Bunch of work done, now more issues! - 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 08-25-2009, 01:06 AM   #1
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Default Bunch of work done, now more issues!

OK. I just spent 3 days doing the valve cover gaskets and supercharger coupler. While the SC was off I replaced the intake manifold gasket because the old one fell apart. Put everything back together, 2 or 3 turnovers and it starts up. SUCCESS!!!!!!!

Or is it...here'* what'* happening now. (FYI The engine seems to be running great, not missing, and accelerates/revs up smoothly)

First issue: at idle when RPMs are under 1000 I get this sort of whining sound, maybe grinding sound it'* hard to tell. But right as I hear it the car starts to vibrate. Sound and vibration go away when I give a little gas. NOTE: I'm told main bearings are worn, but I've known that for a while now and it'* never made that sound. Any ideas?

Second AND MOST IMPORTANT issue: Now while driving, when the car upshifts or I take my foot off the gas the car jolts violently. Any ideas?? I'm thinking a sensor.

Observations: Takes a long time for rpms to settle below 1000 when I rev it, it seems to hover at 1200 for a while, then suddenly drops to 800 or so, then that sounds starts happening.
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Old 08-25-2009, 01:13 AM   #2
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First, check for vacuum leaks. Then check over your motor and trans mounts.
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Old 08-25-2009, 01:12 PM   #3
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Check your hose that connects to your transmission shift control module towards the front of the transmission. When I took off my SC the hose was cracked and needed to be replaced. Good luck and let us know.
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Old 08-25-2009, 01:17 PM   #4
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Did you put a new gasket under your SC air vac block on your SC mine was bad and alot of vaccum pressure was leaking here at this part. I used GM gasket maker to make a new gasket to seal up the leaks. Well I hope this helps out.
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Old 08-25-2009, 08:34 PM   #5
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Hmmmm. Is that the black box thing on top of the SC near the throttle body that has the big tube and all the other little ones going into it and has that one long screw with a washer? That needs a gasket, huh?

I'm in the process right now of replacing a lot of the rubber connections.

Here'* something I found. On that circular thing in the front of the SC near the throttle body, on the right side there seems to be a vacuum hose with nothing attached to it. Here'* a pic. Should it be like that?

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Old 08-25-2009, 09:14 PM   #6
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Yes that is to be like that it needs to have a sponge attached to it like an air filter. Yes the big black block with the bolt running through it yes it needs to have a gasket under it or just GM gasket maker under it to make your own like I did.

Last edited by trixster68; 08-25-2009 at 09:15 PM. Reason: added stuff
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Old 08-25-2009, 09:20 PM   #7
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Rockauto.com
ACDELCO Part # 21913 More Info {#00801528, 801528}
FILTER,SPCHG BYPASS
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Old 08-25-2009, 09:39 PM   #8
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Your right I can see the remains of a sponge there on that clip. It'* not too bad if I leave it without a sponge for a little bit is it?

The black box gasket seems like it could be my problem, because I think I have a vacuum problem.

Is there a torque setting for that black box? Also is there a torque setting for the bolt that holds in the bar with the 3 vacuum hoses going off of it (front of SC)

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Old 08-25-2009, 10:37 PM   #9
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Just replaced all rubber connections and put a gasket on the black box. Car shifts nicely and idles steady! It worked!!! Thanks so much for your help.
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Old 08-25-2009, 10:40 PM   #10
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Glad to help enjoy!
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