1999 Chevy Suburban Valves Tapping
#1
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Changed wires, plugs, dist cap and rotor two weeks ago. Yesterday the engine started making a loud knocking sound. Sounds like the valves are tapping. I checked all fluids and everything is at the proper levels. It doesn't make the noise in park only when you drive it and put a load on it. Was told possibly water pump but checked that and it's not loose.
#2
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Only thing i can think of would be a mis aligned plug wire. maybe double check them to make sure they are going to the proper plug. Also i have had a distributer cap come loose and the rotor was tapping the pegs in the cap and sounded alot like what you are talking about. just some things to check
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Rescue30
Tahoe & Suburban
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June 29th, 2007 12:59 PM