Test NTC-13A - Checking Engine Mechanical Systems

NOTE: Perform TEST TC-118A - FUEL SYSTEM RICH , TEST TC-119A - FUEL SYSTEM LEAN , TEST NTC-10A - CHECKING OXYGEN SENSOR SWITCHING , TEST NTC-10B - CHECKING OXYGEN SENSOR SWITCHING , TEST NTC-11A - CHECKING OXYGEN SENSOR HEATER or TEST NTC-12A - CHECKING IDLE AIR CONTROL MOTOR before proceeding.

NOTE: If coming to this test from an oxygen sensor test, and rich or lean condition is not corrected after checking items listed below, replace Powertrain Control Module (PCM). The PCM is located between driver's side front fender and power distribution center, near battery. Perform TEST VER-2A - ROAD TEST VERIFICATION .

At this point in diagnostic test procedure, all engine electrical control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes:

Check for Technical Service Bulletins (TSBs) relating to driveability problem.
Check engine vacuum. Engine vacuum must be at least 13 in. Hg in with transaxle in Neutral.
Check valve timing.
Check engine compression.
Check camshaft lobes for abnormal wear.
Check crankshaft pulse ring for debris or deterioration. Crankshaft pulse ring contains 2 sets of notches ground into the No. 2 counterweight on the crankshaft.
Check exhaust system for restrictions.
Ensure PCV system is functioning properly.
Check camshaft and crankshaft sprockets.
Check torque converter stall speed.
Check power brake booster for internal vacuum leak.
Check fuel for contamination.
Ensure proper injector driver wiring is installed on correct injector. Ensure injector is not plugged or restricted.