LT1-LT4 Modifications 1993-97 Gen II Small Block V8

serious fuel problem

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Old 06-22-2007, 03:26 AM
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Default serious fuel problem

ill be driving and it will get really rich out of nowhere. My check engine light will flicker on and off. IDk but i noticed my low coolant on too. IT pops like crazy shooting fireballs. I cant really move anywhere. So ill turn it off and back on. IT will be fine for about for 5 seconds and go back to being rich but if i like ''downshift and floor it'' past 3k it will fix itself..WEIRD, whats going on


also, this is random. IT'll happen one night today and not for another week
Old 06-22-2007, 03:30 AM
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I would guess o2 sensors, since it doesn't happen at wot.
Old 06-22-2007, 03:33 AM
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btw i get 6mpg when it happens
Old 06-22-2007, 03:33 AM
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that's another symptom of o2 sensors.
Old 06-22-2007, 03:44 AM
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I was going to say that, but I just couldn't imagine them because of the fact that he can barely drive when it happens, and it's so random/rare. My pass side is bad but it's lean, not rich :\ I suppose they CAN die at lean or rich.
Old 06-22-2007, 03:54 AM
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Originally Posted by Formula350
I was going to say that, but I just couldn't imagine them because of the fact that he can barely drive when it happens, and it's so random/rare. My pass side is bad but it's lean, not rich :\ I suppose they CAN die at lean or rich.
If they're really bad, they can do wacky things. The guy I bought my current car from had that happen. Said it was sputtering and misfiring really bad. He unplugged the o2 sensors and that went away.
Old 06-22-2007, 04:00 AM
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i dont have rear 02 sensors. i dont have cats. so i guess im stuck buying new ones?
Old 06-22-2007, 04:02 AM
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Originally Posted by razorclaw99
i dont have rear 02 sensors. i dont have cats. so i guess im stuck buying new ones?
no, I mean the front ones. They are are the ones that control fuel. Rear O2s have nothing to do with it.
Old 06-22-2007, 04:02 AM
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lol so just unplug my fronts??
Old 06-22-2007, 04:05 AM
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well no, you should replace them (if that is the problem).

You can test it by doing that though. If you unplug them and the problem goes away then you know that is the issue and you should replace them. If you still have the problem then it's not the o2s but something else.
Old 06-22-2007, 04:06 AM
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what if i jsut leave them unplugged? it will definetly **** up my tune right?
Old 06-22-2007, 04:07 AM
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It won't alter your tune but leaving them unplugged will just cause it to run in open loop and your gas mileage will suck.



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