Rough Idle - 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 02-07-2004, 02:29 PM   #11
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There'* a pic around here somewhere of my TB at 75K miles. Pretty nasty.
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Old 02-07-2004, 05:35 PM   #12
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Sounds like a plan for me this summer as well.
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Old 02-07-2004, 06:15 PM   #13
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I had a 'lopey' idle for a while, but ignored it because I wasn't driving the car often. It ran great, only on idle it nearly stalled the lope was so pronounced.

I finished replacing the water pump, stat, cooling hoses and stuff the other day, was inspecting the hoses for leaks, and happened to notice a vacuum line running off the canister that wasn't connected to anything.

I found the other end, put my finger over the end that was pulling, and the idle smoothed out. HEH! Free repairs teh best!

Those cheap flexible connector "sleeves" that GM used to make line connections can also become very soft with heat and age. In the space between the line ends, they can collapse under the vacuum and obstruct the line.
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Old 02-07-2004, 07:11 PM   #14
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Here'* what a TB looks like with only 80,000 miles on it:




This is the back side behind the throttle plate.
Idle smoothed right out after cleaning.
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