It's for pullers and race trucks that dont get driven on the street.

 

So I take it glow plugs arent necessary for start up? Sorry for any dumb questions im still learning about these motors.

 

It depends on compression ratio and temperature. Most of the competition trucks run lower compression so a little ether might be needed if there's no glow plugs.

 

Thanks

 

Yea no glow plugs on a street truck will probably be ok in the summer but in the winter it sucks. Hers my lb7 i had, no intake heater and the glow plug controller went out also so no glow plugs either. It was about 15 degrees out.

 

Ya that was a pretty rough start. Will that mess your engine up after awhile?

 

Na wont hurt your motor. Probably kill your starter tho and batteries

 

Until you make your glow plugs swell up and they end up being too big to come out, so then you have to break them off into your cylinder, and you end up having to pull the head to get the other half of the glow plug out.

Nope... not bad at all.

 

Buddy snapped off a glow plug in his Lbz that I've posted pics here before. It was a nightmare. He took it to a local shop after he threw his hands up. Dude got it without havin to pull the head but he said it took him all day. Billed my buddy almost 2k....

 

Wow, for 2k you'd think he might have just been better off doing a valve job on a used set and swapping heads.

 

Ok i must not understand whats going on here. How is cranking the motor with no glow plugs active going to "swell" up a glow plug and cause it to break off when trying to extract the plug?

Not arguing or sayin it hasnt happened but i dont see it.

 

cranking/running with the glow plug delete kit won't cause any harm, other than hard cold starts, because it replaces the glow plugs with "dummy plugs"

Constantly starting a truck without waiting for the wait to start light to go off or not having an operating glow plug system (with the glow plugs still in it) makes the glow plugs to swell up at the tips. Ask anyone that has worked in a military motorpool. None of the operators wait for the wait to start light to go off, and the swollen tips happened constantly.

 

Constantly starting a truck without waiting for the wait to start light to go off or not having an operating glow plug system (with the glow plugs still in it) makes the glow plugs to swell up at the tips. Ask anyone that has worked in a military motorpool. None of the operators wait for the wait to start light to go off, and the swollen tips happened constantly.

Better tell GM. When started with the keyfob my stock 2013 LML starts before the light goes out all the time.

Assuming the glow plug is at its hottest point when the light goes out, how would cranking when glow plug is colder make it more susceptible to deformation?

 

Oh thanks for the input. I honestly had no idea a thing like that was possible.

 

Thanks for the info everyone. Learn something new everyday.


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I turned off my glow plugs, aka removed my GPCM.

 

If I did that I wouldn't be able to use my truck all winter......definitely nice to be in a warm climate.

 

When we pulled my motor I found that I only had about 4 glow plugs working. I removed the glow plugs, cut the tips off and reinstalled them and I have removed the GPCM. As my truck will mainly be used in the summer for pulling and sit in the garage in the winter unless absolutely needed in the winter.

 

Eric do you have any pics of what you did with your GPCM? What did you do with the power wire from the GPCM to the glow plug rail?

 

So starting with the wait to start light on will wreck the glowplugs?

 

That shouldn't do anything other than make it a bit harder to start since the GP tips aren't up to temp yet.

 

I assume just shrink wrap and electrical tape out of the way?

 

Last night we actually just pulled the fuse and I will wrap it up out of the way later on this weekend.

 

several people I work with have disabled the glow plugs. lowest temp around here in winter is 28 - 29 degrees and that is rare.

 

I just snapped a glow plug right above the threads and currently have a local shop trying to extract the part of the plug stuck in the head. Welcome to Diesel Truck World, rookie (me). Wondering if I could leave it in there and hope the tip/part left in the head doesn't somehow fall into the cylinder (wondering if that is possible?) while driving. Any thoughts?

 

Unlike the old military 6.5 GM engines, a Duramax doesn’t have to have glow plugs to start unless it’s cold. The old 6.2, 6.5 engines will not start without them unless the engine has been run already and hasn‘t been shut off long or you warm it up some other way like a fuel fired heater. The main thing that swell glow plug tips are ether hitting them while they are hot or the relay sticks and they stay on longer than they were designed to. I have had to break off a glow plug tip on a Ford 7.3 IDI, not a Powerstroke, and then start it. The glow plug tip will “usually” either embed itself in the piston or get blown out the exhaust. Rarely I’ve seen it get hung up with the exhaust valve and cause problems with the seats.