Glow Plug Control - Failures
Bulletin No. 86-67File in Group 6D
Number 28
Corp. Ref. No. 576401
Date July '86
SUBJECT: DIESEL GLOW PLUG CONTROL FAILURES
MODELS AFFECTED: 1984-85 MODELS WITH 4.3L OR 5.7L ENGINES
1984-85 model diesels use a control module containing a timer module and a relay. There have been cases where control module malfunctions were the result of an open circuit in the unit. This is particularly true of intermittent problems with the glow plug system. To correct this condition:
Figure 1 - DIESEL GLOW PLUG CONTROL:
1. Remove the glow plug module and remove the cover and timer module as shown in Figure 1.
2. Visually examine the timer module for evidence of damaged components or circuits. If no problems are noted, go to step 3.
3. Pull the relay wires out of both clips. Scrape the ends of the wires to remove the coating. Supply a ground to one end of relay wire and momentarily place 12 volts to the other end to be sure the relay works. (The sound and motion of the relay working is very evident). If the relay works, position the scraped end of the wires down into the clip area as shown in View A of Figure 1 and reinstall the timer module.
4. Solder the prongs of the timer module to the clips and the wire.
5. Reinstall the cover and reinstall the unit on the car.
6. Place a test lamp across the relay terminals, turn the ignition key to "run" and check system operation. Make sure the wait lamp operates satisfactorily and the test light goes out after the engine has been started.
For warranty purposes use operation number:
C D/E/K
T6161 .6 .5