Idling issues - VW Caravelle 2.5l Petrol

[Simon VW]

The difference in using RON 98 petrol was amazing - it runs so much better. There is still a knock/judder on acceleration sometimes especially in hot weather. Also the air con sometimes flashes for a while before coming on - a bit of reading online says that there could be a fault with the air con but it only happens occasionally - any ideas?

[Sunny43.5]

Has the tank of fuel been used as if mixed with the 91 it will take awhile for the full effect to take place , also remember up here in Qld our heat can have a bearing as well .

[Greg Simmo]

G'day, I've got a 2003 T4 petrol with the same issue, poor idle no power.
I found myself after spending thousands with so called specialists that my plugs had never been changed and a couple of my coils were knackered. Once I changed those and switched to 98 octane the van runs like a dream with no idle or lack of power issues.
The only drama I have is it shuts down in hot weather with the air con on, my display also flashes occasionally but haven't worked that one out yet.



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[paulypal]

Quirkee.
Check the vacuum hose from the engine to the ECU if leaking can cause many of the problems you mention

[PeterT4]

I had some of the same issues mentioned in this thread, & found a simple adjustment to the distributor cap set things right. The cap just needed to be turned slightly & centered. No more stuttering & missing issues. Might be worth a try.