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Old November 22nd, 2005, 12:42   #1
Wingnut
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Default How To extend glow time with Vag-com - ALH

First and foremost....Big thanks to member Fred (samfisher) who did the experimenting to find this info out. This mod will help a lot of folks with cold start problems who cannot rectify them with a timing adjustment.

Now as we all now, some cars have a difficult time starting when it is just above the freezing mark. This is due to the fact the glow plugs do not come on if the temps are above 9*C or 48*F (or somewhere around there). Any warmer and the ambient temp is usually ok to start fine and any colder than that and the plugs will glow to asist with starting. Of course there is a margin of error a few degrees either way. Also, atmoshperic pressure will affect your glow time too. The higher the pressure, the shorter the glow time. Thats why people at higher elevations will have a longer glow time, even above 9*C.

So in order to extend the glow time, you simply have to log into the engine module and make an adaptation change in group 12.

Here are the directions:

1) Turn on ignition
2) Go to engine controler
3) Log in using 12233 as the code
4) Click on Adaptation and go to group 12.
5) Change adaptation number from 32768 (default) to somewhere around 32700
6) Click test, then save the new value.
7) Close controler
8) Turn off ignition and turn back on again.
9) Go to the engine controler & log in again.
10) Go to adaptation block 12 and you should see a change in the second window. This value is the amount of time in seconds that the glow plugs will be active.

Note, you must do this with a cold engine to be able to see the results of your adaptation. You can do the adaptation at any time, but won't notice anything till the engine temp is cold. Also, the new glow time will not appear in the second window (no units) after you do the adaptaion. You must turn the ignition off & on and re-log in to the engine controler to see the results of the adaptation.

I did some experimenting at different temps and this is what I found:

Engine coolant temp was at 7.2*C
Normal glow time is 1.01 seconds



I then changed the adaptation value to 32700 (same ECT)
Glow duration is now 2.88 seconds


And finally, I changed the adaptation to 32650
Glow time was 6.61 seconds:


Now, in my opinion, this last adaptation seting is too much. We only need a few seconds of glow as these plugs get hot very quickly. If you adapt it to this setting, you may prematurely burn out your plugs? Now having said that, everyones car is different and you may have more or less glow time than me at that setting & temp. You will have to adjust it according to your own cars needs. I would recommend setting it to 32700 first and see if your car starts ok and then leave it. If not, and you need a litle more glow time, adjust accordingly. I also have to mention, that this adaptation was done on an ALH engine. I have not tried it on a 1Z(pre 99.5) or BEW PD engine. Hopefully others will experiment and post their results.

For reference, here are some screen shots I took at 13.5*C

Stock setting - no glow


And with an adaptation setting of 32650
glow time is 2.57 seconds


So basically, what you need to do, is find out at what temperature your car has a hard time starting and adjust the glow time according to that temperature. Around 3 seconds is all you need, so if you have a hard time starting the car at 13.5*C (56*F), then set the adaptation to around 32650. If you car starts fine at that temp, but has a hard time around 7*C (45*F), then set the adaptation value to around 32700. Again, this is only my own car and yours may differ slightly. I am also very close to sea level, so if you are higher than sea level, your values may differ also...this is just a guideline.

I hope this helps out all of you who have cold starting issues. But also be aware that glow time is not the only thing to affect cold starts. Do not do this mod to mask another underlying problem. Poor injection timing (mechanical) will also affect cold starts and you should check & adjust that as well before trying this adjustment.

Good luck to all and thanks again to samfisher for the legwork on finding this info out.

Disclaimer: Even though i did this to my car, you are doing it to your car at your own risk. If you blow glow plugs at a high rate, you are your own warranty. This is for informational purposes only
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Last edited by Wingnut; November 23rd, 2005 at 07:26.
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Old November 22nd, 2005, 14:16   #2
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awesome write-up! i'll see how my car does when things get colder.
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Old November 22nd, 2005, 14:59   #3
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LOL!!! I wanted to see what effect altitude had... (I don't have the ability to take screenshots on my VAGcom laptop right now ~ fixed)

Standard setting, 65*C, 5.36 seconds of GP time. I upped the adaptation # to 32800 and it dropped to 5.31 seconds.

