plenum replaced now tapping - 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 05-11-2009, 03:34 PM   #11
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not that I'm aware of, mechanic stated there was a leak and he just replaced the gaskets and then about a week later it started surging so I brought it back and they noticed it was leaking again and the MAP sensor was replaced. Now 1 day later this problem.
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Old 05-11-2009, 04:46 PM   #12
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The oil should have been changed after the gaskets are done. This will remove any coolant that might have dripped in to the engine.
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Old 05-11-2009, 05:35 PM   #13
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the tapping is ur wrist watch rattling around in there from when u took it off while working under the hood.lol
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Old 05-12-2009, 12:31 AM   #14
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they now say the cam bearings are shot. did by chance the coolant wash the bearings and cause this? I know I can't prove they did anything wrong but they did not change the oil after changing the plenum. They also said they changed the plugs because they had coolant on them.
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Old 05-12-2009, 08:22 AM   #15
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If the coolant got in to the oil the damage was already done. Try changing the oil again and see if it makes any difference. But a rebuild might be needed.
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Old 05-15-2009, 09:15 AM   #16
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I went to change the oil and it looks like the mech shop(they ones who messed up) changed the oil AFTER I took it back to have them look at it and they told me the cam bearings were messed up. Now I don't have proof that they didn't change it after they replaced the plenum. Anywho we drained that oil and replaced and added ZMAX and after it started and warmed up the tapping went away. Been driving it for 3 days and now the check engine light comes on but still no tapping - except a slight noise when just started after cooling off.
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Old 05-15-2009, 09:20 AM   #17
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Get the light read and post what it is.
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Old 05-15-2009, 10:35 AM   #18
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Places like Autozone should be able to scan the CEL for a specific code.
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Old 05-16-2009, 01:01 AM   #19
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It was just a broken vacuum hose. All ok so far. We are going to change the oil again next week and add another bottle of the ZMAX and hope it keeps going. Would like to get another couple of years out of it.
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Old 05-16-2009, 01:17 AM   #20
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How many km or miles does she have? out of curiosity
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