Bronco Full Size V8-302 5.0L (1986)
Air Bypass Valve Solenoid: Customer Interest
Exhaust - White or Grayish White Smoke
Article No.
EXHAUST - WHITE OR GRAYISH WHITE SMOKE -
87-5-33
5.0L EFI - DURING ENGINE IDLE
LIGHT TRUCK 1985-86 E SERIES, F SERIES, BRONCO
ISSUE:
Vehicles built between 11/01/84 and 07/31/86 may give off a white or grayish white smoke from the exhaust after extended highway driving.
This is caused by a thermactor system that does NOT switch to "Dump Mode".
ACTION:
To correct this, check the thermactor system using the following service diagnostic procedure and install a thermactor bypass valve and/or
solenoid as required.
1.
Check for kinks in vacuum hose(s) running from the thermactor solenoid to thermactor bypass valve. Refer to TSB 86-9-11 for vacuum hose
service procedure.
2.
Perform EEC IV quick test. If service code 46 displays, proceed to Step 3. If any other service codes appear, correct as necessary.
3.
Refer to Volume H, Section 10 of the Engine/Emission Diagnosis Shop Manual for component location and Section 21 (Pinpoint Test KC) for
diagnosis. If the thermactor bypass valve needs to be replaced, replace with bypass valve, E1TZ-9B289-C, and if the thermactor solenoid needs to
be replaced, replace solenoid with E6UZ-9D474-A E Series, and E4ZZ- 9D474-E F Series, Bronco.
4.
Make sure the vacuum hose(s) are attached securely and are routed to avoid any obstructions.
PART NUMBER
PART NAME
CLASS
E1TZ-9B289-C
Thermactor - Bypass
B
Valve
E6UZ-9D474-A
Thermactor - Solenoid -
C
E Series
E4ZZ-9D474-E
Thermactor - Solenoid -
B
F Series, Bronco
OTHER APPLICABLE ARTICLES: 86-7-16, 86-9-11
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP870533A
TIME:
1.4 Hrs. - F Series, Bronco 1.5 Hrs. - E Series DLR. CODING: Basic Part No. 9B289 - Code: T5
