83.5 (Digijet) Idle problem - surging/slugish from idle [video]

[shagginwagon83]

Problem: After idle, it is slugish/nonresponsive on the throttle response. If sitting idle for a minute. I have to rev engine up before I start moving again. It works great once it gets moving

What I have done:
-Checked for vacuum leaks
-adjust throttle body
-checked microswitches (I just checked for continuity)
-I paid a local VW shop to set the timing

What I think it could be:
-Either Air flow meter or the throttle body.

Any ideas? Here is a video with engine warmed and the idle control unit bypassed.


Link


Progress:
-Replaced Oxygen sensor
-Bent arm on AFM - help a little
-Inspected Spark Plugs
-Compression test when cold (valves were not adjusted)
-Adjusted valves[/b]
_________________
Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[AZ Landshaper]

timing correct? vac leaks?
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85 Weekender w/ EJ22
Previously
64, 71, 72, 73, 76, 81, 84, 85 & 87 Campmobiles and Westfalias
and a 67 bug.

[Ahwahnee]

What RPM is that idling at (sounds low to me)?

You can trim the throttle body a bit turning (out) that big screw (it adjusts the amount of air that gets around the closed butterfly and is one way to raise the idle a skosh).

[shagginwagon83]

No vac leaks. Air regulator thing was tested and its fine.

[Ahwahnee]

[shagginwagon83]

Very little difference. If turned in all the way, it wants to die. But once like one or two turns backing out from all the way turned in, it doesn't make a difference. I'm actually adjusting it in the video
_________________
Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[Ahwahnee]

Okay, I see that now.

I also see that the arm in your AFM is very twitchy. Mine was like that:


Link


I did several things thereafter to improve idle and tip-in but perhaps most notably I cleaned the track in the AFM and later moved the arm to sweep on a new unworn arc.


Link

[shagginwagon83]

Wow! That's very smooth after. I have cleaned my track with alcohol but it did not help. How did you adjust the arm?
_________________
Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[mad.macs]

My 84 had a lot of trouble like that. After a short drive it would often stall when accelerating from a dead stop. If I turned the engine off at the stop sign, and restarted it, I would have no difficulty off the line.
What worked in my case was disconnecting the O2 sensor input from the computer box. Apparently a short can develop in the wiring, and simply disconnecting the O2 sensor won’t help if the short is in the wire.
If this is your issue, you can replace the shielded cable, plug your sensor back in and be well with the environment.
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'84 Rivi Vanagon Auto Trans, Stock WBX

[shagginwagon83]

I cleaned it again with alcohol. Here's a video with me slowly letting throttle go. You can almost see dots on the track where it starts to Twitch.


Link

_________________
Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[shagginwagon83]

I tried removing the 3 screws and moving the track and no luck. I'm going to buy the gowesty rebuilt. I think it would be a wise investment.
_________________
Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[Ahwahnee]

[mad.macs]

When I moved my wiper track, I imbiggened the holes for the screws and removed about 1/16 of material from the end of the metal plate so I could shift the wiper towards the connector.
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'84 Rivi Vanagon Auto Trans, Stock WBX

[jberger]

First off, let your lifters pump up. Soft lifters will effect idle. Is this a new problem? If it doesn't get better when the lifters are full, I would look at the dizzy\timing. Check your vac cans are working as they should and timing is where it needs to be.

J

[?Waldo?]

[shagginwagon83]

[jberger]

so, your valves have been clattering for years?

[shagginwagon83]

[jberger]

[shagginwagon83]