Bonneville V8-350 5.7L DSL (1984)
Glow Plug Controller: Customer Interest
Glow Plug System - Control Module Failures
Number 85-6(Diesel)-5
Date
6/86
Subject:
DIESEL GLOW PLUG CONTROL FAILURES
1984-85 MODELS WITH 4.3L OR 5.7L ENGINES
CONTROL MODULE
1984-85 model diesels use a control module that contains 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, remove the
glow plug module from the car and remove the cover and the timer module as shown in Figure 1.
Visually examine the timer module for any evidence of damaged components or circuits. If no problems are noted, proceed as follows:
Pull the relay wires out of both clips. Scrape the end of the wires to remove the coating. Supply a ground to one end of the relay wire and then
momentarily place 12 volts to the other end to make 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. Solder the prongs of
the timer module to the clips and the wire. Reinstall the cover and reinstall the unit on the car.
Place a test light across the relay terminals, turn on ignition key and check system operation. Make sure the wait light operates satisfactorily and the test
light goes out after the engine has been started.
Warranty Information
Add .1 hr. to the published time to solder coil wires.
