While on our Utah trip I got an engine service light. Scanner tells me I have an open circuit for the glow plug in cylinder 6.This might be related to what I think was bad diesel but can't be sure.Has anyone had this problem? What would it take to fix?2007 MB 6-cyl turbo diesel in a sprinter chassis.

You can test the GP by putting control light between + what you can find in fuse box and GP cable. MB sedans do have plugs on the relay where after pulling it out you will find # of the plug for testing. I assume Sprinter has the same system. Getting can of MAF or electronic cleaner and clean the plugs would be in order regardless.

I used to test my 6.2 glow plugs by spitting on a finger then RAPIDLY tap the glow plug right after the glow plugs cycled. Be quick or suffer a burned finger.Smart folks, use an inductive ammeter and test amperage BEFORE there's a problem. Any and or all problems will instantly show up if you suspect somethings wrong.

Glow plugs do go bad. Replace it and be done with it.

If the glow plug is accessible you can use a test light, AMP meter or OHM meter to test it. If using a test light hook up the ground end to a 12 volt power source. Touch the point end of the light to the tip of the glow plug. If the light lights you have a ok glow plug, if the light does not light up you have an open glow plug, not working. Glow plugs use resistance to work so this method will not tell you how good the plug is just that it is still working. You can also use an OHM meter to test, hook up the ground side to ground and touch the plug with the positive end. Measure the resistance of the plug and this, if you have the specs for the plug, will tell you the health of the plug. If you have a AMP meter you can hook the meter in line with the plug and it will tell you the amperage the plug is pulling. Again if you have the plug specs you will know the condition of the plug. Many plugs pull somewhere between 6 to 15 AMPs, just depends on the maker of the plug. Sorry, forgot to add one important item. If you have a plug go bad, the plug can swell up and get jammed up in the threaded hole. If you try to force it out you can ruin the threads or break off the tip of the plug causing it to fall into the cylinder. If you do replace the plug and it comes partway out nice and then gets real tight do not force it, screw it back in and take it to someone that has the right tools. Do not want to have to replace a head or block. Be careful.

fiend of mine just had 2 plugs go bad.Busted off or runded the head? $5000 repair. Make do without it. It'll start

Glow plug | Good Sam Community

Roger10378
Explorer II
May 25, 2016
Glow plugs do go bad. Replace it and be done with it.
MEXICOWANDERER
Explorer
May 24, 2016
I used to test my 6.2 glow plugs by spitting on a finger then RAPIDLY tap the glow plug right after the glow plugs cycled. Be quick or suffer a burned finger.

Smart folks, use an inductive ammeter and test amperage BEFORE there's a problem. Any and or all problems will instantly show up if you suspect somethings wrong.
Kayteg1
Explorer II
May 24, 2016
You can test the GP by putting control light between + what you can find in fuse box and GP cable.
MB sedans do have plugs on the relay where after pulling it out you will find # of the plug for testing. I assume Sprinter has the same system.
Getting can of MAF or electronic cleaner and clean the plugs would be in order regardless.

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