucuate between 300-1000rpm normally it idles at around 750 rpm.

Could this be the o2 sensor?

If anybody has any ideas that would be great we are out of them
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Old 08-28-2004, 08:36 PM
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Sounds like a bad ground to me. I'd check the fuel pressure regulator too, and then put in 2 O2 sensors (one for his gauge, and one for the computer). It's possible that the computer is not gettin enough signal from the O2 sensor, or feedback from the gauge.
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Old 08-29-2004, 11:38 PM
Brian460 Brian460 is offline
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He has a mechanical fuel pressure gauge on the cowl so we know it is right. Going to replace the o2 sensor.

Where do you think it might have a bad ground?
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