Question about 1990 Pontiac Sunbird

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1992 sunbird 3.1L, 185,456 miles. 5 sp manual trans at 184,598 miles replaced the lifters due to #3 intake failing. Haven't had any problems since. Yesterday noticed noise coming from engine again that sounds like knocking. Starts about 1200 rpm up to 3000 rpm floating rpm. No noise under accel or decel, just under coast. Appears to be coming from under intake area. Removed both valve covers and inspected valve train. All appears normal. Any ideas that I may have missed as to noise? Don't hear it in the main or rod area, just upper end.

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I ended up removing the oil pan and found #3 rod bearing spun. Have emery clothed the rough spots off on the crank with super fine emery and replaced with updated rod bearing from the OEM dealer. Cleaned out oil pan and replaced oil pump as a precaution. Checked other bearing all measured 0.015 to 0.020 clearance. Goes to show I guess that valvoline motor oil really does the job. (the only oil ever to be put in the engine) Have not had a problem since. Still running strong as the day it was born.

Posted on Nov 10, 2008

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Check the Cam Shaft. its a know issue on these cars. i have a 1990 i have to look out for the same issue. 2.0 Manual.

Posted on Nov 10, 2008


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