DR-24 Driveability Problems Not Related to Engine Controls

TEST NO. DR-24

COMPLETE TEST DR-22B OR DR-23A BEFORE PROCEEDING

AT THIS POINT IN THE DRIVEABILITY TEST PROCEDURE, YOU HAVE DETERMINED ALL OF THE ENGINE CONTROL SYSTEMS ARE OPERATING AS THEY WERE DESIGNED. THEREFORE, THEY ARE NOT THE CAUSE OF THE DRIVEABILITY PROBLEM.

THE FOLLOWING ADDITIONAL ITEMS SHOULD BE CHECKED AS POSSIBLE CAUSES:

1. ENGINE VACUUM- MUST BE AT LEAST 13 INCHES IN NEUTRAL.

2. ENGINE VALVE TIMING- TO SPECIFICATIONS.

3. ENGINE COMPRESSION- TO SPECIFICATIONS.

4. ENGINE EXHAUST SYSTEM- MUST BE FREE OF ANY RESTRICTIONS.

5. ENGINE PCV SYSTEM- MUST FLOW FREELY.

6. ENGINE DRIVE SPROCKETS- CAM, CRANK AND INTERMEDIATE SHAFTS.

7. TORQUE CONVERTER STALL SPEED- TO SPECIFICATIONS.

8. POWER BRAKE BOOSTER- NO INTERNAL VACUUM LEAKS.

9. FUEL CONTAMINATION- HIGH ALCOHOL AND WATER CONTENT.

10. TECHNICAL SERVICE BULLETINS- ANY THAT MAY APPLY TO VEHICLE.

ANY ONE OR MORE OF THESE ITEMS CAN CREATE A DRIVEABILITY RELATED PROBLEM. THEY CANNOT BE OVERLOOKED AS POSSIBLE CAUSES.