Glow plug problem no start - Ford Powerstroke Diesel Forum
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Old 12-18-2012, 03:53 AM
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Glow plug problem no start

Ok so the truck just cranks but wont start and smokes alot. First thing I do replace the glow plug relay and I still get nothing. Went through checked all the connections possible everything has power all the relays are working but still glow plugs will not turn on. So I jump the glow plug relay with a piece of wire and they kick on then I can start the truck fine. The relay is autozone ive read this could be the issue but when you jump it the thing works.

At a lose for words and getting annoyed any advice.
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Old 12-18-2012, 04:51 AM
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I would say get a stancor relay
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Old 12-18-2012, 05:03 AM
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Before putting the money into another new relay you need to test to see if the relay is getting the proper signals from the pcm.

Sounds like the large pin on the relay is definitly getting power if you can jump it and the truck will start. Make sure that one of the smaller pins on the relay is getting a ground from the pcm or the relay will not activate.

While running with the glo plugs deactivated both small pins on the glo plug relay will have 12v. But before start up one small pin will have 12v and the other will be a ground.

If this checks out then your new relay is bad.
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Old 12-18-2012, 05:16 AM
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^^^^^ +1; TEST the relay / circuitry before throwing parts at it. A voltmeter costs less than the cheapest AutoZtoner relay.
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Old 12-18-2012, 05:36 AM
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Yea I tested everything with a voltmeter yesterday. Also checked and the relay is getting the proper signal from the pcm. The relay is also getting the proper ground. This is why im at a loss because everything tested fine. I also took a jump wire tested the glow plug relay and the pcm relay in the fuse box clicks.
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Old 12-18-2012, 06:21 AM
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It wouldnt hurt to exchange your new relay for another one. They are pretty good about taking returns. If your relay is getting the proper signals and the truck can start by jumping the large terminals then all signs point towards the relay being bad. Make sure all the connections are clean. Dirty connections will have you chasing ghosts.
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Old 12-18-2012, 06:24 AM
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That is my next step I guess because I cant think of anything else.
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Old 12-18-2012, 06:52 AM
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Measure the voltage _drop_ across the contact terminals of the relay. Turn the key to run, and do either (or both) of the following:
* Measure the voltage _between_ the two big terminals. Put the red probe on the "always hot" terminal. That voltage should be less than 0.3V.
* Measure the voltage (to ground) at each of the big terminals. The difference between the two is the voltage drop, and again, should be less than 0.3V.
Might want to do this on both relays. In either case, if the voltage drop exceeds 0.3V, it won't provide sufficient voltage to the plugs.

The PCM is actually what grounds the coil circuit. You should have 12V at the red/green wire when you turn the key to RUN, and the orange wire (orange? well, the one that's not red/green...) should have continuity to ground, until the PCM cycles off.
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Old 12-18-2012, 09:22 AM
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Im so lost I hate this kind of stuff. My friend did most of the testing and I sent him this and he said he already did all this and everything tested fine he even had alldata stuff to go off of. Thats why I resorted to posting on here cause we both are out of ideas.
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Old 12-18-2012, 09:35 AM
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I did test for voltage at all points on the solenoid, the only place that didnt have voltage was the small pole towards front of the truck. Which when i sent power to it i could hear a click at the pcm relay under underhood fuse box. I suspected that being a ground. As far as voltage drops, i didnt notice any significant drop. I do admit i wasnt really looking tho.

What really gets me is.... you can hear the solenoid "click" with KOEO, and you can see the voltage go across the poles via voltsmeter. I was thinking maybe the solenoid is cutting off amperage?? and not fully getting glowplugs hot?

Like 1ofakindgt said, when i jump the polls with wire or a screwdriver and hold it for like 8 -10 seconds the truck starts without a problem.
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