HELP p38 no spark
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Thread: HELP p38 no spark

  1. #1
    FRESHMAN ROVER
    Join Date
    October 17th, 2007
    Location
    Hampshire England
    Posts
    26

    HELP p38 no spark

    Hi to all, I'm pulling my hair out with my p38, its a 2000 4litre. Parked it on the drive a few days ago, came out to it a few days later turned the key and it cranked over but wouldn't start! check for spark and there wasn't any. So...... have found that i have live to the coils, i have live going back to the ecm from the coils as it does, so obviously i've thought the ecm isn't switching the coils to earth to create spark as it does. so have fitted a new crank sensor, checked that the wiring is ok from the crank sensor to the ecm and still no spark and still no go!! Can anyone give me some most gratefully appreciated ideas/advice??
    Also, can anyone tell me if it is possible to test the crankshaft sensor, as i suppose I can't rule out that the new one is duff. (highly unlikely I know, but still, would like to rule that out)
    2000 P38A 4.0

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  3. #2
    Des
    Des is offline
    FRESHMAN ROVER
    Join Date
    February 8th, 2006
    Location
    Melksham Wiltshire United Kingdom
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    103
    Could be the engine is immobilised by the security? Becm and engine ecu need to have matching codes and will let engine turn over but not fire up if codes are not matching. Try a search on this subject as I have seen similar past issues.
    Rovacom P38 modules Gems,Motronic EAS,BECM HEVAC,GBOX

  4. #3
    FRESHMAN ROVER
    Join Date
    October 17th, 2007
    Location
    Hampshire England
    Posts
    26
    HMMM, thanks for that, have been reading a few of the posts as you said and it does sound likely as the battery had died and needed jumping, and as it was parked for a few days, so it will have had time to discharge slowly which is a main factor in the becm losing the ecm code according to the posts i read.
    Next question then, i take it theres no way to re sync the becm and the ecm without testbook or rovacom and a ludicrous charge from somewhere? Or is there any way that I can just disable that part of the system so the ecm and becm don't need to exchange codes?
    2000 P38A 4.0

  5. #4
    FRESHMAN ROVER
    Join Date
    August 25th, 2007
    Location
    Western Australia
    Posts
    12
    mine did this this morning i hope someone can help....
    turns over, but no go..

    Jeff
    rover money pits

  6. #5
    SOPHOMORE ROVER
    Join Date
    June 14th, 2006
    Location
    Hertfordshire - UK
    Posts
    317
    Check engine light is the key to this one (if GEMS).

    Read here:

    http://www.rangerovers.net/forum/vie...034&highlight=

    Particularly 3rd post.

    HTH

    David
    ps Put Car details and your location in your profile, can help us with diagnosis.
    1996 4.6 SE - Prins VSI LPG
    Stealth HSE Upgrade Status - Wood trimmed door cards, electric memory seats, front fogs, 18" Alloys, rear reading-lamps, rear footwell lamp, front footwell lights, electrochromatic mirror; illuminated passenger visor.

  7. #6
    Premium Member
    Join Date
    January 21st, 2006
    Location
    UK,South West
    Posts
    1,036
    You need a BECM/Motronic security relearn to be done,the Motronic ECU will allow cranking but no sparks or fuel - unlike GEMS which wont even crank.
    Think beyond -

  8. #7
    FRESHMAN ROVER
    Join Date
    October 17th, 2007
    Location
    Hampshire England
    Posts
    26
    Hi guys, have the becm and motronic resynced but still no spark!
    2000 P38A 4.0

  9. #8
    Premium Member
    Join Date
    January 21st, 2006
    Location
    UK,South West
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    1,036
    Now you need to scope the crank sensor,did whoever did the relearn check that the Motronic ECU is now fully mobilising ? The relearn does not always work first time.
    Think beyond -

  10. #9
    FRESHMAN ROVER
    Join Date
    October 17th, 2007
    Location
    Hampshire England
    Posts
    26
    crank sensor is 100% ok, relearn was performed a few times and codes are definately matched, but motronic still won't kick the coils.
    2000 P38A 4.0

  11. #10
    Premium Member
    Join Date
    October 1st, 2005
    Location
    Atlanta, GA, US
    Posts
    1,423
    Allyv8,

    Is this repair / correction something that you do ?

    You might not be all that far away from each other.

    (I'm not too far out on a limb. I looked up Hampshire already).

    Dan
    P38: 1999 Bosch

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