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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 September 7th, 2004, 22:21   #31
Wingnut
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Default Glow plugs 101 ***Ver. 2.0***

TDI Allen just did a great writeup with pictures on how to change the 4 wire harness. So those of you who want to go that route will have a good idea of what it takes. It is quite involved, so I still suggest trying to treat your harness before going to this step. But if you decide to do it, TDI Allen has made the job much easier for you. Here is the link
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Old September 16th, 2004, 10:02   #32
DVDVW
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Default Glow plugs 101 ***Ver. 2.0***

My car :

2001 Golf GL TDI 2 doors

My fault code :

16-764 - Glow Plug / Heater ( Q6 ) Circuit Malfunction

P0380-35-10 intermitent

My question.

My car ( 2001 or older ) will only get the P0380 code, regardless of the glow plug ( coolant or engine ) or harness is in cause? So I need to test all 7 glow plugs and harness to found where is the problem?

Thank you all.
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Old September 16th, 2004, 11:15   #33
weedeater
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Coolant plugs are not monitored.
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Old October 26th, 2004, 13:44   #34
Bill_Blazek
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Wingnut,

Thanks for all the great write-ups like this one!

A couple more detailed questions on GP operation.
Following this write-up I testing my GPs and harness
and found a bad GP. It had infinite resistance.
It went over a weekend before I could get the
new GP and replace it. It may have even been out sometime before that.
Once I did get it replaced I had noticeably more
acceleration, especially from a dead stop up a hill.
I also noticed low gas mileage on the previous tank.
However I have never had trouble starting the engine at all.
Fires right up every time.

My questions:
Do the GPs stay on all the time helping the compression ignition
or do they only stay on for the ~20 seconds during starting?
Was I running on 3 cylinders while the plug was not working?
The engine was running awfully smooth for only 3 cylinders.
I had a hard time telling the was any problem at all.
I was assuming that GPs only operated when starting the engine
and that once it was running they shut off.
Do you or anyone else know more about the details of GP operation
during and after starting?

Thanks again. The info here has been tremendous!

Bill
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Old October 26th, 2004, 14:28   #35
Wingnut
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Glow plugs are used primarily for cold starting. They activate when the coolant temp is below 9*C (45*F). This is knows as pre-glow. They will also stay on for a period of time while the engine warms up. It is just to assist with the combustion. This is sometimes referrd to as afterglow. They turn off as soon as the engine RPM goes over 2500 RPM. So on a cold morning, while driving away after a cold start, you can hear the relay clicking everytime you go over & under 2500 RPM. This is the glow plugs being turned off & on. This stops as soon as the coolant temp rises. This feature is mostly for emissions to help ignite the fuel a little more completely when cold.

So to answer your question, your percieved power probably has nothing to do with the replacement of the glow plug. Unless you noticed the extra power right after a cold start and you experienced it before the coolant warmed up? But glow plugs have nothing to do with the running of a diesel. They are just used to aid in starting. Once started, diesel engines run on compression, unlike gassers who need the spark plug for ignition.
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Old October 26th, 2004, 15:43   #36
Bill_Blazek
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Wingnut,

Thanks much!
That's what I thought.

The engine was luke warm when I changed the plug and
thought I noticed more pickup immediately afterwards.
This AM when it was cool, in a partially heated garage,
it seemed to be better too. But also after it had
completely warmed up. Could have just been my perceptions!

I did notice that it did run smoother in the ~30 seconds
immediately after cold/cool starting this AM.
It wasn't very bad before but noticable and its
notically better the AM.
Will definitely keep an ear on it.

I also just did the ventecomy near the end of the last tank
so I was able to put in 14.3 gals and the low fuel light had
not even come on yet so that threw off the MPG calculation.

Thanks again for all the great info.

Bill
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Old November 5th, 2004, 06:11   #37
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Great thread, everyone. Very helpful. Just wanted to add my .02, though. I was going to replace only 1 or 2 plugs, since VW dealer wanted like $40 per, but I called O'Rielly Auto Parts and they had Champion plugs for $11 each. Just wanted to throw that out there... I went ahead and replaced them all since they were so cheap. <font color="green"> </font> <font color="green"> </font>
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Old November 5th, 2004, 12:03   #38
Bill_Blazek
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Just out of curiosity, does anyone else, like the guys up in Canada,
have any serious, real world, long cold winter experience,
with other brands of GPs, beside Bosch and Beru, like Champion?
How reliable are they and how long do they last?
Are the Bosch and Beru really worth the extra $$$???
I haven't seen any other brands mentioned much here.

Respond2us,
Let us know how they work this winter for you in Ok!
How cold does it get there in winter?
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Old November 13th, 2004, 07:40   #39
celry
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hello everyone

first, thank you for all of the glow plug information and advice! this site in general is a huge breath of fresh air for people like me who are 1)really frustrated with the local vw dealer and 2)mechanically interested in their car.

my 2001 automatic jetta has the P0380 fault code, so i've started wingnut's diagnostic procedure.
the plug resistance reads ok, so on to the relay/harness step. BUT despite wingnut's clearly noted photo, i haven't been able to locate the coolant temp sensor or even the coolant glow plugs.
would anyone help me identify exactly where these parts are?

thanks!
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Old November 13th, 2004, 07:53   #40
Wingnut
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Default Glow plugs 101 ***Ver. 2.0***

Since you have an automatic, you do not have any coolant glow plugs. So in your case, follow the upper radiator hose from the radiator to the block. It attaches to a housing on the drivers side of the head. The coolant temp sensor is located on the back side of this housing facing towards the firewall.
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Old November 14th, 2004, 17:31   #41
Bill_Blazek
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Well that explains why I haven't been able to find mine either!!
I have looked for them several times and not found them!
Thanks!
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Old November 16th, 2004, 08:16   #42
Xgaz
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Quote:
Since you have an automatic, you do not have any coolant glow plugs.
Just curious..., why is that?
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Old November 16th, 2004, 08:41   #43
Chemboy
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Quote:
Quote:
Since you have an automatic, you do not have any coolant glow plugs.
Just curious..., why is that?
The torque converter provides enough of a load on the engine to aid in warming the coolant.
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Old November 28th, 2004, 10:19   #44
Thomas Babb
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can anyone point me to the coolant glow plug sensor on a 99 NB?
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Old December 26th, 2004, 11:49   #45
egh2001
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Thanks for the post, you helped solve my problem. I found that the #2 cyl glow plug was bad not the #3. I guess the computer can't tell the difference. Thanks again. and your post was great.
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