Backfiring when starting, will barely run - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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.

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Old 11-27-2007, 09:22 PM   #1
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Default Backfiring when starting, will barely run

Hi Guys new to the site and heres my first problem. the cars a 93 SSE. When trying to start it, its starts backfiring seemingly through the intake. The car wont run unless you have your foot on the gas. The battery seems questionable so tomorrow I am going to get another. The car was running fine when I last parked it. Went to start it to go to work and thats when this started. I have done some searches but I have not found anyone that has/had a similar issue. Please help!
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Old 11-27-2007, 09:45 PM   #2
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Water in fuel or vac leak are many of the possibilities. Did it throw any codes?
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Old 11-27-2007, 10:12 PM   #3
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No, no codes. That whats sucks. The battery has been giving me some issues though. The charger says it has a bad cell. It seems unlikely, but i've seen weirder things happen. It is safe to presume that the cam and crank sensors are OK simply because it will run? What about the coils and ignition module?

If it is a vac leak, how can I find it while the car is barely running??

Thanks.....
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Old 11-27-2007, 10:18 PM   #4
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my first guess would be the icm

but how many miles?
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Old 11-27-2007, 10:22 PM   #5
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cars got about 170k. Bought it brand spankin new. The only real problem with the car was the tranny at about 100k. I checked the local yard today thinking the same thing and they will sell me an icm with the coils for $75. Sound OK?

I'd really like to give the car to my mom for the winter(just the winter), as she currently has a SSR and I can only imagine how that will handle New England weather.
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Old 11-28-2007, 11:49 AM   #6
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A bad battery, or cable connection / ground could be causing the problem. The first thing you check next is all the electrical sensor and Icm connectors, I have even seen a dirty computer harness pin cause this. The possibilities are endless.
Do you have an Ohm meter to check the coils, or check for spark at each cylinder.
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Old 11-28-2007, 09:20 PM   #7
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Dam crazy I tell you. I put a ICM out of another running car and now its doing something different. Now as soon as the engine fires off, it races to 3000 rpm and them dies flat. Try to restart in and the same thing happens again???????
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Old 11-28-2007, 09:22 PM   #8
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Quote:
Originally Posted by chuckt
Dam crazy I tell you. I put a ICM out of another running car and now its doing something different. Now as soon as the engine fires off, it races to 3000 rom and them dies flat. Try to restart in and the same thing happens again???????
??? idk , that weird. and it came from a car u seen run? or a yard said it ran?
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Old 11-28-2007, 09:25 PM   #9
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I didnt actually see the car run.........even so I, a defferent issue?
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Old 11-28-2007, 09:37 PM   #10
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Sounds like you may need it scanned while running to see whats going on. Or you may just have another bad ICM or coil. I assume it did not backfire this time?
Also try this: remove the idle air control valve and clean it as well as the MAF. Because you did backfire you should also check the operation of the TPS and that the voltage is set correctly.
Guess unless it is scanned you are going to go through a lot of trial and error.
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