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Thread: LPG on P38 backfiring...

  1. #11
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    Feb 2013
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    Hi Mate

    You need to remove the A/c ducting and lift the carpet, it's behind the BECM almost on the rear passenger floor.

    A bit of a bugger to get at !

    Good luck
    Steve

  2. #12
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    Thanks mate, will check it out tomorrow.

  3. #13
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    The other spot is behind the kick panel where the bonnet release is, the panel is held on by a screw and a clip.

    There is an earth point there, and a white connector which tends to get corroded as well

    Steve

  4. #14
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    hi again, well i looked at all those places, undid the bolts and moved around and re tightened.There was no sign of corrosion at all in any spot. I did the two in engine compartment too as when i go to high beam the radio turns off and on and they were listed.If engine is running its not so bad and if i switch on and off a few times only the first one or two will turn radio off and on...still no dash faults though so i think new battery helped. I read in a forum that at 2000rpm i should be getting 14.4v or so from alt but i get 13.54, so i swap out alternator to a spare i had, this one does 13.78v , i always thought that was normal. My radio is aftermarket and the wiring is a birds nest...i unplugged it and found no change so must be ok. I will get new relays to replace the ones under kick panel, failing that i might have to bite bullet and take to an auto electrician.

    thanks again for assistance.

  5. #15
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    Feb 2012
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    Carnegie
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    Could your issues be related to the engine bay fuse box? Is there any evidence of hot spots or over heating when you inspect under the relays?

  6. #16
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    I thought of that too Davidsonsm, I am on my second fuse box now, the old one had cracks all over it. i think its ok. The relays, the yellow ones all have a little browning on them but have been swapped with other spares and found to be ok. i am planning on taking it out again and going over it. I could not see where one of the relays was related to the lights. Thanks for the idea though.I will check again.

  7. #17
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    In order to get 14.2V you need as much load as you can put on so headlights on high beam and HEVAC fans flat out. Then hold the engine steady at 2000 RPM and measure the voltage

    Steve

  8. #18
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    Along shot, but check out Relay #11. The relays are numbered vertically from the top LHS of the fuse box ...check the diagram under the lid. Relay #11 is involved with high beam. I am thinking that also you may have an issue with the BECM (hopefully not!) As best I can determine when you use the high beam, the act of blipping the indicator stalk sends a message to the BECM which activates relay #11.

    It may be worth removing relay 11 and seeing if it has an impact on the radio etc. I haven't done this to test my theory just trying to eliminate possibilities.
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)

  9. #19
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    Hi hoges , I played with relay #11 it looks ok, not burnt. I removed and flicked high beam, no difference. If I was to replace BECM...god forbid , but if I do, do you know if any other computer needs to pair with it on the change or just the unit alone.

    Sent from my HTC One XL using AULRO mobile app

  10. #20
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    Quote Originally Posted by deano2469 View Post
    Hi hoges , I played with relay #11 it looks ok, not burnt. I removed and flicked high beam, no difference. If I was to replace BECM...god forbid , but if I do, do you know if any other computer needs to pair with it on the change or just the unit alone.

    Sent from my HTC One XL using AULRO mobile app
    If you replace the BECM your key remotes will no longer work and your ECU will need to be paired, unless you have a Bosch system in which case you need to fit them as a pair.

    Much easier just to get the BECM repaired, which is the path I am taking.

    Steve
    Last edited by TheTree; 6th October 2014 at 06:50 PM. Reason: removed some stupidity ;)

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