95 Bonne mystery problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-20-2010, 01:57 PM   #1
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Default 95 Bonne mystery problem

I will try and keep this as straight forward as I can.

My bonneville has been acting up pretty badly lately. It seems like its a problem that use to be hardly there, and has gotten worse.
It runs/idles well in P or N, but when its put in gear (foot on brake) it fights and stumbles. It accelerates like garbage, but it seems like you can power past it, and most times it will run nice when forced to work hard. As soon as you maintain speeds, it then starts to stumble. When it stumbles and runs funny, the volt gauge starts to flip out, and my lights etc dim out.

We assumed it was electrical, so we tore into the wiring harness, and found/fixed about 6 cracked up wires, and the lights were brighter, but it still ran crappy.

We went it again, and found the leads into the tranny had 2 fully broken off wires out of 4. We fixed those, and now it idles better in gear, but you have to tease it to work. Hit the gas...stumble...let off hit the gas, and hit it again ....stumble.... repeat again.....it drives like a charm......well for a moment..... lol

It feels a lot like when my neutral safety switch was out of wack, but it happens in any gear. It feels like driving a standard, and going from 1st gear right to 3rd, then toughing it out till you get up to speed.

We have checked all 3 coils (5.6x on each for resistance)
The wires are all new (but we re di-electric greased them again anyways)
Checked plugs (smelled gassy but other than that they had a healthy color to them (they were new with the plug wires, with under 1000km on them))
Air filter is clean
Vacuum lines seem good
changed the alt (from my new bonneville one to the one from my 95 olds)
Checked battery wires from battery to starter, all starter wires, and every ground I could find.
Pulled up my carpet to check the ground bus, but short of some light dust under there, there was no signs of wetness or anything bad. I never checked it as a result. Should I? I didn't check the passenger side (there is one there also right?) The passenger door in that car is used like 50 times a year tops.
Tested the TPS and it seems fine.
The maf was cleaned and tested this summer. (when unplugged the car dies)
Switched to a different EGR valve.
I haven't got around to checking fuel pressure, but we did test for vacuum,and it was alright.

I have no check engine light, or any other light for that matter, and I only have a OBD1&2 scanner so I cannot test it myself (damn 95s (>_<)).

Also the battery tests at 12.6v

My power steering pump pully is a little screwed up, and is causing a little noise just in case that might be pertinent information.

I made a post about this like 3 weeks ago, and thought my amp being hooked back up solved it, but it so didn't fix anything except my lack of bass lol.

Thanks in advance for any advice, as this car has fully mounted my last nerve.

(1995 Bonneville SE)
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Old 12-20-2010, 02:51 PM   #2
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It sounds like she'* dumping too much fuel at idle. Is the fuel pressure regulator good? Any fuel come out of the FPR vac line when disconnnected?
How old are the O2 sensors, especially the upstream?
No obstruction in the air delivery system?


I know what you mean about it being on your last nerve. I get that feeling every time I've worked on mine . Guess I just really dislike FWD cars, both wrenching them and driving them. It certainly doesn't help that I have yet to find a parts store that can get me the right parts.

Autozone goobers

O'Rielly boneheads
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Old 12-20-2010, 02:55 PM   #3
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If you have an Autozone in Regina, they should be able to scan it free. Back when I had my '94 Cutlass Supreme ragtop I had to purchase one of those expensive scanners that had the OBD-1 connector, but read OBD-2 data. OBD-1.5 or whatever they called it. You can probably find one of those fairly cheap now on Ebay.
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Old 12-20-2010, 02:59 PM   #4
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This is similar to the one I have:
http://cgi.ebay.com/ebaymotors/NEW-A...item1e6066348b
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Old 12-20-2010, 03:45 PM   #5
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The FPR seems good (untested assumption). It has vacuum. No fuel in the vac line.
The 02 sensors are a good question. The main one (the only one i know about), came attached to the rear manifold of a motor off a 1999 buick something or other when we bought the motor (79,000km). If memory serves me well, we had to switch the 02 sensor back to the one on the motor (that died), from a serious intake leak (bad I know). It was switched with a wrecker one, but switched back when it seemed the same both ways

Amen btw. I been chasing Bonneville ghosts for almost 2 years lol
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Old 12-20-2010, 03:47 PM   #6
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My dads tool guy says he will lend him a scanner for it, but we don't know when that will be.... lol
I know I will scan it and see only that blasted cruise control error >_<!
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Old 12-20-2010, 05:13 PM   #7
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My evil problem scared everyone away :(.

C'mon guys, I was hoping to a have a few new ideas for when i go home. lol
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Old 12-24-2010, 03:17 PM   #8
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Any codes? I had a code for cylinder misfire that drove me nuts to find. I tore apart everything and took about a month till I found the problem. It was the first thing I thought it was but the part was only a year old AC/Delco part. I had a bad wire or two. just thought I would throw this out there.
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Old 12-24-2010, 04:34 PM   #9
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Nope,
Not to say there isn't any, but I haven't got it scanned yet. It runs horrible, but only in gear. It idles pretty well on its own. As soon as you hit anything but P or N it struggles terribly.
The places to scan it are a good drive away from me. I plan to try the local mechanic in our town (I don't like him lol).
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Old 12-24-2010, 05:13 PM   #10
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I would check the fuel pressure at the rail and maybe before hand swap the fuel filter !!
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