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PostPosted: Tue Feb 20, 2018 9:39 am 
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Joined: Sat Feb 28, 2009 8:37 pm
Posts: 31
A friend of mine is using my 2003 Ford Transit Luton van , its a factory fitted version .
He has driven through France and northern Spain with a high idle and a refusal of the van to stay running on gas we have changed the idle control valve which only made things worse .
I have asked him to check and if possible replace all vacuum pipes
put old idle control valve back but well lubricated first and make sure there are no air leaks
Clean the sensors on the Vaporisor and also the filter ( if we can find one )
Spray around the intake manifold with WD40 to check for air leaks
Thats about the limit of what we can do, any help or hints would be appriciated or anything obvious i have forgotton


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PostPosted: Tue Feb 20, 2018 4:44 pm 
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Joined: Mon Jan 23, 2012 12:21 pm
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Location: Milton Keynes
Theres two versions of the Necam systems - its a fair bet it will be one of them, If its been working and then suddenly fails to run on gas it suggests either your exhaust sensor is playing up or dead (should be able to monitor if it works on petrol using obd to see that) or the vapouriser is failing to keep a constant supply of pressure.

If nothing has been done on the van recently the vapouriser would be my first place to look - Easy check first to see if its a leaking diaphragm is to remove the vacuum line from it and check if gas is being leaked into the manifold that way. Some water in a jar over the open end of the hose would prove or disprove that.

Any idea if its the EGi type or GSI type (EGI has the distributor, GSI injectors)


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PostPosted: Tue Feb 20, 2018 9:06 pm 
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without Guessing I do not know which system it has , it has a vaporisor that feeds the gas to the injectors I believe that was the main one fitted to the MK6 transits .
With the high idle I was not sure if this could be related to the mysterious rpm filter that I have heard so much about ?


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PostPosted: Tue Feb 20, 2018 11:07 pm 
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Joined: Mon Jan 23, 2012 12:21 pm
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Location: Milton Keynes
The RPM filters do fail - Typically the lights on the display will give a clue whats happening. If it has injectors its the GSI system if its the Necam or Koltec equipment fitted.

The description of the RPM filter doesn't make it very clear what it is - its a PCB with a few components, not really a filter more an amplifier and emulator for the lambda signal - Looks like this if you haven't already found one https://www.autogasshop.co.uk/necam-ford-transit-rpm-filter-lambda-442-p.asp It may be near the LPG ecu, I've not seen the van install to know how its done on them although afaik is is the same front end kit as the cars use.

It may be that failed, best way to tell is swap it for a known good one. Any idea what the lights do when it fails/Plays up? Any Fault codes logged by the petrol system? Probably won't be anything from the lpg side as it does attempt to switch over so doubt its detecting anything wrong.

If your mate can find the vacuum line from the vapouriser its worth checking that, as given the age of the system its likely the vapouriser is in need of attention particularly if it hasn't had much.


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