NS-8A Repairing A Start and Stall Condition

TEST NS-8A REPAIRING A START AND STALL CONDITION
Perform TEST NS-7A Before Proceeding

At this point in the diagnostic test procedure it is assumed that all of the engine electrical systems are operating as designed and are not the cause of a start and stall problem. The following additional items should be checked as possible mechanical causes of the no start condition. Any one of these items can produce a no start condition; none can be overlooked as a possible cause.

1. DISTRIBUTOR POSITION - must be within specifications*
2. ENGINE VALVE TIMING - must be within specifications
3. ENGINE COMPRESSION - must be within specifications
4. ENGINE EXHAUST - must be free of any restrictions
5. ENGINE PCV SYSTEM - must flow freely
6. ENGINE DRIVE SPROCKETS - must be properly positioned
7. FUEL - must be free of contamination
8. ENGINE SECONDARY IGNITION CHECK - must exhibit a normal scope pattern Always look for any Technical Service Bulletins that may relate to this condition.

Checking Distributor Position with DRB

NOTE: Engine must be capable of running for the following test.

Connect the DRB to the Data Link Connector and select SYNC from the menu.

WARNING: The following test will be performed with the engine running: avoid contact with rotating components.

Start the engine and observe the DRB display. When the distributor is correctly positioned, the IN RANGE message should appear along with 0°. If the distributor needs to be adjusted, loosen the distributor hold-down clamp bolt. Rotate the distributor until reading is as close to 0° as possible and the IN RANGE message is displayed. Tighten the clamp bolt to 22.5 N-m (200 in. lbs.) torque.

NOTE: Setting the distributor position does not adjust the ignition timing. Ignition timing values are determined by the powertrain control module.