HARD START, ROUGH IDLE,CODE 33 EGR BIND IN WIDE OPEN

MODELS AFFECTED: 1983 CIMARRON

Comments of hard starting, rough idle, black smoke and/or intermittent check engine light (code 33) on 1983 Cimarrons (with vacuum pumps), built before B.P. 418443, may be caused by the EGR valve sticking in a wide open position after engine shutdown. All Cimarrons built before B.P. 410423 were equipped with vacuum pumps. Following B.P. 410423, only cars with Cruise Control were equipped with vacuum pumps.

This condition can be eliminated by installing an EGR valve vacuum bleed connector (P/N 14079541) in the EGR signal vacuum line at the EGR valve (see Figure 1). This bleed will allow trapped vacuum to dissipate after engine shutdown and the EGR valve to return to a closed position. Proper EGR operation can be determined by the diagnostic chart.

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.