LLY: glow plug controller problems and more

[skleppy]

Its possible...but if there was something bad in the plugs then number 3 (P0673) shouldn't be working either. I'm not saying its not possible or maybe the module isn't reading the resistance from that plug, but odds are they're probably toast. For the price of plugs, I would pick up a set of eight and do all eight if you have three that are done.

[turnpike]

And while you are checking glow plugs, check the wiring for each also.
May have to find a wiring diagram that shows color codes, as I think each one should be a different color.

[BlackMax Canada]

I see methods to bench test the glow plugs, but same method while still in the engine I presume?

Check Ohm between 1 and 5??

Of course we just had our first snow dumping of the year and the truck is a block of ice....will be getting to the testing Wednesday. Have 4 GP's on order and should be here Tuesday

[BlackMax Canada]

Update:

Rough start below -8Celcius (sputter, cough, ford-ish rattle)
codes (But NO CEL): P0671, P0675, P0677 - Glow plug 1, 5 and 7

Ohm'd all 4 on the passenger side with known codes for 1, 5, and 7 being the bad GlowPlugs. I tested them in the block by removing the wire to each of them and running test leads from block to the lead on the GP on the 0.00 (20k) setting.

#3 being the known good one, it ohm'd out at 0.00 = good

The rest ohm out at 0.12 to 1.00(open) = bad

Removed all 4 of them and bench tested them to confirm. Same results. Surprisingly all 4 came out with little effort and NONE of the tips were flared (having nightmares of the tips staying in the block)

Installing 4 new AC Delco 63G LLY glowplugs as soon as Dad shows up with the parts (thanks dad!)

Torque spec shows 18ft/lbs and a little high heat anti-seize on the treads then I will call it "good"