Engine - Exhaust Tailpipe Smoke After Extended Idle
87chevy22Number: 86-256-6A
Section: 6A
Date: NOV., 1987
Subject: ENGINE EXHAUST SMOKE AFTER EXTENDED IDLE
Model and Year: ALL 1986 MODELS WITH 2.5L
ENGINE (VIN CODE R AND U)
TO: ALL CHEVROLET DEALERS
A condition of blue exhaust tailpipe smoke may occur during drive away, after an extended idle, on 1986 models with a 2.5L engine.
This condition is the result of excessive oil accumulation on the exhaust valve stems and only occurs after prolonged idle period followed by a rapid application of the throttle.
To repair this condition replace all the exhaust valve springs with spring, P/N 3735381, and shield, P/N 10007818.
As in any service procedure diagnostics are the key to an effective repair. Verification that existing intake valve seals are present and correctly installed and that casting porosity is not present should precede this procedure.
Use applicable labor operation number and labor time.