7.3 idi glow plug system problem
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Joined: Nov 2012
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7.3 idi glow plug system problem
Hello. Haven't posted a question in a while, but I'm stumped. My truck (1988 f250) will not start using glow plug bypass (momentary switch) which I installed last year. It worked fine until I was repeatedly holding it for 25 to 30 secs to get it started on a cold night. Truck does start with block heater. I tested all glow plugs with test light and ohmmeter for resistance - all checked out good (they are zd9's). I have power to gp controller hot terminal and jumped to relay resistance ribbon lower terminal with gp harness disconnected at all gp's. Read 11.8-12.0v on each gp connector end, so I assume the harness is ok. Checked relay by having the momentary switch depressed while checking voltage on both terminals of relay ribbon resistor - read 11.9v on each. Any additional troubleshooting tips would be appreciated - this is really kickin my butt! Thanks.
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Joined: Apr 2005
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Sounds like you've covered your bases on the GP system. How many miles on the engine? Maybe the compression's dropped enough to give you problems with cold starts. Or maybe the timing's off some? Just a couple of guesses to give you something to look at. From the thorough check you gave your GP system it sounds like it's working fine.
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Hey, Chevy Eater - thanks for the reply. The truck starts right away when block heater is plugged in so I'm thinking timing and compression are good - engine only has 126k miles. Is there any way gp's are not getting hot even with all the checks I mentioned in my first post looking ok. Is there anything else I can check? Should I pull the plugs and bench test? Any help would be appreciated. Thanks.
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