VOLKSWAGEN TRANSPORTER SWB MOTOR CARAVAN 1968cc - intermittent over-revving

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Wed 15 Dec 2010 11:55
VOLKSWAGEN TRANSPORTER SWB MOTOR CARAVAN 1968cc - intermittent over-revving - vwhiccup

I have had the van since new. It is our only vehicle and has only done 52k miles. It always starts first time, and no cutting out until I switch off. But intermittently I wll drive up to the main road and whilst waiting there the revs will bre revving as though starting in a grand prix. The same happens if I stop in traffic.Then if I try to go into 4th or 5 th gear it will jump and i have to slow and go into 3rd to stop the kangarooing. Other times I can drive 4 or 5 miles with no problem - no further.I told the garage about this at its recent yearly service /MOT and they have cleaned the throttle control and put some german fuel system cleaner in the petrol tank.It is no better. Please advise.

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Wed 15 Dec 2010 12:05
VOLKSWAGEN TRANSPORTER SWB MOTOR CARAVAN 1968cc - intermittent over-revving - Collos25

Throttlebody maybe

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Wed 15 Dec 2010 13:39
VOLKSWAGEN TRANSPORTER SWB MOTOR CARAVAN 1968cc - intermittent over-revving - tdc

If it`s revving up and you don`t feel you have proper control over the throttle,sounds like a sticking Idle stabilising/control valve(ISV).They gunge up,fuel cleaner in the tank doesn`t reach them!

Cheapest just over forty quid new .Part no:- 048133455.Sometimes pick up 2nd-hand ones for half that .Have cleaned old ISV`s up but never had to replace one on a 1698 Transporter .Other veedub ones may fit but for peace of mind use part no above?

Dread to think how much an original Bosch ISV would cost though?!

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Fri 17 Dec 2010 16:30
VOLKSWAGEN TRANSPORTER SWB MOTOR CARAVAN 1968cc - intermittent over-revving - vwhiccup

If it`s revving up and you don`t feel you have proper control over the throttle,sounds like a sticking Idle stabilising/control valve(ISV).They gunge up,fuel cleaner in the tank doesn`t reach them!

Cheapest just over forty quid new .Part no:- 048133455.Sometimes pick up 2nd-hand ones for half that .Have cleaned old ISV`s up but never had to replace one on a 1698 Transporter .Other veedub ones may fit but for peace of mind use part no above?

Dread to think how much an original Bosch ISV would cost though?!

If it`s revving up and you don`t feel you have proper control over the throttle,sounds like a sticking Idle stabilising/control valve(ISV).They gunge up,fuel cleaner in the tank doesn`t reach them!

Cheapest just over forty quid new .Part no:- 048133455.Sometimes pick up 2nd-hand ones for half that .Have cleaned old ISV`s up but never had to replace one on a 1698 Transporter .Other veedub ones may fit but for peace of mind use part no above?

Dread to think how much an original Bosch ISV would cost though?!

thanks for that. The Garage have fitted a new ISV which doesnt seem any better... Should they have rebooted the ECU to the new ISV ?

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Sat 18 Dec 2010 18:16
VOLKSWAGEN TRANSPORTER SWB MOTOR CARAVAN 1968cc - intermittent over-revving - tdc

I thought that just switching ignition off and back on whilst warmed-up engine is running without letting it stall did that,no?

Can you hear the ISV buzzing ?

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