tick over occasionally high Syncro 2.1DJ

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syncro4us
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tick over occasionally high Syncro 2.1DJ

Post by syncro4us »

After several years of good service the tick over occasionally runs high. From the standard 850rpm it goes to 1200rpm when stationary after warm up. When you blip the throttle it mostly goes back to the default 850rpm. So is it the tick over stabilisation unit or the automatic choke as I find on short journeys the consumption goes way up. Normally running on LPG we get 17mpg from the engine but recently on short journeys it goes down to 11 or 12mpg so can anyone suggest the cause and is it readily fixable.
We recently had our system adjusted by the LPG system installer, an agent in Chester and it solved many of issues with an immediate return to 17mpg but the higher tick over still dogs the van

Kevin

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Aidan
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Re: tick over occasionally high Syncro 2.1DJ

Post by Aidan »

could be the idle control switch not switching or the air bypass valve is sticking or a wiring continuity issue, check switch hot, clean valve and electrical gremlin fault find if that doesn't work when it's in fault mode, the DJ manual is available online to download for all the necessary procedures

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HarryMann
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Re: tick over occasionally high Syncro 2.1DJ

Post by HarryMann »

Aidan wrote:could be the idle control switch not switching or the air bypass valve is sticking or a wiring continuity issue, check switch hot, clean valve and electrical gremlin fault find if that doesn't work when it's in fault mode, the DJ manual is available online to download for all the necessary procedures
Check all that as Aidan says...
If not do some reading up yourself (DJ owners need to be well up on all their foibles esp. as winter approaches. 8090 wiki and tech archive is a good source)

But another long shot would be Temp sender on thermostat playing up possibly corroded broken wiring/ connectors.
Also earthing of everything ! A good centrepoint for earth is body of Alternator.
A few hours well spent cleaning re-making star earths, bulkhead and system amplifier earths will at least rule out a lot of unknowns..
Else you could be chasing your tail for months

Try moving T2 sender wires etc with engine idling listen for change.

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The 80-90 Tech Wikipedia Your 1st port of call :idea

1.9TD Syncro Doka / Syncro Kastenwagen / 16" Kombi Camper
Syncronaut No. 1

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