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

Backfirering when shifting

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Old May 8, 2007 | 12:47 AM
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Default Backfirering when shifting

Alright it seems like whenever I shift at a higher RPM, my car basically backfires a little bit. Now I have talked to some people and some said that it is normal for that type of engine, yet at couple of people (a good friend and a mechanic) suggest that I could have a valve problem. So I was wondering if backfirering, when shifting, was normal or do i actually have a problem. Also if it is normal, could someone kind of explain to me why it is normal so I can explain it to the other people when I talk to them. Thank you very much.
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Old May 8, 2007 | 01:00 AM
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running lean, EGR sticking, bad plugs, bad wires, bent valve, could be many things.

i solved my problem today. bad plugs.
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Old May 8, 2007 | 01:07 AM
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ok so it isn't something that is normal? crap, well my plugs and wires are new so that shouldn't be the problem. I am really hoping that my valve isn't bent because that will really suck.
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Old May 8, 2007 | 01:13 AM
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Would suck...and then some...
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Old May 8, 2007 | 01:13 AM
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Oh yea, how old is your fuel filter?
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Old May 8, 2007 | 01:15 AM
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the fuel filter is pretty new also
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Old May 8, 2007 | 01:21 AM
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Hmmm...check your fuel pressure, it is a good place to start.
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Old May 8, 2007 | 01:24 AM
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yea my buddy and i checked that and it seemed a little on the low side. we are going to tape the gauge to the winshield and take her out for a spin to see if it drops when driving. could a bad fuel pressure regulator be the problem?
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Old May 8, 2007 | 01:28 AM
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Man, there are a number of things, just test it and go from there, i say you might have a weak pump possibly, i have seen many a LT1 pumps weak, but not enough to keep it from running. So do as you plan and go from there.
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Old May 8, 2007 | 02:02 AM
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i had an exhaust leak form the egr hook up on the exhaust manifold. caused something similar at WOT
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Old May 8, 2007 | 11:02 AM
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yea i just put in headers and the stock manifolds were in such bad condition, i actually had a leak from them. It never backfires at WOT only when im shifting. the car runs fine when im accelorating but as soon as i shift at a higher rpm, there is a small backfire or pop.
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Old May 8, 2007 | 11:05 AM
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LT1's do that, expecially when you put Headers on them and open up the Exhaust.. Mine even did it and it was a Auto.. my friends M6 does it all the time, and we are both tuned a hair rich.
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Old May 8, 2007 | 12:18 PM
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my friend has a 2001 Camaro SS M6 and his car didnt do that until he had his GMMG cat back exhaust installed it backfires a little when he shifts at red line. car has 60,000 miles on it.
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