97 riveria - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-28-2009, 05:56 PM   #1
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I am working on a 97 riv vin1 and it has a chirp/etch noise coming from the front cover area. have replaced timing chain,gears,waterpump,all belt pulleys,alternator,supercharger,p/* pump and it is still there. now only noisy at idle and noise is still there with belts taken off the engine. soundsw like an "erp-erp" from engine. pinpointed to front with stethoscope. need help fast, it is a customers vehicle and it just came back after 6 months. the only way it did go away was when i added BG brand MOA to engine oil after oil change. HELP HELP!Thanks.
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Old 12-27-2011, 01:23 PM   #2
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That certainly sounds like valve train noise. Judging by what fixed it and making an educated guess, anywhere between the lifters and valves.
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Old 12-27-2011, 07:54 PM   #3
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Any chance it might be the balancer going south?
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Old 12-27-2011, 08:02 PM   #4
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2 and a half year old thread. Looks like it never got answered.
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