Need help BAD
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Teching In
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From: Lexington, south carolina
Need help BAD ok so here it goes, i have an lt-1 trans am 96. my car started to randomly hesitate and backfire and run like ****. so i wanted to put a better motor in it anyway so, i put a rebuilt 355 lt-1 in it (completely different motor) with lt-4 hotcam, i replaced opti, new wires, new plugs, new gaskets. so i get it done and fire it up AND STILL RUNS LIKE CRAP... wtf is the problem. i got my buddy to tune it and it was like the computer wouldnt take the tune. he got it perfect then it ran rich and the plugs screwed up. so it runs fine when you replace the plugs then it runs so rich that the plugs go bad. i dont know what to do i am running out of money to dump in this thing and i just want my car back does ANYBODY know whats up with my car. i would GREATLY appricate it. i am going to try to take my buddys computer out of his 97 t/a and put it in mine to see if its even the problem. please help
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From: Decatur, TN (N-W of Athens)
Rear O2 won't cause that.
Forgot about the MAF. Unplug it, see if the car runs fine. It'll fall back on it's Speed Density (MAP) tables, which is a quick and easy way to tell if a MAF is bad. Also, don't bother descreening it. Doesn't help any, and if somehow something from the filter got through and collided with the MAF sensor's sensitive parts, it'd toast it out.
Forgot about the MAF. Unplug it, see if the car runs fine. It'll fall back on it's Speed Density (MAP) tables, which is a quick and easy way to tell if a MAF is bad. Also, don't bother descreening it. Doesn't help any, and if somehow something from the filter got through and collided with the MAF sensor's sensitive parts, it'd toast it out.
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Thread Starter
Teching In
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From: Lexington, south carolina
this is insane know one knows whats going on with it... EVERY shop in town has no clue. i would pay like good money for someone to figure this crap out. i searched all over the internet and lots of people have this problem but no one has any answers.
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Verdad Gallardo Well you need to know what other DTC's are present. You can have all the DTC's set and the engine light is on. You don't know what's going on just because the light is on. You need to hook it up to a scanner to get the DTC's and watch engine parameters in real time.
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From: Decatur, TN (N-W of Athens)
You haven't answered us with what happens when you unplug the MAF (Mass Air Flow). It's mid air intake with a big flat plug, can't miss it lol.
If no shop an figure it out, then the people working there are idiots. The should be hooking up a scanner to see what current codes are and what past ones are.
If no shop an figure it out, then the people working there are idiots. The should be hooking up a scanner to see what current codes are and what past ones are.
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Teching In
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From: Lexington, south carolina
he has already put a different MAF sensor on it. and it ran the same. we have put it on the dyno and used hp tuners and its like the computer wont take it.
a walkthourgh of what we did
changed the plugs
dynoed it
tunned it till it was perfect
then dynoed it again and we were crusing at like 55 then it just started to stubble and run like crap.
i dont know i think its hopeless. cause now i have no compression to cyl. 4. and when you pull the plug out it looks a little worst than the rest.
a walkthourgh of what we did
changed the plugs
dynoed it
tunned it till it was perfect
then dynoed it again and we were crusing at like 55 then it just started to stubble and run like crap.
i dont know i think its hopeless. cause now i have no compression to cyl. 4. and when you pull the plug out it looks a little worst than the rest.
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From: North Versailles, PA
It was prob the front o2's the whole time. Sounds like what happened to me. Try replaceing them and see what happens. I'd put money on it since everything else seems fine from what you say.
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From: Decatur, TN (N-W of Athens)
Do the plugs. Just make sure they're the right heat range and gapped correctly. One guy on here said that .040 made his car run like ***, but .035 was perfect.
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Teching In
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From: Lexington, south carolina
ok so i finally figured out the problem. i have seen alot of people on the fourms and everywhere on the internet that have had this same problem but know one knows how to fix it. but when they do know how to fix it they dont reply and say how. so i wanted to come on here and tell everybody what went down...... so it was the computer and i guess it was just time for it to go. and who ever said front o2s THANKS i wouldnt have even thought about that, they were bad also. so it runs beautiful, so smooth. but thanks for the help guys.
Originally Posted by 19t/a96lt1
ok so i finally figured out the problem. i have seen alot of people on the fourms and everywhere on the internet that have had this same problem but know one knows how to fix it. but when they do know how to fix it they dont reply and say how. so i wanted to come on here and tell everybody what went down...... so it was the computer and i guess it was just time for it to go. and who ever said front o2s THANKS i wouldnt have even thought about that, they were bad also. so it runs beautiful, so smooth. but thanks for the help guys.
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Teching In
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From: Lexington, south carolina
well we swapped out the computers with another t/a and it ran decent then we changed the o2s and it ran great so it was more like a leap of faith hahaha.