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brickster Samba Member
Joined: January 05, 2004 Posts: 512 Location: CO, USA
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Posted: Fri Jul 23, 2021 6:49 am Post subject: Digijet Idle Stabilizer |
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This was missing on my newly acquired 1984 with the plugs connected together. Mysteriously, the green mounting tabs are still there (torn out in a fit of frustration? ).
I'm not having much luck searching around for one. If anyone has converted to a 2.1 and/or Subaru/Bostig/etc., please DM me if you're willing to let one go.
Was the unit used in any other vehicles? I'm wondering if I can expand my search. |
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9798 Location: Mt Lemmon, AZ
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Posted: Fri Jul 23, 2021 7:06 am Post subject: Re: Digijet Idle Stabilizer |
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I haven't looked at what is available but be aware that while the originals were green the replacements are usually an off-white. |
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brickster Samba Member
Joined: January 05, 2004 Posts: 512 Location: CO, USA
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Posted: Fri Jul 23, 2021 7:10 am Post subject: Re: Digijet Idle Stabilizer |
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Ahwahnee wrote: |
I haven't looked at what is available but be aware that while the originals were green the replacements are usually an off-white. |
Thanks for letting me know. Does it have a different part number? |
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9798 Location: Mt Lemmon, AZ
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Posted: Fri Jul 23, 2021 11:48 am Post subject: Re: Digijet Idle Stabilizer |
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I think it is the same p/n:
I looked at vendors and eBay just to know -- Yikes! They do appear to be NLA from all the usual sources with the going rate being 100 bucks for a used one and more for the odd NOS:
Even ones that are out of stock were commanding high prices at the end:
https://www.brickwerks.co.uk/idle-stabiliser-unit-t3-ct-cu-dh-gw.html
There should be decent used ones considering the number of Vanagons that sill get parted out - hopefully this part will get saved from them. |
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brickster Samba Member
Joined: January 05, 2004 Posts: 512 Location: CO, USA
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Posted: Fri Jul 23, 2021 12:11 pm Post subject: Re: Digijet Idle Stabilizer |
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Thanks again! Good to know that color doesn't matter.
There is someone selling Rabbit ones here in the Vanagon section for a more reasonable price, but they are different part numbers. My understanding is that the box advances timing at idle to avoid going below a certain RPM. However, if it's a different engine and FIS, I am doubtful it would work.
https://www.thesamba.com/vw/classifieds/detail.php?id=2250768
Putting it out there because I see so many conversions these days, and was hopeful that someone had one leftover in their parts box or maybe even still mounted to the firewall. |
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9798 Location: Mt Lemmon, AZ
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brickster Samba Member
Joined: January 05, 2004 Posts: 512 Location: CO, USA
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Posted: Fri Jul 23, 2021 1:30 pm Post subject: Re: Digijet Idle Stabilizer |
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Your Internet search skills are commendable, Ahwahnee. Thanks again. |
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jlrftype7 Samba Member
Joined: July 24, 2018 Posts: 3576 Location: Chicago
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Posted: Sat Jul 24, 2021 5:15 am Post subject: Re: Digijet Idle Stabilizer |
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I have one on order from Bus Depot, back ordered , but it is slated to arrive in August. We shall see. _________________ '68 Westy- my first VW and vehicle/Bus- long gone.- sold it to a traveling Swiss couple....
'67 Type 3 Fastback, my 2nd car- gone
'69 Semi-Auto Stick Shift Beetle-gone
2017 MINI Coopers, our current DDs
‘84 Tin Top - Hilga....Auto |
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brickster Samba Member
Joined: January 05, 2004 Posts: 512 Location: CO, USA
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Posted: Sat Jul 24, 2021 7:31 am Post subject: Re: Digijet Idle Stabilizer |
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I was able to source one from my local VW miscreant.
Should I expect miracles when I hook it up? Will it run like buttah? Like it did when it rolled off the lot 37 years ago? |
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MarkWard Samba Member
Joined: February 09, 2005 Posts: 17114 Location: Retired South Florida
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Posted: Sat Jul 24, 2021 7:41 am Post subject: Re: Digijet Idle Stabilizer |
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Personally, I wouldn't waste my money on a replacement. It adds a point of failure for the ignition system, and with a working auxiliary air regulator and the timing and idle set to spec, you shouldn't even notice it not being there. _________________ ☮️ |
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brickster Samba Member
Joined: January 05, 2004 Posts: 512 Location: CO, USA
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Posted: Sat Jul 24, 2021 9:22 am Post subject: Re: Digijet Idle Stabilizer |
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MarkWard wrote: |
Personally, I wouldn't waste my money on a replacement. It adds a point of failure for the ignition system, and with a working auxiliary air regulator and the timing and idle set to spec, you shouldn't even notice it not being there. |
I appreciate you sharing that, Mark. I think I did find a thread with a similar conclusion. Did my sarcasm work to elicit your response? :^)
You mentioned the AAR. I didn’t realize that the IS was in play during open loop?
Van is new to me and I have replaced all vacuum lines and done a full tuneup (cap, rotor, wires, plugs, oxygen sensor) and cleaned all ECM grounds. I cleaned the AFM track which did help idle and acceleration from stop some. Timing and idle set with a few degrees for my elevation. Both TB switches are good and adjusted correctly.
Fuel pressure regulator is out of spec. Will be replacing soon. My pressure drops immediately at shutoff, so I will then test the pump’s check valve function and replace if necessary. Still has small prefilter, but I will be removing and replacing with a new later model postfilter.
Main complaint is a loping idle once in closed loop. Van sat alot and was rarely used by the elderly PO, so I am contemplating seafoam treatment via TB in addition to my Italian tuneups. |
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9798 Location: Mt Lemmon, AZ
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Posted: Sat Jul 24, 2021 10:21 am Post subject: Re: Digijet Idle Stabilizer |
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brickster wrote: |
...Main complaint is a loping idle once in closed loop... |
Try this: Next time it is loping remove the oil filler cap and see if the loping goes away.
If it does, then you can ponder what that means. |
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brickster Samba Member
Joined: January 05, 2004 Posts: 512 Location: CO, USA
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Posted: Sat Jul 24, 2021 10:43 am Post subject: Re: Digijet Idle Stabilizer |
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Ahwahnee wrote: |
brickster wrote: |
...Main complaint is a loping idle once in closed loop... |
Try this: Next time it is loping remove the oil filler cap and see if the loping goes away.
If it does, then you can ponder what that means. |
I will, thanks!
I should also have shared that, while timing, the mark is not stationary. I have read that the advance/retard on these do fail. |
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MarkWard Samba Member
Joined: February 09, 2005 Posts: 17114 Location: Retired South Florida
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Posted: Sat Jul 24, 2021 10:59 am Post subject: Re: Digijet Idle Stabilizer |
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The auxiliary air regulator has been around since AFC fuel injection. Its basically a heat controlled air bypass to the throttle plate. A cold engine needs more air for the warm up idle speed. As the auxiliary air regulator closes, the air bypass is reduced. They work independent of the ECU. They have an electric heat element and they utilize heat from the engine case. Once at temp, the internal opening is mostly closed.
I loping idle with the digital stabilizer bypassed, would indicate something else. The stabilizer would likely not react quick enough to adjust for a lope. _________________ ☮️ |
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