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92 camaro rs 5.0 tbi car runs but backfires and wont pick up speed right

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Old Jan 21, 2008 | 01:26 PM
  #1  
varney420's Avatar
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92 camaro rs 5.0 tbi car runs but backfires and wont pick up speed right

can any one help me or have any idea? my car backfires and will not pick up speed right any ideas has any body had the same prob and how can i fix it?
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Old Jan 21, 2008 | 02:40 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Is the SES light coming on?
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Old Jan 21, 2008 | 02:51 PM
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Car: 87 Iroc 5.7 /86 Trans am
Engine: 5.7 TPI / 350 carb
Transmission: 700r4
Re: 92 camaro rs 5.0 tbi car runs but backfires and wont pick up speed right

I have seen this happen for different reasons. 1. timing is out of whack 2. fuel pump is weak 3 cat converter is on its last leg.

you may also want to pull the codes as five7kid said to confirm.
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Old Jan 21, 2008 | 09:54 PM
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Re: 92 camaro rs 5.0 tbi car runs but backfires and wont pick up speed right

thanx guys..............will look into that, i have a update on the proble, i messed with the timeing but did not have a light to use, the car does not back fire now runs a lil better, but still with probs, now when i accelerat it has real bad lag out of first but when it goes into second gear it does alot better pickup almost normal, but while im accelerating i noticed the ses light comes on but as soon as i let up off the gas it goes off checked the codes and it is not showing any bad codes any idea should i have it put on a machen and have it checked that way or can the cats cause this thanx
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one other thing i noticed mine has the oh so warnderfull tbi, how hard would it be to chance to carb and a price range would be good im on a low buget, but the main concern is i notice im leakeing fuel right where the injectors are i mean the fuel pressure reaglator is setting it is leaking where it goes into the throtle body thanx

Last edited by varney420; Jan 21, 2008 at 09:58 PM. Reason: Automerged Doublepost
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Old Jan 21, 2008 | 10:32 PM
  #5  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I'd say fix the throttle body leak.

What codes did it have?
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Old Jan 22, 2008 | 12:07 AM
  #6  
varney420's Avatar
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Re: 92 camaro rs 5.0 tbi car runs but backfires and wont pick up speed right

will do that.....................as far as codes it says everything is ok...but like i said the ses light only comes on when i accelrat then when i let up it goes off and the ses light wont come on untile i accelrat again ive only onece got code 33
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Old Jan 22, 2008 | 12:44 PM
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five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Code 33 is not "everything ok". Sounds like you've got a MAP sensor problem to fix.

A MAP sensor fault would cause all of the things you're talking about.
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