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Document ID# 1416911
2002 Chevrolet Avalanche
Engine Misfire due to Injector Fretting Corrosion - kw 2.2 3.1 3.4 3.8 4.2 4.3 4.8 5.3 6.0 8.1 adaptor chuggle fuel hard idle lamp light L36 L1 L18 L61 LA1 LG8 LL8 LU3 LR4 LM7 LQ9 LQ4 LN2 MIL misfire #PI01353A - (Dec 19, 2003)
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
This is a supplement to bulletin 03-06-04-030 for driveability symptoms of long or hard starts, chuggle, rough idle and light or intermittent misfire. The malfunction indicator lamp (MIL) may also illuminate.
Recommendation/Instructions:
Analysis of returned Multec II injectors indicate that terminal fretting corrosion may also be responsible for the conditions described in this bulletin. Fretting corrosion (microscopic in nature) is nearly impossible to detect in the field. Symptoms of fretting corrosion may be a miss that is corrected after the injectors have been disconnected and then reconnected cleaning the terminals in the process. The most effective method to correct this condtion per field comments is to remove the connector and apply/inject dielectric grease, P/N 12377900 (in Canada, P/N 10953529) to the female terminal. Be sure to cover both cavities and reconnect the injector. Please refer to bulletin 03-06-04-030 and/or June 2003 TechLink for further information.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.
Models:
(00, 01, 02, 03 Buick Century, LeSabre, Park Avenue, Regal) and (02, 03 Buick Rendezvous) and (02, 03 Cadillac Escalade, Escalade EXT) and (03 Cadillac Escalade ESV) and (00 Chevrolet S-10) and (00, 01, 02 Chevrolet Camaro, Lumina) and (00, 01, 02, 03, 04 Chevrolet Cavalier, Impala, Malibu, Monte Carlo, Silverado, Suburban, Tahoe, Venture) and (01, 02, 03, 04 Chevrolet Express) and (02, 03, 04 Chevrolet Astro, Avalanche, Trailblazer) and (03 Chevrolet Blazer, S-10, Trailblazer EXT) and (00 GMC Sonoma) and (00, 01, 02, 03, 04 GMC Sierra, Yukon, Yukon XL) and (01, 02, 03, 04 GMC Denali, Denali XL, Savana) and ( 02, 03, 04 GMC Envoy, Safari) and ( 03, 04 GMC Envoy XL, Jimmy, Sonoma) and ( 00, 01, 02, 03, 04 Oldsmobile Alero, Silhouette) and (02, 03, 04 Oldsmobile Bravada) and (00, 01 Pontiac Transport) and (00, 01, 02 Pontiac Firebird) and (00, 01, 02, 03, 04 Pontiac Bonneville, Grand Am, Grand Prix, Sunfire) and (01, 02, 03, 04 Pontiac Aztek) and (02, 03, 04 Pontiac Montana) and (03, 04 HUMMER H2) with 2.2L, 3.1L, 3.4L, 3.8L, 4.2L, 4.3L, 4.8L, 5.3L, 6.0L, or 8.1L Engine (VINs F, 4, J, E, K, S, X,V, T, N, U, G - RPOs L61, LN2, LG8, LA1, L36, LL8, LU3, LR4, LM7, LQ9, LQ4, L1
and Multec II Fuel Injectors)