Camper Special - won't idle when cold (video)

[notchboy]

[otiswesty]

My camper special has a low idle cold that stalls occasionally. If I am off and going onto the freeway, no problem. But in town at stoplights I have to hand brake and feather the throttle when cold. Neither safe not pleasant and over the years, I have had to do this plenty. So I know the drill.

The engine idles perfect at warm operating temps. I pulled the AAR and replaced with another spare that I had with a larger aperture by visual comparison. I have the bus in the shop to get scoped and everything looks spot on, but they can't get the cold idle problem figured out either. I have a spare 914 CHT I just got and plan to install that. I'll test out my 2 extra AARs and see if they are functional.

Any other suggestions for a bus lover, not a hater, would be appreciated. It seems like a common issue only at cold idle, so some sort of modified AAR or FI adjustment should be able to solve this.
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1978 Sage Green P22 Westfalia
1989 T3 Syncro Single cab

Just a regular guy

[airschooled]

There is an AAR adjustment page over on Itinerant Air Cooled. Sorry I can't post the link from my phone. If this doesn't help you out, put the AAR in the fridge for an hour before attempting the adjustment. That should help open it up a bit.

AAR adjustment is one of things where there isn't really a ton of info on published specs, so we adjust to suit our needs. It also doesn't affect engine performance or tuning once the engine is warmed up, so it's a relatively harmless adjustment.

Robbie
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[Randy in Maine]

http://www.itinerant-air-cooled.com/viewtopic.php?f=50&t=7834

The CS camshaft doesn't produce a lot of vacuum at idle speeds either. Just the way it is. I have my idle set to about 950 RPMs and it seems to like that speed.