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Thread: Lack of power at revs

  1. 23rd September 2014, 08:09 AM #1
    TheTree
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    Lack of power at revs

    I have a slightly frustrating issue

    The beast started to miss and lose power under heavier loads, eg ascending a steep long hill on the M1.

    I suspected fuel starvation so I changed the fuel filter, which was indeed full of crap. This improved things but did not fix the issue completely.

    I have checked the fuel pressure and it looks within spec.

    It has also started to die completely and then come back on, mainly after a longer run.

    I suspect I may have more than one issue here, one post I found said that these were classic symptoms of a dying CPS.

    Unfortunately I can't get my nanocom to talk to the ECU for any length of time and what I do get seems scrambled

    I am going to go and hook my nano up to another P38 and see if it is OK or if it is my wiring. It will talk to the BECM perfectly so I think the OBD connector is fine.

    My current suspicions are the CPS, good to have a spare of these anyway, and possibly the fuel pump which is about 4 years old.

    Any other ideas welcome!

    Steve
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  2. 23rd September 2014, 08:48 AM #2
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    davidsonsm
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    I'd check the throttle cable adjustment as a simple starter. They have a habit of backing off.

    Have you had a look at the condition of the fuel injectors? Have you clearned the MAF. Is the coil pack sound. Just my two pennies worth.
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  3. 23rd September 2014, 08:52 AM #3
    TheTree
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    Quote Originally Posted by davidsonsm View Post
    I'd check the throttle cable adjustment as a simple starter. They have a habit of backing off.

    Have you had a look at the condition of the fuel injectors? Have you clearned the MAF. Is the coil pack sound. Just my two pennies worth.
    Thanks mate,

    I have run some injector cleaner through the system

    the MAF clean is on my list though I can't test it until I get the nano talking to the ECU properly

    As far as I know the coil packs are not very old either

    Steve
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  4. 23rd September 2014, 09:57 AM #4
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    mtb_gary
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    Steve

    Could be something as simple as plugs and leads

    Gary
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  5. 23rd September 2014, 10:13 AM #5
    TheTree
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    Quote Originally Posted by mtb_gary View Post
    Steve

    Could be something as simple as plugs and leads

    Gary
    Thanks mate, I am slowly going through the obvious stuff

    They are on the list as well

    Steve
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  6. 23rd September 2014, 12:25 PM #6
    TheTree
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    I cleaned the MAF and it seems to be much happier.

    Real test will be on the freeway

    Thanks for the suggestions everyone

    Steve
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  7. 25th September 2014, 11:52 AM #7
    mabutho Guest
    I also experienced that problem in a month or so, it was very very frustrating. I wud take off from a robot and the Landy
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  8. 25th September 2014, 11:56 AM #8
    mabutho Guest
    Sorry about....I was saying the Landy would take its time to build up speed then all of a sudden it would jump cz my foot is flat on the pedal as m trying to push it..I was relieved to be told by LR workshop that after checking it they found an air pipe loose from the TURBO...so try and check it too...
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  9. 25th September 2014, 02:13 PM #9
    Hoges
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    Does that model have O2 sensors? Anything available from the Torque app which might give some hint re. fuel trim?
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)
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  10. 25th September 2014, 06:36 PM #10
    TheTree
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    Quote Originally Posted by Hoges View Post
    Does that model have O2 sensors? Anything available from the Torque app which might give some hint re. fuel trim?
    Hoges

    Still trying to get the nanocom to talk sensibly to the ECU

    I had fitted O2 sensors but I am pretty sure it will not be seeing them.

    Steve
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