Stuck lifter? - Page 11 - 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 04-25-2010, 01:09 AM   #101
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Other then that all I can think of is a bad motor mount.
Last year I decided to change all of my mounts save for the transmission mount, because I was burning through engine torque mounts every month. I must have replaced that thing 5 times last year.

So I replaced the front, which was completely broken. It wasn't just the hydraulic part that had separated, but the metal had torn as well. In the meantime, I also replaced the rear mount. The rear mount had two bolts to the subframe and one bolt to the block, but two bolt holes. I figured it would be fine to put only one back.

So I put only one back, and shortly after, I would hear a clunking noise when going from reverse to drive or back, and I never knew what it was, until recently.

Recently I blew another front engine mount, and I discovered the reason was because the rear engine mount had started to become loose, so the engine was actually angled forward a bit, putting lateral stress on the torque mount. I quickly found a bolt that fit the second hole, pushed the engine back, and replaced the front mount. The engine torque mount is starting to tear, but is not torn yet, so that'* still in good shape. When I took the side cover off to replace the parking pawl rod in January, the transmission mount seemed fine. A few days ago, I checked the front mount and that seemed fine.

Now the only possible explanation would be a broken rear engine mount because of the way it had flexed due to the missing bolt.. However, would this cause as much vibration as I'm getting now?
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Old 04-25-2010, 09:49 AM   #102
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Seeing that I don't know how much vibration your getting, it'* only a guess. But, vibration at idle is a symptom of a bad motor or trans mount.
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Old 04-25-2010, 07:39 PM   #103
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Finished the compression test. All numbers are with throttle wide open.

1: 190
3: 186
5: 190
2: 189
4: 186
6: 190
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Old 04-25-2010, 07:57 PM   #104
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Good numbers.
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Old 04-25-2010, 08:08 PM   #105
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Good numbers.
Are they not a bit too high? What numbers do N/A 3800'* usually get?
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Old 04-25-2010, 08:09 PM   #106
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Not sure what is normal, but even is more important. I have 145-148 on my engine.
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Old 04-25-2010, 10:05 PM   #107
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Not sure what is normal, but even is more important. I have 145-148 on my engine.
Isn't yours a lower compression engine to start with?

That is true, even is more important.
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Old 04-25-2010, 10:14 PM   #108
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Ya, lower compression.
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Old 04-27-2010, 03:18 PM   #109
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Engine torque mount and rear engine mount are both cracked.

That brings me to 5 engine torque mounts, 3 front mounts, and 2 rear mounts for the last 12 months.

I really need to find a way to bolt in a second engine torque mount since mine only came with one.

I'm going to guess that since this caused all of the vibration, that it also caused a lot of false knock.

I discovered this when I put the car in reverse and sat there for a second. I noticed in reverse that the vibration completely went away.
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Old 04-27-2010, 03:21 PM   #110
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I think you need to look at making a beefier mount
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