Clanking and idle problem HELP!! - 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 03-10-2009, 03:47 AM   #1
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Default Clanking and idle problem HELP!!

I have a 1999 ssei i purchased about a month ago with 108k on it. It ran fine for a couple of weeks and after laying down rubber through a few stoplights i noticed a misfire. The engine would drop a couple hundred rps, lurch and then start a normal idle again. I didnt think much of it. Now that I have taken on a few more civics the problem is very much so noticeably worst. It only does this in idle, doesn't ever miss when accelerating, and it only does it when the engine is hot. If i drive it very gingerly (under 2k rpm) it hardly ever does this but if i dog it through a couple lights and have to stop it is a very rough idle. Along with this is a sloppy metal on metal sound. Sounds mechanical. Could the two be related? Any help would be appreciated.
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Old 03-10-2009, 08:11 AM   #2
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When you have the car running, where is the oil pressure at? is it below 30 psi?
It could be couple things going on. Could be upper cylinder slap, valve train slap, or stretched out drive chain in the transmission. I hope its not lower end noise from spun main bearing or rod bearing.

Check your oil pressure and get back to us.

Do you have a way of recording the sound and posting it so we can hear it?

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Old 03-10-2009, 08:13 AM   #3
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Does it sound a bit like this?



If so, pull the supercharger belt and do this.


If you have play, your coupler is shot.

There'* a write up in the tech info about changing the coupler.
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Old 03-10-2009, 08:16 AM   #4
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good call Dan! He described to me what I went through twice. hence my '3 motor club'
hope its just his coupler
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Old 03-10-2009, 04:39 PM   #5
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Yes that sound could very well be it. The oil pressure is fine. 60+ at idle with one step heavier oil. I think I'm gonna go back to spec with that. I noticed the slapping sound was more noticible yesterday when the idle was missing, but today I drove it hard for a good half hour and couldn't reproduce the idle miss...odd. The slapping sound is still there but it isn't as alarming as when the idle is missing. I pulled wires for each cylinder today and it ran noticeably smoother with #2 pulled (smoother than when i pulled each of the other wires not as smooth as with no wires pulled). Any ideas? simple tests?
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Old 03-10-2009, 04:41 PM   #6
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And thanx for the help guys. I have been lurking for a couple months. I guess it takes something breaking to bring people out of the wood work
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Old 03-10-2009, 04:46 PM   #7
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As a side note, I ran my last tank down to fumes...i mean puttering to the station. Do you think maybe a clogged injector could cause the bad idle and or the metalic sound? the sound is most noticeable when the idle is off. I'll pull my supercharger belt in a bit and see if the pully on the snout has any play. Ill update you. Thx again guys. Toddster and danthurs, do you relaize how much money you guys have probably saved the bonneville community? awesome
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Old 03-10-2009, 04:50 PM   #8
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Please send donations to me. Good luck, hope your coupler has play. It'* a easy cheap fix.
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Old 03-10-2009, 05:16 PM   #9
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Do I really need to take off the wheel to loosen the belt tensioner when I'm not replacing the belt?
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Old 03-10-2009, 05:23 PM   #10
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No, just put the wrench on the tensioner and turn it counterclockwise. Then slip the belt off.
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