Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
File In Section: 6E Engine Fuel & Emission
Bulletin No.: 87-65-27
Date: December, 1998
Some vehicles with the above engines and equipped with the Opti-Spark (ABITS) ignition system may exhibit an engine miss and/or poor driveability symptoms.
The (ABITS) cap and rotor may exhibit carbon tracking, cracking, or water intrusion which can cause an engine miss and/or poor driveability symptoms.
Perform strategy-based diagnosis. If it is determined that the ABITS cap and/or rotor is the source of the concern, then a service kit may be now implemented instead of a complete ABITS assembly.
There are two (2) variations of Opti-Spark Distributors. It will be mandatory to identify which type is to be serviced for proper parts procurement.
For vehicles repaired under warranty, use:
Remove or Disconnect:
IMPORTANT: The distributor shaft does not have any alignment marks and must be marked at time of removal. For complete engine replacement, set engine on Top Dead Center (TDC) number 1 firing position remove distributor and mark shaft and housing. Reinstall distributor with engine in the TDC number 1 firing position and align distributor marks.
Install or Connect: