Escort L4-98 1.6L SOHC VIN 5 FI (1985)
ISSUE:
A rough idle created when the air by-pass valve is replaced may be caused by a revision made to the valve's wiring harness.
Vehicles built before the 1989 model year had a diode in the air by-pass valve wiring harness. The new replacement valves have a 3D marking on the
plastic portion of the solenoid, above the connector cap, Figure 1. They have a diode in the air by-pass valve.
On the air by-pass valves used on vehicles built before the 1989 model year, the positive and negative leads are not important to the operation of the
valve. However, the polarity on the new replacement air by-pass valve is important because if the wiring harness is reversed the air by-pass valve will not
work.
ACTION:
Reverse the wires in the air by-pass valve connector and retest the valve. Refer to the following EFI Engine Application Chart for
engines using these air by-pass valves.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES:
620800
