Service Procedure

OWNER NOTIFICATION

Owners will be notified of this Special Policy on their vehicles by Chevrolet Motor Division (see copy of owner letter included with this bulletin).

REIMBURSEMENT

Customer claims for reimbursement on previously paid catalytic converter replacement are to be submitted according to the forms and instructions included in this bulletin (additional copies to be reproduced locally) within 3 months (90 days) of the date of their owner letter. Owners must submit original documentation that reasonably confirms the amount of unreimbursed repair expenses, a description of the repair, the date of the repair, and the person or entity performing the repair to receive reimbursement.




SERVICE PROCEDURE - Perform all steps appropriate to customers described symp-

toms.

1. Customer's described symptom is an excessive and continuous loss of power, and no other causes for condition are found.

a. Pressure check catalytic converter for plugging following procedure in the chart on page 3 of this bulletin. If plugging is found, replace converter.

b. If converter is found to be plugged, it is likely that plugging was caused by a rich fuel or misfire condition which must be corrected. Using proper service manuals, check for malfunctioning components such as spark plugs, spark plug wires, mass air flow sensor, pick-up coil and ignition coil. Replace only the above components which are determined to be faulty by diagnosis.

2. Customer's described symptom is a rattle in the catalytic converter area (center of vehicle under passenger seat) during acceleration.

a. Check converter using a rubber or brass mallet (or other convenient method) to verify that the converter has internally deteriorated. If it has deteriorated, replace converter.

b. If converter has deteriorated internally, use procedure from step 1-b to determine cause of rich fuel or misfire condition which was likely to have caused the deterioration.

3. If neither of steps 1-a or 2-a show that vehicle has a plugged or deteriorated converter, it is still necessary to determine if a rich fuel or misfire condition exists by using the procedure described in step 1-b above.