Surge, Detonation and False Code 53 After TCC Lockup

Number: 86-235

Section: 6E

Date: APRIL, 1987

Subject: SURGE, DETONATION AND FALSE CODE 53


Model and Year: 1986 MONTE CARLO & EL CAMINO WITH 5.0L ENGINES (V.I.N. CODE H)
AND THM-200-4R TRANSMISSIONS
TO: ALL CHEVROLET DEALERS


Some 1986 Monte Carlo and El Camino Model Vehicles with the 5.0L engine and 4 speed automatic transmission may experience the following customer comments of:

1. Surge after TCC lock-up.
2. Detonation on light acceleration.
3. False Code 53 - EGR Control Error.

If normal service procedures in the Shop Manual do not
correct the customer comments, a new service PROM with
revised calibration is now available.

MODEL - PROM APPLICATION

Year Model Engine Trans. Emissions Service
PROM P/N

1986 Monte Carlo 5.0L 4 Spd Auto California 1228478
El Camino

1986 Monte Carlo 5.0L 4 Spd Auto Federal 1228479
El Camino

Use applicable labor time and operation numbers.