K 2500 Truck 4WD V8-379 6.2L DSL (1988)
Throttle Position Sensor: All Technical Service Bulletins
Engine - Intermittent No Power and Black Smoke at WOT
GMC NUMBER:
88-T-134
GROUP:
6E - ENGINE EMISSIONS
DATE:
JULY, 1988
CORPORATE
NUMBER:
856403
SUBJECT:
INTERMITTENT NO POWER AND BLACK SMOKE AT FULL THROTTLE
MODELS:
1988 C/K 1, 2 TRUCKS WITH 6.2L DIESEL ENGINE (VIN CODE C)
CONDITION:
Some 1988 C/K Trucks equipped with the 6.2L (VIN Code C) engine may experience a condition where it idles well, but has a no power and black
smoke condition at wide open throttle. Additionally, the vehicle may not go over 40 mph. If this condition is encountered, it may be caused by the male
terminals of the T.P.S. switch connector on side of injection pump being partially collapsed
causing poor contact with the female half of the connector. The E.C.M. then loses the T.P.S. signal, causing the engine to go to full E.G.R. The E.C.M.
may set a code 21. To correct the condition, repair the connector terminals using procedures on page 6E2-44 of the 1988 Light Duty Manual to provide
adequate contact.
Labor Op:
N6270 Labor Time: .6 Hr.
