Glow plug ohm test results- no start white smoke - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 04-01-2014, 04:03 PM Thread Starter
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Glow plug ohm test results- no start white smoke

I am having truoble starting my truck. Cranks white smoke good battery volts was running the other day but has been hard to start.
I am thinking it's something to do with the plow plug system. The gpr had 12 volts going through it when key was in the one position.

Now for ohm test. I tested the gpr on the output side, zero ohm, I tested the plugs by removing valve cover plug just like all the write ups say to do.
Now 6 plugs show zero ohm on the meter and 2 do not read at all.

All the write ups say they should be between .5 and 2 ohms and if over they are bad. What if they read zero??
I have the truck plugged in right now and will see if it starts soon.

Also when I touch the 2 probes of the meter together is reads zero and it should.

Early 99 7.3
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post #2 of 2 Old 04-02-2014, 06:50 AM
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I bet you're just on the wrong Scale with your meter...

"0 Ohms" is a "Short", just like when you hold the probes together, and the element in the plug is kinda the same thing. BUT, to read the degree of the short (Low Ohms) you need to tell the meter you want to look that closely. Try changing the scale.

"No Reading" is "Open" and what a bad GP will read (the element inside has totally burnt-away) and as the resistance rises it shows a plug that's Failing.

Here's the thing though, you got 2 bad ones? Change them All now. I mean, unless you're planning on getting rid of the truck soon, how good could the other 6 be?
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