Test NTC-13A - No DTC Mechanical Test

WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Perform TEST NTC-1A, NTC-7A, NTC-7B or NTC-12A, before proceeding with this test. Perform TEST VER-2A after each repair.

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 Technical Service Bulletins (TSBs) that apply to vehicle.
Check engine vacuum. Normal vacuum is 13-22 in. Hg at sea level.
Check engine compression.
Check for exhaust system restrictions.
Ensure PCV system is functioning properly.
Check camshaft and crankshaft sprockets.
Check valve timing.
Check torque converter stall speed.
Check for fuel contamination.
Ensure injector control circuit is connected to correct fuel injector and injector is not plugged or restricted.
Check power booster for internal vacuum leak.

NOTE: If coming to this test from O2S test, and rich or lean condition is not corrected after checking items listed, replace Powertrain Control Module (PCM). Perform TEST VER-2A after each repair.