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Thread: Son's P38a - She no go

  1. 10th May 2013, 06:05 PM #11
    bee utey's Avatar
    bee utey
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    A few thoughts:

    The petrol system must run properly for the LPG system to get the correct signals to convert to LPG injection signals. Providing the wiring of the LPG system isn't faulty, ie the injector cut wiring is fully intact, then you need to concentrate on the petrol first.

    Now if its only running on 4 cylinders, one of the coil packs may be unplugged. If the LPG computer takes its RPM signal off one coil (like I do it) and that plug wasn't fitted properly, it could jump off. I had an alternator regulator plug jump off my wife's car a few weeks ago, that was nearly embarrassing. So it's easy enough to do.

    Without any other knowledge, I'd also be looking at a MAF (mass air flow meter) failure, especially if the mixtures are really lean or rich. LPG won't fire at levels that petrol will just manage.
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  2. 12th May 2013, 05:17 PM #12
    Armitage_Shanks
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    G'Day again.
    Just thought I'd update the thread with what we found today.
    Using my OBDII scanner, I found a series of error codes. I reset the codes and we started the car. Immediately I got a code reading P0205 - Injector Circuit Fault on Injector 5. After driving the car for a short trip, we also got codes indicating running rich on banks 1 and 2.
    So I think that's probably the root cause of the issues. A dodgy injector or injector wiring.
    My son has it booked into a RR and Jag specialist for Tuesday. I'll update the thread with the outcome.
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  3. 12th May 2013, 05:19 PM #13
    Armitage_Shanks
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    Quote Originally Posted by Keithy P38 View Post
    Out of curiosity is it a gems (pre '99) of Thor (post '99) Rangie?
    By the looks of it, it's a Thor motor. Bosch engine management. That means its a Thor, right?
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  4. 12th May 2013, 06:22 PM #14
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    bruce p38
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    Right !
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  5. 13th May 2013, 08:24 AM #15
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    I support Bee utey's position, fix the petrol first! My guess will be MAF or intake air leak.

    The LPG can cause all kinds of rich/lean faults and especially "injector circuit fail" faults that aren't true. The LPG system will try to fool the petrol ecu and confuse it.
    Now: 2005 L322 Vogue 4.4 M62TU (Black)
    Before: 2000 P38A HSE 4.6 - stately capability | 2008 Kluger KX-S | 2004 Forester | 2000 Yamaha XJR1300 | 1993 VR Calais | 1974 HQ Statesman - 308 V8 | HT | HK
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  6. 23rd May 2013, 10:30 PM #16
    Armitage_Shanks
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    G'Day again guys.
    Just thought I'd update the thread before it gets bumped off the first page.
    So, it took a while, but they found that the car had a faulty O2 sensor and a faulty injector #5.
    The car runs really well now. Except - the LPG solenoid sometimes sticks. Other than that it's all good.

    Thanks for all the help BTW. You guys are great.
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  7. 24th May 2013, 07:06 AM #17
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    glenhendry
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    Good news.

    Strange that you got rich on banks 1 and 2, and only one O2 sensor was faulty?
    Now: 2005 L322 Vogue 4.4 M62TU (Black)
    Before: 2000 P38A HSE 4.6 - stately capability | 2008 Kluger KX-S | 2004 Forester | 2000 Yamaha XJR1300 | 1993 VR Calais | 1974 HQ Statesman - 308 V8 | HT | HK
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