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P38 power loss

Discussion in 'Range Rover' started by Ad60, Jan 27, 2013.

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  1. Ad60

    Ad60 New Member

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    Hi
    I am new to Landzone and hoping someone can help me here. I have a W reg diesel Range Rover P38. Recently the car has suddenly lost power when driving. The auto gears kick down but no power Then It suddenly comes back again. I have changed the fuel filter but the car still keeps losing power. There are no fault codes. Any thoughts?
     
  2. Datatek

    Datatek Well-Known Member

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    Check the MAP pipe from the inlet manifold to the sensor on the fuel filter, check all the inlet & turbo pipes. What year is it? If it has a MAF it could also be that or a sticking EGR valve. How much fuel have you got in the tank? Low fuel and a duff in tank pump is another possible cause, When was the fuel filter last changed?
    What did you use to read the faults?
     
  3. Saint.V8

    Saint.V8 Dyed-in-the-wool 100% RR Junkie Full Member

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    +1 to the above....
     
  4. Ad60

    Ad60 New Member

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    Hi Datatek
    It's a 2000 model. Power loss has occurred when fuel is at varying levels 1/2 full etc. fuel filter changed 2 weeks ago, car fine for a 100 miles then power loss again. Faults read by my local garage who has relevant reader equipment but this power loss has baffled him
     
  5. Saint.V8

    Saint.V8 Dyed-in-the-wool 100% RR Junkie Full Member

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    I'm thinking MAP or the pipe going to it!
     
  6. rangerovertoy

    rangerovertoy Member

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    thinking possible crank sensor intermittant fault?
     
  7. Datatek

    Datatek Well-Known Member

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    Check the in tank pump is working and delivering enough fuel. Could be bacterial growth in the fuel tank.
     
  8. Ad60

    Ad60 New Member

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    Sorry to revisit this post, on my P38 power loss. We found the advice last given tip top so thanks . The pipe to the MAP had come out. This was put back and the car went like a dream, however 2 days later same problem, the loses power struggles on any in line with the gears kicking down to compensate, but to no avail.

    Due back at the garage tomorrow so any thoughts very welcome!

    Thanks
     
  9. Ad60

    Ad60 New Member

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    Meant incline.
     
  10. Datatek

    Datatek Well-Known Member

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    So if it initially went well when you put the MAP pipe back, look for splits in the pipe, blockage at the manifold and at the sensor. A new pipe is worth the few pence it will cost.
    The garage should be able to look at the MAP sensor response using live data on diagnostics.

    Also worth pulling the inlet pipe off the manifold and looking at the EGR valve. You can disable the valve by removing the vacuum pipe from the diaphragm on the EGR.
     
    Last edited: Jan 31, 2013
  11. RovyCouple

    RovyCouple Active Member

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    Same issue, loss of power. Found a short pipe had come off, one end a relay, but cant find where the pipe end goes, on the aluminium inlet manifols ? yes but where?
     
  12. brianp38dse

    brianp38dse Well-Known Member

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    It goes on the nipple under the inlet manifold above the fip you can see it here in line with no2 inlet, make sure its not blocked as well.
    [​IMG]
     
  13. RovyCouple

    RovyCouple Active Member

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    Thats little bugger, unless you knew you'd think it was a screw. Superb shot of the underside of the manifold, makes it easy to show the wife so she can do it next time.
     
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  14. brianp38dse

    brianp38dse Well-Known Member

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    I just just searched for a pic of one for sale on fleebay:D
     
  15. RovyCouple

    RovyCouple Active Member

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    One of the issues with P38 s the original rubber s deteriorate over time , my two have 24 and 22 years each , so will probably have to renew all the rubber bits eventually. especially if been standing and laid up as my v8 was. ah well. Do modern plastics last as long ?
     
  16. Grrrrrr

    Grrrrrr Technician, Bodgit & Scarper Ltd Full Member

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    I was going to say the leak off pipes must be duff as there's a load of crap on it.
     
  17. tomcat59alan

    tomcat59alan Well-Known Member

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    Looks more like the intercooler pipe not tight enough to me.;):D
     
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  18. dubbleRR

    dubbleRR Well-Known Member

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    Just to muddy the water a bit ,If you have a metal manifold like the one shown ,You might have had an engine change ,most w 2000 have plastic ones:rolleyes:
     
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  19. Rubberknees

    Rubberknees Well-Known Member Full Member

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    That's true. I have a 2000dhse but changed the engine for a pre EGR one(metal manifold). If this is so the MAF plays a part in the running of the engine power. To check simply unplug MAF plug from socket and see how it runs. If MAF faulty you will notice a big difference. If you have to change it be wary of some of these cheap Chinese imports, talking from experience. I ran mine for 6 months with maf unplugged befor eI managed to get second hand original
     
  20. wammers

    wammers No longer with us, RIP Donater

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    MAF is for exhaust gas inflow measurement for EGR it has nothing to do with how the engine runs.
     
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