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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old March 4th, 2005, 10:54   #61
Bill_Blazek
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Join Date: Sep 2004
Location: Littleton, Co
Fuel Economy: ~48/gal B100
Default Re: Glow plugs 101 ***Ver. 2.0***

Jared,

If its starting a lot better now with new plugs then that's probably the problem.
You still should check the DTCs to make sure its not something else.
If it is the GP error it should clear right away.
It will not clear itself even after fixing the problem.
You have to clear it with the OBDII tool.

I have had the problem with the GP harness corrosion causing the GP error too.
In that case, the code just keeps coming back instantly as soon as you clear it.
Then either the harness needs to be replaced or
try some di-electric grease for the connectors in the harness.
Both are described in other posts above.
Its a good idea to use the dielectric grease to prevent the harness from
getting corroded in the first place.

I was getting the GP errors apparently due to the harness.
I had a hard time getting the code to clear.
This was very frustrating because the car always starts right up very easily.
The plugs show the proper resistance and the harness shows full voltage but
was still getting the error and turning on the CEL light which really bugs me.
I seem to have it fixed for now with the dielectric grease but probably will
have to replace the harness eventually.

Good luck.
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Old March 5th, 2005, 21:46   #62
dslemaire
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Default Glow plugs 101 ***Ver. 2.0***

I might add that I found why I was getting the CEL after changing glow plugs and harness. The connectors that are inside of the wiring harness for the glow plug harness actually backed out of the large round plug which has a lot of the control wires going through it. Not enough to notice, but enough to where sometimes it would work and sometimes it wouldn't. I pulled the wires out of the plug and spread the metal tabs on the connectors and pushed them back inside. No more CEL.
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Old March 15th, 2005, 12:46   #63
Keli_OR
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Default Glow plugs 101 ***Ver. 2.0***

I'm saving this thread.

I feel like I've been in CEL purgatory!!!!

Keli
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Old March 15th, 2005, 13:08   #64
Paul_L_Fisher
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Default Re: Glow plugs 101 ***Ver. 2.0***

One thing I tried sucessfully is using contact cleaner from Radio Shack. I had checked all the resistance and all GP's where the same. I sprayed in the harness and you could hear bubbling! Goodbye CE light!
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Old July 12th, 2005, 07:17   #65
volmaniac
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Default Re: Glow plugs 101 ***Ver. 2.0***

thanks wingnut! got my 1st cel (with 50,132 miles, 132 miles over the warranty...) last week. vagcom read gp for the #4 cyl, the bad gp was in the #1 cyl ('02 golf gls). going to replace with the champion gp this time.
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Old September 9th, 2005, 05:36   #66
STRANGETDI
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Default Re: Glow plugs 101 ***Ver. 2.0***

One question: What is the part # of a new glow plug harness? I may need to go this route now. Thanks.
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Old September 15th, 2005, 19:50   #67
moondawg
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Default Re: Glow plugs 101 ***Ver. 2.0***

Quote:
One thing I tried sucessfully is using contact cleaner from Radio Shack. I had checked all the resistance and all GP's where the same. I sprayed in the harness and you could hear bubbling! Goodbye CE light!
I also used this product. The first time I used it, it did NOT solve the problem. The second time I used it, I also used a small needle file to lightly file the inside surface of all of the glow plug connectors on the harness. This seems to have solved the problem.

The CEL is doubly bad on the MFA, because all of your useful information is covered up by the message "Emissions Workshop." it sucks.

Thanks wingnut for the cool how-tos!

moondawg
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Old September 16th, 2005, 06:07   #68
STRANGETDI
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Default Re: Glow plugs 101 ***Ver. 2.0***

Quote:
One question: What is the part # of a new glow plug harness? I may need to go this route now. Thanks.
Also, what is the kind of contact cleaner from Radio Shack? I may try that before I get a new harness.
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Old September 16th, 2005, 07:45   #69
Paul_L_Fisher
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Default Re: Glow plugs 101 ***Ver. 2.0***

http://www.radioshack.com/product.as...t%5Fid=64-4315
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Old September 16th, 2005, 07:46   #70
moondawg
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Default Re: Glow plugs 101 ***Ver. 2.0***

The stuff I used comes in an Aerosol bottle with a detachable brush on the nozzle.

I picked up the needle file set at TSC (Tractor Supply Company) for $4.(yay CHINA!) It had 6 small files in it. I'm guessing the filing will solve the problem on its own.

moondawg
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Old September 27th, 2005, 11:54   #71
greenflyer
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Default Glow Plug replacment

How do i find out which glow plug is which? I had my TDI scanned and they said it was the # 1 cylinder glow plug that needed replacing. And what kind of glow plug is it? or can i just replace it with any bosch glow plug?
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Old September 27th, 2005, 12:17   #72
ymz
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Default Glow Plug replacment

On your car, the computer "counts" the glow plugs in reverse order... so your "problem" GP is really # 4 - the one closest to the driver's side...

That said, the problem is quite likely corrosion inside the harness... needs a good scrubbing with a Q-Tip (minus most of the cotton) and an eletrical parts cleaner or anti-oxidant such as DeOxit D5... may need to be done several times, followed by a clearing of the CEL with either a Vag-Com or a generic OBD scanner...

BTW: did you check the resistance of the glow plugs? It could still be a bad plug...
http://forums.tdiclub.com/showflat.php?C...&PHPSESSID=
WingNut's "How-To" thread... see Glow Plugs 101...

You really should replace a Bosch with a Bosch and a Beru with a Beru, but the sky won't fall down if you don't...

Yuri.
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Old September 27th, 2005, 12:18   #73
Paul_L_Fisher
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Default Re: Glow Plug replacment

#1 is the one closest to the timing belt. Right hand side when you are sitting in the car.

As for glow plugs themselves, go get Champion ones from Napa for under $20.
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Old September 27th, 2005, 14:25   #74
rdkern
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Default Re: Glow plugs 101 ***Ver. 2.0***

Set of Beru's from www.tdiparts.com for $60 currently. If you want to replace them all, this is a good deal.
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Old September 28th, 2005, 17:48   #75
robere
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Default Re: Glow plugs 101 ***Ver. 2.0***

Is it OK to put spark plug grease in the boot that mates the glow plug to the harness?
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