1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Back firing

Old 02-11-2007, 02:09 PM
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Default Back firing

my car hasnt ran in 4 months, its fixed now but it runs ruff and it was back firing today
and has lack off power, Its a 93, and it ran good b4 it stoped runing, it had a wiring problem, its got a new cam and crank sensors, now,
and the throttle position senser is only 1 year old, i tryed to clean the MAF out but it did not help, and the spark plug wire is not on the O2 senser,
Any ideas

Old 02-11-2007, 02:25 PM
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Have you changed the spark plugs yet? How about wires?

And did you check the resistance of the coils?
Old 02-11-2007, 09:14 PM
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Spark plugs and wires are about a year old, plugs looked good when i pulled them,

Coils are all old, but tested good when i was trying to fix the last problem,
same with my back up coils, but i will retest,

it only doe'* it when the car is cold, but when i first start it up it runs varry good for like 1 min then it starts runing bad, till it warms up, and after it warms up its ok with a big lack of power,

i was thinking its going into limp mode or something, but the cam and crank sensors or new
Old 02-11-2007, 09:30 PM
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Sounds like a vacuum leak.
Old 02-11-2007, 10:50 PM
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if it hasn't run in 4 months, then the fuel has probably been sitting there in the tank not being used, and now the car is being run on really old gas. gasoline only has a shelf-life of about 28 days, so it could just be bad gas
Old 02-12-2007, 02:03 AM
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'''Sounds like a vacuum leak, '''.... I hope not, i hate vacuum leaks!!!

'''the car is being run on really old gas'''... I ran about a new full tank by now, and it was on E when i got it back.

this car has 85,600 but its stuck on that, The car sat for 8 years B4 i got it from the 1st owner,its a 93,... 85,600 is what it had when i got it, i put maybe 40,000, on it but idk its stuck on that.

So far...
I had to put new brake lines on, thay were all bad from seting in the grass for so long....
I had to swiched out the ICM,
new master cylinder
Put in a used Rack-and-Pinion Steering, {not fun}
2 tune up'* {no O2}
new TPS,cam, crank, and MAF sensors
new EGR
new Cat and muffler
then a bad cam sensor wire
new barring
The tran had no fluid in it when i got it, and has had a small wine at low speeds, but shifts good, still does
TCS and ABS never worked.....

Im gona get some new plugs and wires. and do my best to look for a vacuum leak.

Today when i was swiching the Coils out i snaped one on the nuts on the plate that the ICM sets on..but it still runs,,what is that plate called, its not in my book
Old 02-12-2007, 02:10 AM
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You should really fix the odometer. They're very simple.


"Today when i was swiching the Coils out i snaped one on the nuts on the plate that the ICM sets on..but it still runs,,what is that plate called, its not in my book"

Let me think about this.... I have no idea what it'* called, But it'* going to be a junkyard part anyway.
Old 02-13-2007, 08:37 PM
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Originally Posted by Damemorder
You should really fix the odometer. They're very simple.
plz, do tell
Old 02-13-2007, 09:56 PM
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sounds like mine did when the plugs and wires were crappy, and then again when a coil went, and then AGAIN when my MAF sensor crapped out. Although if it was your MAF you should be getting a Check Engine light, at least mine was.

I agree that it sounds like a vacum leak

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