Running Rough and Backfiring
Thread Starter
Joined: Oct 2004
Posts: 139
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From: Port Orchard, Washington
Running Rough and Backfiring My buddy has a 95 V6 firebird and he has been having issues with it running really rough and backfiring on acceleration. I told him to look in to O2 sensors and replace the plug wires and plugs. He took into a couple of shop and they gave him various answers. One said timing chain and I was wondering if that is possible? Or could it be that his coil packs are crapping out on him?
Joined: Nov 2001
Posts: 10,023
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From: LT1 land...the "409" of the 90s!
Those cars are real tempermental about injecters. We had to clean the injecters in Stephs V6 at 78K miles. They can be real decieving when trying to diagnos 
I had replaced plugs and wires along with two coil packs. Two cylinders where wet and two were dry so it made sense. Then I had my Buddy Sonic clean and flow test the injecters. We found two that were not to bad, two that were half way clogged and two the were not flowing anything at all!
They all cleaned up great. Stuffed them back in the car and it ran better then it ever did...until the fuel pump died
BTW after doing the injecters we got over 26 MPG in town and 34+ on the hiway
I had replaced plugs and wires along with two coil packs. Two cylinders where wet and two were dry so it made sense. Then I had my Buddy Sonic clean and flow test the injecters. We found two that were not to bad, two that were half way clogged and two the were not flowing anything at all!
They all cleaned up great. Stuffed them back in the car and it ran better then it ever did...until the fuel pump died
BTW after doing the injecters we got over 26 MPG in town and 34+ on the hiway
Tell him to floor it and run the crap outta it a few times, might help clean it up some...that's how I fix things, haven't blown a motor up yet...almost, but not quite
TECH Fanatic
Joined: Feb 2002
Posts: 1,209
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From: Monroe, Washington
Originally Posted by silverbullet02
Tell him to floor it and run the crap outta it a few times, might help clean it up some...that's how I fix things, haven't blown a motor up yet...almost, but not quite
It felt like I was driving a new car after getting the injectors cleaned. 
Teching In
Joined: Sep 2005
Posts: 28
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From: Mill Creek
Originally Posted by TwoFast4Lv
Those cars are real tempermental about injecters. We had to clean the injecters in Stephs V6 at 78K miles. They can be real decieving when trying to diagnos
I had replaced plugs and wires along with two coil packs. Two cylinders where wet and two were dry so it made sense. Then I had my Buddy Sonic clean and flow test the injecters. We found two that were not to bad, two that were half way clogged and two the were not flowing anything at all!
They all cleaned up great. Stuffed them back in the car and it ran better then it ever did...until the fuel pump died
BTW after doing the injecters we got over 26 MPG in town and 34+ on the hiway
I had replaced plugs and wires along with two coil packs. Two cylinders where wet and two were dry so it made sense. Then I had my Buddy Sonic clean and flow test the injecters. We found two that were not to bad, two that were half way clogged and two the were not flowing anything at all!
They all cleaned up great. Stuffed them back in the car and it ran better then it ever did...until the fuel pump died
BTW after doing the injecters we got over 26 MPG in town and 34+ on the hiway
