LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - System/Component Tests) >> Ignition System >> Timing Control Systems (C-4 & C-5) >> C-4, Electronic Spark Timing (Gasoline Engines)

C-4, Electronic Spark Timing (Gasoline Engines)

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.

An open or short to ground in the Electronic Spark Timing (EST) or by-pass circuits will cause ECM to turn on SERVICE ENGINE SOON light and confirm fault causing Code 42 is present. Refer to G - GAS - TESTS W/ CODES article.

scientia non olet · About LEMON Manuals