Bonneville Backfires! - 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 01-09-2004, 02:14 AM   #1
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Default Bonneville Backfires!

www.fearthepearl.com/vids/rev.avi

Thats the link to it, i did that today AFTER my Cat was installed, but, it has done that since i bought the car back in May 03. Ive replaced, plugs, wires, MAF, O2, PCV, Air filter, Fuel filter,and it has done nothing
I dont know what to check next!
Ive replaced it all! lol
Also here is an other vid,
ok www.fearthepearl.com/vids/freeway.wmv of me on the freeway BEFOR the new High Flow was installed, the last clip u can really hear it missing..
Now she cranks WOT like a dream!

Videos Courtesy of Jason (BonneMe) thanks!

[/i]
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Old 01-09-2004, 02:31 AM   #2
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Ok Matt. Here we go (and keep in mind this isn't gonna be easy, but we'll get it).
Before Fuddy and Andy get in here and start asking all the other questions:

1. Disconnect the battery for 30 minutes, then pull a fresh set of codes.
2. Buy a $10 stethescope and listen to each of your injectors. Do they sound the same?
3. Pull all 6 plugs and inspect them. Do they all look the same, or is one different?

An update on the condition of your fuel system (filters, etc) and ignition components would be a big help.
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Old 01-09-2004, 02:35 AM   #3
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well, ive tested the coil packs thats about it (ohms) they all were at the minimal OHM reading line.
I will get a Scope tomorrow, and try this.
Also i will reset the pcm and pull the codes with my paperclip!
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Old 01-09-2004, 02:47 AM   #4
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One more thing......I forgot.....does it do this hot, cold, or any time?
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Old 01-09-2004, 03:10 AM   #5
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hot
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Old 01-09-2004, 03:13 AM   #6
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Ok....being temperature sensitve makes me lean towards the electrical/electronic side. This means ignition is alot more likely than fuel (especially in a backfire condition).

I'll wait until all the stuff already mentioned is nailed down (codes, etc), but I have my ideas
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Old 01-09-2004, 03:20 AM   #7
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Quote:
Originally Posted by willwren
I'll wait until all the stuff already mentioned is nailed down (codes, etc), but I have my ideas
Oh i dont doubt you do LOL
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Old 01-09-2004, 09:44 AM   #8
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Might be an ignition timing problem. Possibly crank angle sensor? That was one of the symptoms of mine going bad.
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Old 01-09-2004, 12:32 PM   #9
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Maybe the ICM is going.... Matt you never told it me it was only when it was hot! I think it'* time for a DIS4 wren?
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Old 01-09-2004, 07:58 PM   #10
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well i took the scope to all the injectors, they sound the same, also i un hooked my battery for an hour, and after that no new codes were stored.
So now im outta ideas!
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