My 1995 trans am idles good but back fires under load as soon as I let the clutch out.

Asked by GuruHCR76 Jul 17, 2019 at 07:31 PM about the 1995 Pontiac Firebird Trans Am

Question type: Maintenance & Repair

I have a 1995 firebird trans am  5.7 lt1.t56 6 speed.  It only has 120k miles and
when I bought it, it ran pretty damn good. But was told it needed the value seals
replace, so i replaced them. When I was unplugging the plug wires, optisprak,
water temp, etc. I mean I marked everything thing I under plugged. Got the
heads of got the seal changed and put it back together EXACTLY the same way
I took it around. But now I have a new problem the car idles fine (could idle
better but it idles good) but once I put it into first and ease out of the clutch it
starts to back fire, and not one or two back fires, but constantly. And I've been
asked about the values but I've checked them and re set them 4 times now. A
friend told me that it could be the pcm or along those lines because the car has
the egr deleted, bigger injectors,  a mild com cam with liters. And thinks there
was atune one it and if so could the pcm be the source  of my problem? I want
to get the skipshift delete on it as well but just wondering if it's the pcm

2 Answers
26,245

taver91 answered 4 years ago

It may be simpler than you think. Leaking injectors could also be the source of your backfiring. When raw gas is allowed to enter the cylinders (especially at the wrong time), it explodes causing the backfire.

Mark helpful

GuruHCR76 answered 4 years ago

I'll give them I look over, but wouldn't that cause the car to idle like crap ? It only does it once I let the clutch out and it would go any faster than 10mpr with constantly backfiring. But I'll give them a check and see if it helps

Mark helpful

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