Century L4-2.2L VIN 4 (1994)
Involved are certain 1994 through 1997 A Car, J Car, L Car, S Trucks and Jimmys equipped with LN2 engines and built within the following VIN
Breakpoints:
Important:
Canadian dealers must have PRIOR approval from their District Service Manager for each individual engine repair described in this bulletin.
Condition
Some customers may comment of a knock, rattle, tap, or tick noise from the engine before the engine has reached operating temperature. The noise may
also occur at operating temperature under light load or deceleration conditions. This noise does not result in any damage but may be objectionable to
some customers.
This noise should not be confused with other sources of noise such as accessory drive ticks, exhaust system rattles, clutch or flywheel noise, etc.
Cause
The cause is a rocking motion of the piston in the bore that can occur, under certain conditions.
Diagnosis
If possible, have the customer leave the vehicle overnight to allow the engine to stabilize at ambient temperature. Start the vehicle and as soon as
possible, operate the engine between 2000 and 2200 RPM. If necessary, on automatic transmission equipped vehicles, shift the vehicle manually into 1st
or 2nd gear to maintain the RPM range.
Caution:
In manual 1st or 2nd, the vehicle may not be able to maintain normal traffic speed within the range between 2000 and 2200 RPM. Be aware that
other drivers may not be prepared for a vehicle traveling at a much slower speed. If possible, attempt to go to a rural area or to an area that has light
traffic.
The noise may be louder if the ambient temperature is cooler and will be much less noticeable with the engine at operating temperature.
Warranty Information
