AuthorTopic: 3.9EFI running problem.  (Read 1922 times)

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Offline Jim-Willy

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3.9EFI running problem.
« on: October 20, 2010, 18:17:21 »
Hi, I am having issues with my 110, it has a 3.9EFi and auto box out of a Range Rover.  It starts on petrol and lpg but once you set off and come off the accelerator to pull up at a junction etc it stalls and is then difficult to restart and won't idle when it finally restarts, if you are on a straight road and can drive without lifting off the accelarator it will eventually be ok and will run happily.  Any ideas as to what this could cause this?  This is my first EFI V8 and has run ok for the last 3 months and has just started doing this...  Cheers in advance.
« Last Edit: October 20, 2010, 18:22:20 by Jim-Willy »
'ear all, see all, say nawt; Eyt all, sup all pay nawt; An' if ivver tha does owt fer nawt; Allus do it fer thi sen.

     

Offline Range Rover Blues

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Re: 3.9EFI running problem.
« Reply #1 on: October 21, 2010, 01:34:31 »
Sticky idle by=pass valve, it's on the back of the plenum.  Try cleaning with carb cleaner or WD40, otherwise it's a new one.
Blue,  1988  Range Rover 3.5 EFi with plenty of toys bolted on
Chuggaboom, 1995 Range Rover Classic
1995 Range Rover Classic Vogue LSE with 5 big sticks of Blackpool rock under the bonnet.

Offline dod51e

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Re: 3.9EFI running problem.
« Reply #2 on: October 22, 2010, 01:33:21 »
Is this problem on LPG or Petrol?  If it is from cold the switch over to LPG could be too early as the vapouriser is still too cold and/or incorrectly set.
If just on petrol then I would second the above as a prime cause followed by a duff temperature sensor (not the one that goes to the dash).

Offline Jim-Willy

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Re: 3.9EFI running problem.
« Reply #3 on: October 28, 2010, 14:56:46 »
Both petrol and gas, i'll check out the bypass valve at the weekend, cheers.
'ear all, see all, say nawt; Eyt all, sup all pay nawt; An' if ivver tha does owt fer nawt; Allus do it fer thi sen.

     

Offline Rossko

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Re: 3.9EFI running problem.
« Reply #4 on: November 02, 2010, 19:32:42 »
EFI ECU also looks for a signal from the autobox selector, so it can lift the idle a bit to compensate for box drag.  Could be a wiring problem (missed in the conversion?) or PN switch
GLASS

Offline Jim-Willy

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Re: 3.9EFI running problem.
« Reply #5 on: November 07, 2010, 13:10:37 »
Seems RRB was right, cleaned the valve and it worked for a few hours then the fault reoccurred, hit the valve and it improved so a new one is required.  It has a new fault now, no power to the fuel  pump, a large brown wire to the relay which should i think be a permanent live isn't, trying to trace why is proving problematic.  Damned electrickery!
'ear all, see all, say nawt; Eyt all, sup all pay nawt; An' if ivver tha does owt fer nawt; Allus do it fer thi sen.

     

Offline Range Rover Blues

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Re: 3.9EFI running problem.
« Reply #6 on: November 08, 2010, 01:03:19 »
Blue,  1988  Range Rover 3.5 EFi with plenty of toys bolted on
Chuggaboom, 1995 Range Rover Classic
1995 Range Rover Classic Vogue LSE with 5 big sticks of Blackpool rock under the bonnet.

 






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