ENGINE MISS ABOVE 3500 RPM'S MAY BE BROKEN CAMSHAFT LOBE

SUBJECT: ENGINE MISS ABOVE 3500 RPM'S ON VEHICLES EQUIPPED W/3300/ 3800 V6 ENGINE REPLACEMENT CAMSHAFT

VEHICLES AFFECTED: 1989-90 A,H,C,N,E MODELS WITH ENG. CODES C,N

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.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.