Riviera V6-231 3.8L VIN C SFI (1989)
Camshaft: All Technical Service Bulletins
Engine - Miss Above 3500 RPM Diagnosis
Bulletin 90-6-8
Date Sept. '90
Ref. No. 90-178-6
Corp. Ref. No. 006105
SUBJECT:
ENGINE MISS ABOVE 3500 RPM'S ON VEHICLES EQUIPPED WITH 3300/3800 V6 ENGINES (REPLACE CAMSHAFT)
MODELS AFFECTED:
ALL 1989-90 VEHICLES EQUIPPED WITH 3300/3800 V6 ENGINES
An engine miss above 3500 rpm's, often without an accompanying valve train noise, could be caused by a broken camshaft lobe. If normal diagnostics
fail to pinpoint the source of the miss, and the miss is isolated to the number 2 cylinder, inspect the 4th lobe back from the front of the camshaft for being
broken.
