Bad Glow Plug Causing CEL - Ford Powerstroke Diesel Forum
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Old 03-01-2013, 07:40 AM
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Bad Glow Plug Causing CEL

I still get a CEL when I turn the key on. It usually goes out after 2 or 3 seconds, and the WTS light comes on. During this time I can hear the GPR clicking rapidly. The glow plugs are around a year and half old. The relay was replaced with a Stan Cor last winter. It always starts quickly, even in the cold, but usually produces some white smoke. I figured something is causing the GPR to click, but can a bad glow plug trip a CEL?
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Old 03-01-2013, 10:07 AM
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Bad glowplugs are really only going to cause a CEL if you have a 1997 California model truck (they are the only OBS trucks with the Glowplug Monitoring circuit). We probably need to know more about your truck (year, and mods, recent work, etc.) to be a little more helpful. Do you have a chip installed? Cheers!
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Old 03-01-2013, 12:27 PM
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My CEL light comes on for a coupe secs when I turn the key to light the GP's too. So it's either normal or I have the same issue.
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Old 03-01-2013, 12:34 PM
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all obd 2 (a good amount of obd 1 too) all lights come on when first turn key as a "indicator" test. But you could be having diffrent issue I'm not sure
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Old 03-01-2013, 04:10 PM
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Quote:
Originally Posted by dannanw View Post
all obd 2 (a good amount of obd 1 too) all lights come on when first turn key as a "indicator" test. But you could be having diffrent issue I'm not sure
.....
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Old 03-01-2013, 06:23 PM
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On both our '95s, the CE light flashes VERY quickly when you turn the key to RUN (literally blink and you'll miss it). Then the WTS light comes on almost immediately. The GPR should not cycle on and off quickly like that. Sounds like you have a problem with maybe the PCM grounding out (itself and the GPR) properly, or the GPs drawing excessive power initially, or something.

Try this - remove the wires to the glow plugs from the big terminal on the relay. Then turn the key to RUN. If the CE light blinks off and the WTS light comes on quicker then, that indicates something about the glow plugs having an impact on the voltage.
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Old 03-04-2013, 06:45 AM
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I need to pull the wires, then. It used to blink momentarily, but now it's on for several seconds and then the WTS light will kind of flicker on. I suppose it may even be a loose wire on the Stan-Cor. It isn't starting like it was earlier this winter, either.
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