Engine - Spark Knock/Hesitation/Surging

85ford04

Article No. 84-16-16-S


SPARK KNOCK - 3.8L - SPARK PLUG DEPOSITS


HESITATION - 3.8L - SPARK PLUG DEPOSITS


SURGING - 3.8L - SPARK PLUG DEPOSITS


IDLE - POOR QUALITY - 3.8L - SPARK PLUG DEPOSITS


IDLE - RPM LOSS - 3.8L - SPARK PLUG DEPOSITS


STALLS - 3.8L - SPARK PLUG DEPOSITS


FORD 1982 GRANADA, T-BIRD, 1983-84 MUSTANG, T-BIRD, LTD

LINCOLN-MERCURY 1982 COUGAR, XR-7, 1983-85 CAPRI, COUGAR, MARQUIS

LIGHT TRUCK 1982-83 F SERIES

CALIBRATIONS: All 3.8L engines.

WARNING: This modification is authorized only for the listed engines. Performing this modification on other engine calibrations is unauthorized and could create liability under applicable federal or local law.

This article supersedes TSB 84-16-16. The above drive concerns can be caused by oil ash deposits on the spark plug tips caused by oil leakage past the valve stem seals. When diagnosing these concerns, check spark plugs for oil ash deposits and for oil fouling, and, if present, replace the intake valve oil seals as follows:

1. Remove the valve covers.

2. Remove the rocker arm, key, retainer and valve spring from the intake valve only.

3. Remove and discard the umbrella shaped valve stem seal from the intake valve.

4. Install the new seal over the intake valve stem and onto the valve guide. Be sure the seal is fully seated.

5. Spark plugs that are oil fouled or exhibit oil ash deposits should be replaced.


PART NUMBER PART NAME CLASS

E3DZ-6571-A Seal - Intake Valve Stem A
(Std.)
AWSF 54C Spark Plugs A


WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP6571A85
TIME: 2.3 Hrs. DLR. CODING: Basic Part No. 6571 - Code: 40