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

got my self a 'flap'

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Old 06-05-2013, 10:02 PM
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I was getting on the interstate to night, and all of a sudden my exhaust got really deep tone, and sounded like when you put a playing card in the spokes of you bicycle. It was just for a moment and then it went back to normal. Couple miles down the road it did it once again. When you come to a stop, it lugs and have to feed it gas to keep it going. I stopped and had the car towed home.
Old 06-05-2013, 10:03 PM
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Sounds like a clogged cat.
Old 06-05-2013, 10:04 PM
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no cats
Old 06-05-2013, 10:12 PM
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Ahh! That would have been an easy fix, kind of.
Old 06-05-2013, 10:21 PM
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Burnt wires? Bad plugs? Might be ignition related
Old 06-08-2013, 11:46 PM
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Chambered muffler? Could have broken internaly.
Old 06-10-2013, 06:45 PM
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^^no, it has to do my motor. My car won't idle on its own, have to feed it gas to keep it alive. I don't see any wires arcing. All plugs are firing. Tried hooking up my dad's scan tool to it, and it tells me it unresponsive. First time that's happened. The SES light hasn't come on at all during thing ordeal.
Old 06-11-2013, 01:27 PM
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Pull your valve covers and inspect for anything not right.
Old 06-11-2013, 03:10 PM
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Brought the car to my mechanic today, he has Genius 5.0 (correct name)? He can't get access to my computer either O2s, tps, ect. Every time he tries it just freezes his screen. I've never herd of these cars having bad computers. When I got my car dyno tuned, the ding dong crashed my original and had to get another. Could this be a cause?
Old 06-11-2013, 05:23 PM
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Could be very possible pcm related, not often do they go bad but i've heard many times they won't connect etc. /crosses fingers mine connects this weekend lol.
Old 06-11-2013, 11:18 PM
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I have seen sensors fail (internally shorted) that knock out PCM communications. Try unplugging one sensor at a time with the scan tool hooked up. MAF,MAP,TPS,OPTI would be the first ones to look at.
Old 06-13-2013, 09:36 PM
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I don't see how a sensor shorting out would cut off communications to the PCM. If any thing it should be setting off my search engine light but its not
Old 06-14-2013, 07:42 PM
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If the 5 volt reference is shorted to ground it will....then again my memory isn't what it used to be...might be thinking Mopar stuff.
Old 06-17-2013, 03:59 PM
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Well, hooked up the fuel pressure gauge and have absolutely zero pressure with the key turned on. Also, can't get to the data screen for the engine (freezes scanner). But can get access to the transmission and ABS

Checked the schrader valve, it was bent and swapped it out now running from 38-45psi.

Last edited by pillarpod; 06-17-2013 at 09:39 PM. Reason: more info



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