95 Bonneville random stuttering and bucking - Page 2 - 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 02-01-2009, 09:27 AM   #11
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Thanks for the tips, I will be checking my pvc, coils and wires this afternoon. My stuttering/bucking only occurs under light acceleration on the highway. My idle appears to be fine.

Where is the trans vacuum modulator? I'd like to put my hand pump on it and check it too.

Thanks, Tom

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Old 02-01-2009, 10:07 AM   #12
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Quote:
Originally Posted by tminihan View Post
Thanks for the tips, I will be checking my pvc, coils and wires this afternoon. My stuttering/bucking only occurs under light acceleration on the highway. My idle appears to be fine.

Where is the trans vacuum modulator? I'd like to put my hand pump on it and check it too.

Thanks, Tom
The module is on the trans itself, on the front side. looks like a can with a vacuum line going to the front of it. You can buy an adjustable shift module for around $20 at some of the parts stores. But make sure this is the problem first before you install it.
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Old 02-01-2009, 11:03 AM   #13
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When you guys did plugs, did you change wires? If they aren't good quality wires and don't look new, there is a chance of the wires being bad as well.

Also, please ensure that the #4 and #6 cylinder wires aren't touching the O2 or it'* wiring. That can give the car a case of heartburn. =0)
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Old 02-01-2009, 02:21 PM   #14
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Check coils, plug wires and vacuum modulator. Everything seems ok. The boots connecting the vacuum lines to the press reg, canister and vacuum modulator were all cracked (unsure if before I pulled them or as a result, but they were very brittle) so I will replace those today and continue troubleshooting. Thanks, Tom
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Old 02-02-2009, 06:27 PM   #15
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I replaced my vacuum lines and I still have the same problem. The "bucking" seems to take place at 40mph or above, light acceleration. My guess is transmission, no engine codes. It reminds me when driving a standard transmission and upshifting and accidently skipping two gears (shifting from 2nd to 3rd, accidently going into 5th my missing 3rd). Any suggestions will be helpful. Thanks, Tom
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Old 02-02-2009, 07:00 PM   #16
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Have you checked your crankshaft sensor? Sorry if I asked that already.
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Old 02-02-2009, 08:09 PM   #17
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I have not. Can that be checked or do I just replace it? I think I saw the procedure for replacing in the technical section.
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Old 02-02-2009, 08:17 PM   #18
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I'm writing up a test procedure right now.
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Old 02-02-2009, 08:43 PM   #19
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With the engine cranking, check the voltage from the orange wire to ground on the crankshaft timing sensor and the camshaft reference sensor.

  • Over 7V is satisfactory.


With the ignition switch on, check the voltage drop across the ground circuit (black/light blue wire) on the crankshaft timing sensor and the camshaft reference sensor.

  • A reading below 0.2V is satisfactory.
When using a digital voltmeter to check a crankshaft or camshaft sensor signal, crank the engine a very small amount at a time and observe the voltmeter. The voltmeter reading should cycle from almost 0 volts to a highter voltage of about 5 volts. Since digital voltmeters do not react instantly, it is difficult to see the change in voltmeter reading if the engine is cranked continually.

  • If the voltage does not cycle, sensor replacement is required.

  • Each sensor voltage signal should cycle from low voltage to high voltage as the engine is cranked.
Hope this helps. Kind of whipped this out fast
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Old 02-02-2009, 09:02 PM   #20
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Hi Dan, Thanks for "cranking" the procedure out. I will try it out, hopefully in the next day or two. Do I get to the sensors from the bottom or top side? What is strange is that my symptoms only occur at higher speeds and under lite acceleration. Really feels like a tranny, but my hunches are usually wrong.
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