Since my car has done 4~6 8+ second GP burns every day for 8 months, I doubt that a 6~7 sec burn will have any issue for most people. I'm going to fuss with this though and see how short of a GP burn I can get away with at altitude. Thanks to Wingnut AND SamFischer for the information.

Edited to add an image ~ I got Paint loaded back onto my laptop without having to reboot.


Last edited by BrianM; November 22nd, 2005 at 15:11. Reason: Added image
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Old November 22nd, 2005, 15:40   #4
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COOL!!! Now I don't need to double plug anymore!!! THANKS!!!

I'm doing this right now!!!

EDIT Done! Engine was too hot to see anything right now, can check tomorow. Oh, and Wingnut, your engine comptuer certinally has an interesting part description

-J
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Old November 22nd, 2005, 17:03   #5
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Take a bow guys!!!!
this is terrific news in Michigan.
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Old November 22nd, 2005, 17:07   #6
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I'm luvin' it! Excellent job once again, Wingnut, for another
Wingnut exclusiv !!!!!!!!!!!
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Last edited by dieseldorf; November 23rd, 2005 at 06:49.
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Old November 23rd, 2005, 07:25   #7
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Quote:
Originally Posted by BrianM
LOL!!! I wanted to see what effect altitude had... (I don't have the ability to take screenshots on my VAGcom laptop right now ~ fixed)

Standard setting, 65*C, 5.36 seconds of GP time. I upped the adaptation # to 32800 and it dropped to 5.31 seconds.

Since my car has done 4~6 8+ second GP burns every day for 8 months, I doubt that a 6~7 sec burn will have any issue for most people. I'm going to fuss with this though and see how short of a GP burn I can get away with at altitude. Thanks to Wingnut AND SamFischer for the information.

Edited to add an image ~ I got Paint loaded back onto my laptop without having to reboot.
Wow, thats a long glow time at such a high temp. Good to know the plugs will be ok at that duration. I knew altitude extended the glow time, but I had no idea it was that dramatic. Thanks for the info.
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Old November 23rd, 2005, 10:38   #8
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Remember the plugs run continuously below 2400 rmp (or whatever the cutoff it, it's right around there) until the engine starts to warm up. That is usually a couple of minutes on my car, so a few extra seconds of preglow shouldn't hurt anything IMHO.

-J

Last edited by compu_85; November 23rd, 2005 at 10:39. Reason: spellcheck
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Old November 23rd, 2005, 10:42   #9
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Damn, you got there before me...

Yup, if you look at any of the tech info on these modern Bosch g/ps, you'll find that they have two elements, the one at the tip as a heater, plus a longer coil farther along the body which acts as a current limiter. This and clever selection of element wire alloy results in a fast heatup and a low-enough steady state temperature that they can be energised damn-near endlessly.
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Old November 23rd, 2005, 11:25   #10
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On my car:







I settled on this last setting.

-J
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Old November 23rd, 2005, 19:27   #11
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Thanks for the info. I have been wanting to extend my glow time for a while now. I had a 4 sec glow at 0degs. Now I have a 9 sec. glow at 0degs.

Thanks again
Dean
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Old November 26th, 2005, 15:22   #12
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This will be a distinct benefit to those with hi mileage GPs....Remember: they get much weaker before they fail.

Bumping up the cold glow period should be a real benefit to those in cold climates!


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New:

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Old November 27th, 2005, 06:25   #13
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damn! That looks like a little lightsaber. hehe

Great info, to be saved to my harddrive immediately.
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Old November 30th, 2005, 03:26   #14
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Verry Kool , I'm going to have to add this to my favs.
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Old November 30th, 2005, 04:35   #15
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I'm curious... Do the glowplugs shut off after the glowplug light goes out? Or is the Glow plug light just an idiot timer to ask you not to start the car until the light turns off?

I guess my question is... Can't you just wait a few extra seconds to start the car?

The plugs are supposed to be on durring periods when the engine running, but still cold. Do they shut off, just to turn back on again?
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