Repeat failure of the #3 Glowplug

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

I have had an issue with the #3 plug failing repeatedly. There is no mechanical damage to the plug, they are just open when read on the DVOM. I have the GDE Eco-Tune. I am using the original type ceramic 7V plugs. I am thinking perhaps I should replace the glowplug module. Has anyone had a similar problem, and what was the fix?

Thanks.

racertracer · **Posted:** Sun Mar 22, 2015 11:23 am

There was an update to the Glow Plug module, not sure if it is the cause of your issue though.

There is a posting regarding the revised number for the unit that you will need to search for.

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

This jeep had the GDE Eco-Tune flashed to it in late 2013. It was my understanding that this GDE tune had an updated Glow Plug control scheme?

DOC4444 · **Posted:** Sun Mar 22, 2015 3:52 pm

Where are you getting OEM ceramic glow plugs to replace the ones that have been failing?

DOC

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

I bought a box of 10 NOS plugs on Ebay for $100 in early 2014.

rankom · **Posted:** Sun Mar 22, 2015 4:43 pm

i had this problem 7 volt etecnos failed no# 2 twice and no# 4 also shortly after , since i replaced the module part no#56044671ac and 2nd set of gp its ok so far , but I'm having long crank issue (cold start only) 5-10 sec , need to diag further . hope this help

ATXKJ · **Posted:** Sun Mar 22, 2015 9:56 pm

Mine had a repeat fail on the #2 plug -and it was a cracked head

the final way the tech diagnosed it-
pulled the plug - to check it - replaced (much easier on #2)
pressurized the cooling system
left overnight
next morning pulled the plug - had antifreeze on the tip.

replaced under extended warranty

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

Tested for a head gasket leak or cracked head tonight using a NAPA Block Tester. The fluid stayed blue the whole time. I ran the test for over 5 minutes on a hot engine, and under load in reverse in part time 4WD with the brakes applied. I don't think I have a head gasket leak, but maybe this is not a conclusive test?

DOC4444 · **Posted:** Tue Mar 24, 2015 8:29 am

My experience with the same tester (used the diesel specific fluid, right?) was similar, but since we were getting coolant in the overflow when towing, went ahead with teardown and found obvious leak.

DOC

flash7210 · **Posted:** Tue Mar 24, 2015 9:02 am

lars0247 wrote:

Tested for a head gasket leak or cracked head tonight using a NAPA Block Tester. The fluid stayed blue the whole time. I ran the test for over 5 minutes on a hot engine, and under load in reverse in part time 4WD with the brakes applied. I don't think I have a head gasket leak, but maybe this is not a conclusive test?

My experience is that the only conclusive test for a head-crack/head-gasket-leak is to pressurize the cooling system (16psi), remove all 4 glow plugs, unplug all 4 injectors, and crank the motor.
If water comes out of any of the glow plug holes you have a problem.

DOC4444 · **Posted:** Tue Mar 24, 2015 9:20 am

True, but I am not sure that a less severe, but still signicant leak may not be demonstrated with that method.

DOC

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

The Napa kit I have came with blue fluid that the literature claims it will work with gas, diesel, propane, etc..

I ordered a glowplug module since they are cheap and will try that. Also will pressurize the cooling system overnight to see if any coolant leaks into the cylinders.

rankom · **Posted:** Thu Mar 26, 2015 7:17 pm

i sent my cylinder head to machine shop for cleaning and inspection , before installation , it was off for gp tip failure never loose coolant . and gp failed again , this was done last year , then i replaced gp module and glow plug lived hope this helps

Repeat failure of the #3 Glowplug

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