Just got the tool today and boy I wish I had it a few weeks ago replaced a lot of things on my truck spent a lot of money and time. So the code was P0678 cylinder #8 glow plug circuit.

Just before I go buying more stuff I don't need what is it that I need to fix my truck? I'm not sure if I just need to replace the glow plug or the circuit board? Also what are the best Glow plugs to buy for cold area where it drops down to -6 deg or colder like it did tonight?

 

Stock glow plugs are fine but you have to make sure you get the correct one. The wrong length glowplug can cause catastrophic failure.

There is a GPCM harness/glowplug/module test thread here somewhere that tells you how to ohm out each wire and glowplug so you don't needlessly waste money on parts.

 

Saw the Glow Plug Installer/Remover Tool at NAPA for $19 they also have glow plugs. So I might just get both from them. Also how do you get to #8? Is through the wheel well on the drivers side?

 

Taking the fender liner out is the easiest way to get to them and be able to work with them. I recommend getting a glowplug harness for that side if you're going to remove it. They break very easily even with the harness removal tool.

 

Thanks know a good place to buy all these items? Or I'm I just going to have to get them from two places?

 

Spray lots of your favorite lubricant (Powder Blast, AeroKroil, etc) on the glow plug connector, heat it up w/ a heat gun and remove it w/ the wire trick. You have a good shot at removing it OK.

 

This is a picture i've found of the tool. It seems to pull up on either side of the glow plug "T". Or does it slot in right under the plug ?




On a side note, could i ask a favour from someone doing glow plugs. When the key is off and the glow plug connector is disconnected, could they check if they're getting any voltage to the plug ? For some strange reason i've been getting 10.5v but no current being drawn when back on the glow plug. (My truck is suffering from a no start problem, so more than likely got some wiring problems???)

Gordon

 

The wire trick is suppose to work better than the tool

 

If the tool goes just under the T, then i can see why the wire trick is better

 

Just went thru this my self. Like P0671 is cyl 1, xxx72 is cyl 2, etc, with xx678 being cyl 8...

Chk eng light disclosed prob on my '05 at Calif's new smog check reqmt for diesels. No fix equal no pass, so I fixxxxed it...

Codes easily found on the web, if not here...

Approx $15 plus / minus a few, and easy to do...

 

that tool is a waste of money. it breaks the harness too. imo anyway.

 

I don't think it goes under the "T". It goes between the rocker box and the harness plug/seal, which is basically nothing but bakolite anyway. The seal has a tendency to fracture over time and part of it stays in the rockerbox when you pull the harness. Now THAT"S a pain in the ****......

 

Just pulled P0672 on my 05 6.0L. Two queston's: since its now 'summer' in Vegas, should I even worry about fixing it? 2nd: I've got a silly ext warranty. Will that be covered if I go to the stealer?

Thanks!

 

Any opinions?

 

I would like to know how does the glow plug trip a code? Isn't it just a resistive heating element?