NS-8A Checking Engine Starts and Stalls

Perform Test NS-7A Before Proceeding

NOTE: At this point in the driveability diagnosis, you have determined that all of the engine control systems are operating properly and are not the cause of the START and STALL problem. Check for applicable Technical Service Bulletins (TSB's), if you have not already done so. Then check the following mechanical failures which could cause the problem:

VALVE TIMING:
Engine valve timing should be at manufacturer`s specifications.

COMPRESSION:
Engine compression should match manufacturer's specifications.

EXHAUST SYSTEM:
The engine exhaust system must be free of any restrictions.

PCV SYSTEM:
Air in the PCV system must flow freely.

ENGINE DRIVE SPROCKETS:
Cam and crankshaft sprockets must be properly positioned, and not have excessive wear.

FUEL CONTAMINATION:
Check the fuel system for high alcohol and/or water content.

SECONDARY IGNITION SYSTEM:
Check for proper scope pattern.

NOTE: Any one or more of these items can produce a start and stall condition, and none of them should be overlooked as possible causes.