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Krumby
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Joined: January 30, 2019
Posts: 206
Location: Maui
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 Posted: Mon May 17, 2021 12:14 pm Post subject: Idle question 1.9 WBX |
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Aloha I have a 1984 westy with a 1.9 washer ox er which way do you turn the idle screw to increase idle ?
I’m not hearing any difference going either way. Just replaced the rubber boot and I’m chasing idle issues. Figured I start there
Thanks for the help
Mahalo
David
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84 Westy “Betty”
71 bus gone but not forgotten
2015 Harley dyna |
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jlrftype7
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Joined: July 24, 2018
Posts: 3576
Location: Chicago
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| Posted: Mon May 17, 2021 12:57 pm Post subject: Re: Idle question |
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Screw the adjustment screw outward/counter clockwise, to increase the amount of bypass air, which increases the idle speed[ usually, but apparently not in your case] Screw clockwise to decrease the bypass air on the throttle.
So, really check all those hoses that tee into the new Intake Boot carefully, esp down by the Aux Air Valve under the boot, in case just flexing things during R&R of the boot cracked a brittle hose or knocked it off a part/fitting.
IF, you were idling okay before the intake boot[even if it was cracked] hopefully we can get you back to that status... 
Also, is your throttle fully closing and the idle position switch showing a good reading for that closed throttle at idle[ you only need an ohm meter to verify this]
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'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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Vanagon Nut
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Joined: February 08, 2008
Posts: 10371
Location: Sunshine Coast B.C.
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| Posted: Mon May 17, 2021 1:58 pm Post subject: Re: Idle question |
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| Crumby wrote: |
| .... I’m chasing idle issues. Figured I start there |
The stickies here should have info on how to trouble shoot and correctly adjust idle on the Digijet engine.
If you don't have a Bentley manual, there should be an active download link in this forum for the Digijet pro training manual.
Neil.
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1988 West DIY 50º ABA
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Ahwahnee
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Joined: June 05, 2010
Posts: 9798
Location: Mt Lemmon, AZ
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| Posted: Mon May 17, 2021 2:32 pm Post subject: Re: Idle question |
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| Krumby wrote: |
| ...which way do you turn the idle screw to increase idle ? |
Are you turning the (big) screw on the throttle body or the (smaller) screw on the AFM? |
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MarkWard
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Joined: February 09, 2005
Posts: 17114
Location: Retired South Florida
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| Posted: Mon May 17, 2021 2:51 pm Post subject: Re: Idle question |
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What rpm is it idling at now?
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Xevin 
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Joined: January 08, 2014
Posts: 7624
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| Posted: Mon May 17, 2021 3:50 pm Post subject: Re: Idle question |
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| Krumby wrote: |
I’m not hearing any difference going either way. |
I’m pretty good at adjusting idle rpm by “Ear” on a type1 and type4 engines. However when I was making adjustments on the 1.9 wbx I couldn’t “Hear” it change rpm. When I would put my timing light on (With tach) I could see it change rpm.
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MarkWard
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Joined: February 09, 2005
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Location: Retired South Florida
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| Posted: Mon May 17, 2021 4:55 pm Post subject: Re: Idle question |
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The 1.9 has a programmed rpm value. So if you attempt to adjust it, the van is compensating. That’s why I asked what rpm it idles at and what rpm your shooting for.
If your talking about adjusting idle mixture, the same thing is going on. The ECU will attempt to keep the mixture to spec.
Idle circuit and mixture can be adjusted out of spec if you disable some features.
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jlrftype7
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| Posted: Mon May 17, 2021 5:01 pm Post subject: Re: Idle question |
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| MarkWard wrote: |
The 1.9 has a programmed rpm value. So if you attempt to adjust it, the van is compensating. That’s why I asked what rpm it idles at and what rpm your shooting for.
If your talking about adjusting idle mixture, the same thing is going on. The ECU will attempt to keep the mixture to spec.
Idle circuit and mixture can be adjusted out of spec if you disable some features. |
. Good point
_________________
'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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Krumby
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Joined: January 30, 2019
Posts: 206
Location: Maui
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| Posted: Mon May 17, 2021 5:43 pm Post subject: Re: Idle question |
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I’m turning the big screw on the throttle body
Mahalo
David
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84 Westy “Betty”
71 bus gone but not forgotten
2015 Harley dyna |
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Krumby
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Joined: January 30, 2019
Posts: 206
Location: Maui
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| Posted: Mon May 17, 2021 5:44 pm Post subject: Re: Idle question |
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What would I need to disable to adjust out of spec ?
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84 Westy “Betty”
71 bus gone but not forgotten
2015 Harley dyna |
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Krumby
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Joined: January 30, 2019
Posts: 206
Location: Maui
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| Posted: Mon May 17, 2021 8:10 pm Post subject: Re: Idle question |
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So Betty will idle after warmup so what’s my next step in checking ? Replace all vacuum lines and intake boot. What should I check next in the quest for idle after cold start?
Mahalo
David
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84 Westy “Betty”
71 bus gone but not forgotten
2015 Harley dyna |
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MarkWard
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Joined: February 09, 2005
Posts: 17114
Location: Retired South Florida
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| Posted: Tue May 18, 2021 4:11 am Post subject: Re: Idle question |
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Auxiliary air regulator controls idle during warm up.
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Krumby
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Posts: 206
Location: Maui
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| Posted: Sat May 22, 2021 7:47 pm Post subject: Re: Idle question |
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I have an aar on the way I will try that next
Mahalo
David
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84 Westy “Betty”
71 bus gone but not forgotten
2015 Harley dyna |
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