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  1. LT35 Losing Power 
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    For some time now I've been plagued with an intermittent loss of power on my van which generally shows itself on motorways once warm.

    From advice I have replaced the air flow sensor which i understand is a common problem on VW diesels but this does not appear to have solved the problem.

    My local garage have plugged in their box of tricks but no fault codes are stored and they have suggested that I need to return the van to them with the fault showing.

    When the fault occurs I simply switch off the ignition, coast for a little way and then switch back on and the fault clears, somtimes to reoccur quite soon, sometimes not to reoccur again for some considerable time.

    Does any one have a clue what might be the cause/cure??
    Last edited by boisty; 21-03-2010 at 05:07 PM.
     
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  2. Re: LT35 Losing Power 
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    Hi Boisty,
    This is a problem i had and still have with my 35, i found the limp mode came in when i had been a bit heavy with right foot on motaway, if you know what i mean, after a while when i was around 50 - 60mph she would cut down as thou the turbo was not there so i do as you have said switch off and alls well again, i had the air flow meter changed at vw dearler and this did cure mine for 100,000 miles or so, but problem has come back again,i have fitted another meter myself but made no diff and was slow to rev from tick over so not sure if a new one has to be set up at dealer maybe some one on here could verify this
    best of luck
    ray
     
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  3. Re: LT35 Losing Power 
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    It is important that you fit a genuine VAG AMM sensor.It is only a matter of replacing the sensor,nothing else needs to be done.boisty does your local garage have the test cable for the LT,i think it strange there are no fault codes
     
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  4. Re: LT35 Losing Power 
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    Hi Kenney,
    sorry to butt in, when mine did it the first time the vw dealer said no code faults came up but they said it sounds like the air mass meter (a common fault) so am i right in thinking that the new air mass meter i have from vw does not need to be set up, just a case of fit and go type item
    again sorry to butt in
    rayl
     
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  5. Re: LT35 Losing Power 
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    It does not need set up.
     
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  6. Re: LT35 Losing Power 
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    Thanks kenney,
     
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  7. Re: LT35 Losing Power 
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    Quote Originally Posted by kenney View Post
    It is important that you fit a genuine VAG AMM sensor.It is only a matter of replacing the sensor,nothing else needs to be done.boisty does your local garage have the test cable for the LT,i think it strange there are no fault codes
    Yeah, they have the test cable and it reads the system ok but finds no fault codes.
    The air mass sensor that I replaced was a genuine air flow sensor and I did expect it to work as the same operation solved the problem on the wife's Seat and on previous diesel Audi's.

    As Rayl said in his reply, the problem only shows itself, when driving at speed if I am a bit heavy with the right foot. Is there some sort of over boost sensor causing it to bring in the limp mode?
     
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  8. Re: LT35 Losing Power 
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    I have the same problem on my 2004 lt35 .I have changed the airflow meter but it still does it, i have taken it to a local specialist and he recons its the actuator rod on the turbo sticking causing the turbo to shut off due to overboost.The vac reading is ok so this adds up because the van was stood for a few months before i picked it up .It used to be a flying fridge and it has 450000miles on it . I recon a new tubro is the way to go ,mine is still on the original turbo and engine. hope this helps.
     
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  9. Re: LT35 Losing Power 
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    Thanks for posting that lee lt, can you say wheather its when you have used your right foot a bit heavy , ie,( on the motorway) for a period of time ?
    mine and boisty have the problem when this is done , plus i have heard of two more this weekend that have the same problem and many more in the past,but, only happens when slightly heavy with the right foot to maintain a high speed, so it seems a sensor or mechanical part comes into play when these higher speeds are used for a period of time.
    is there any one on this forum who works with these motors that can shread some light on a part thats most likly to cause this kind of problem, as replacing this or that item is going to work out very expensive as a try and see cure.
    thanks
    rayl
     
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  10. Re: LT35 Losing Power 
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    Mine cutts the turbo on steep hills in 3rd gear and somtimes on the flat in 4th when nailing it.
     
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