Page 1 of 1
rover v8 starts & stops straight away !
Posted: Sun Aug 17, 2008 9:52 pm
by phil's landy
Hi there folks !
Please help !
I have a 3.5 efi hot wire out of a 1991 disco (running well before removal), just fitted into my light weight ,
I have wired up the ecu as per details on this site , now there are 2 earth wires coming out of the loom 1 is black and the other is black with white bands on , when i connect the latter to earth the relay buzz's yet the engine only fires up if this is earthed ,but only runs for a few seconds ,i have wired the 3 bar fuel pump to the purple/white wire and also connected the red/white to starter position , i tried a wire direct to the pump and still engine only goes for a few seconds ,there is also earth at the - side of the coil when the engine runs !
Any ideas welcome !
Cheers Phil
Posted: Sun Aug 17, 2008 10:09 pm
by Coops
white with black bands sounds like the ecu trigger wire that goes to the negative side of the coil,
Posted: Mon Aug 18, 2008 10:24 am
by demo2
Yup i'll second that
v8 starts then stops
Posted: Mon Aug 18, 2008 5:46 pm
by phil's landy
Hi there !
I have checked on a range rover today and this wire is an earth to the o/s/f inner wing. it is black with white bands not a white tracer which as you say is from the coil ,
So i'm still strugling, any more ideas ?
Posted: Mon Aug 18, 2008 6:15 pm
by Coops
you have the ignition relay of the ecu going to a live when in the run position have you? and not only live when cranking?
Posted: Mon Aug 18, 2008 9:20 pm
by phil's landy
Hi there ,
Yep the relay has a live all the time with ignition on ,
The relay that buzzes stops buzzing whilst the engine runs and the starts to buzz again a few seconds after engine cuts out .
Any ideas ?
Posted: Mon Aug 18, 2008 9:40 pm
by Coops
what wires has the relay got going to it that buzzes m8?
colour wise,
can then tell if its a fuel pump relay or ignition relay
Posted: Tue Aug 19, 2008 5:02 am
by phil's landy
I'll check tnite and come back to you .
Cheers Phil
Posted: Tue Aug 19, 2008 9:12 pm
by phil's landy
Hi there,
Today i have had an auto electrician have a look at her and after all his checks he has established that the ECU has lost the wil to live ,
The reason for the buzzing relay is the ecu is only putting 6 volts to the relay for the fuel pump therefore caulsing partial operation.
So now i want an ecu for a 3.5 efi hotwire !
Thanks for you're help !
Posted: Thu Aug 28, 2008 6:30 pm
by SteveRK
Hmm - a logical diagnosis for an engine that stops running but i would suspect either a missing coil - feed connection (black with white trace) with 6.8KOhm resistor fitted in series or some other sensor input to the ECU.
On hot-wire engines the fuel pump runs for a few seconds at ignition on and then stops. It only re-starts when the engine is cranking to start.
Posted: Sat Oct 18, 2008 2:23 pm
by bodger
http://www.g33.co.uk/fuel_injection.htm
have a read here , " inital start up " section