95 Bonnie Flat-line while driving - 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 05-19-2009, 09:12 AM   #1
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Default 95 Bonnie Flat-line while driving

The last two days my bonnie has been acting up. It'* a 95 SE with 180k. While driving down the road at highway speeds it will flatline for a split second and then run fine. Everything seems to die, engine, a/c, etc. It lasts for a split second and then everything is normal, without having to restart or anything. It happened in a parking lot once and I had to restart, but usually everything comes back on and the car continues to drive fine until the next event. I have a 15 mile commute and it happens 3-5 times per trip. Any ideas would be helpful. I've checked the ground center by the drivers door under the carpet and everything seem fine.
Thanks, Tom
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Old 05-19-2009, 09:42 AM   #2
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Does the car loose all electrical power or does the engine simply cut out for a moment.

Sure sounds like a crank position sensor to me. I'd suggest checking the pcm connections, battery cable connections before going to the CKP but it'* likely the CKP.
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Old 05-19-2009, 01:24 PM   #3
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I believe it'* the majority of the electrical system. It'* so short that it'* difficult to tell, however, I do hear the warning bell come on (same sound low fuel or low oil level), so that is definitely energized. The a/c blower definitely cuts out. Seems to be random warning lights coming on during the brief outage. I guess those lights come on when starting the car normally. Does that lead to the CKP? Can the CKP be checked or should I just replace it? Is the PCM under the seat or in the engine compartment? What'* amazing is that there'* no warning. In a blink the car is off and then back to normal. The 95 is the OBD transition, so it'* impossible to find a scanner that they lend at the auto stores.
Thanks, Tom
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Old 05-19-2009, 01:51 PM   #4
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the things I'm looking at won't show up on a scanner. Since it happens so frequently...let'* do this..

Next time it happens.. notice if this is the scene.
dinger
car stalls
fan speed slows down considerably because it'* on battery only and not alternator
power steering cuts out temporarily with the engine

If that'* the case..it'* most likely the crank sensor.

the car is basically stalling and restarting on it'* own.
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Old 05-19-2009, 07:15 PM   #5
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What you describe seems to be similar to what I experience. It happens so quick it'* difficult to determine the order of the bell, warning lights, etc. I drove the car home today with no issue. Any special tools required to replace the crank position sensor? I may opt to replace it so I don't get left on the side of the road. Thanks, Tom
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Old 05-20-2009, 08:21 AM   #6
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Only thing to keep in mind that isn't standard...would be the bolts to pull the balancer.

M6 x 1.00 x at least 75-80mm in length. GM gave our balancers the smallest bolts ever and usually you can't find them in puller kits.

I described my car as a hiccup. Happens quick...by the time you notice..it'* recovered. Then your heart needs to recover from seeing the low oil light..lol
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Old 05-20-2009, 09:59 PM   #7
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Hiccup is right on. This morning on the way to work it hiccuped at least ten times. Then on the way home - not at all!

As I've gotten older, I'm less inclined to do my own work - it'* getting much more difficult to pry myself out from underneath the car. Anyway, I spent yesterday at three different auto stores getting the right crank sensor. I went to two different stores today looking for the flywheel tool but no luck. They used to sell those things everywhere, and now nobody has them?
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Old 05-21-2009, 11:18 PM   #8
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Update: I picked up my car after having the crank sensor replace for $190. On the drive home the car hiccuped again and left me on the side of the road - killin' me! All power goes out while driving - clock resets, no lights, bells, no hazards, etc. After sitting for a few minutes it comes back to life. Anyway, ECM next? Thanks, Tom
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Old 05-21-2009, 11:25 PM   #9
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Have you checked the alternator out put, the battery voltage while running and not? How about the battery cables..are they clean and free of corrosion?
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Old 05-22-2009, 12:00 AM   #10
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Battery terminals seem clean. Today, when the car stalled, once I got it restarted, the alternator output was a right at the upper end of the red. Occasionally it would pop up to 13/14 volts and stay for a few minutes and then drop back down. As it sits at my house the battery is at 12.6 volts. Would a faulty pcm make this fluctuate or does this indicate a bad alternator? If I replace the PCM do the new ones come with the PROM or do I need to keep the old prom? Thanks, Tom
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