Especially on the 1.9 you can simply disconnect the throttle switch. It's only function at idle to cut off the injectors when the engine is being overrun such as coasting downhill or down shifting to slow the vehicle down. Since the cut off speed is low like 1,300 rpm, that is why you can get that idle surge if the basic settings are not correct. If you still get the idle surge or off idle stumble with the switch disconnected then it is most likely the connectors for the throttle switch and auxiliary air regulator was reversed. From the factory the blue connector goes to the switch and the black goes to the regulator, If the connectors were changed all bets are off. Easy way to check which is which is with a volt meter. With the ignition on the switch connector will have 5 volts and the auxiliary air regulator has 12 or battery voltage. It gets is power from the injector circuit. It is not fused so when connected to the throttle switch the switch is instantly destroyed. 

Dennis
 

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Neil N
Sent: Saturday, May 21, 2016 5:16 PM
To: vanagon@GERRY.VANAGON.COM
Subject: 2.1 Throttle Switch Assmebly on 1.9 with later style switch?

Hi all.

I'm searching the archives but not getting any hits.

Am helping a friend with a 1.9 WBX Vanagon. Her engine uses the later style throttle switch but it appears to be completely non-op. Her bus has surging issues near-just off of idle. I have a spare 2.1 switch.

Can the Digifant 2.1 throttle switch assembly be used on the 1.9 throttle body with later style switch?

I've read of cam size differences on these later style switches but it seems to me that one should be able to fit a 2.1 switch assembly on a 1.9 throttle body with later style switch.

Thanks

Neil.

--
Neil n

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