David Martin
New Member
I've had my 3.9 off the road for a few bodywork repairs. Everything was fine beforehand but on trying to get her started something very stange is happening...
If I connect up the battery and turn on the ignition I get a hum from the fuel pump for a few secords (so far so good) but when cranking there's no power from the main fuel relay and it won't start.
If I disconnect the ECU (while the battery is connected, but with the ignition off) and then reconnect I get feed to the pump and it start up fine.
After a short while - anything from 10 seconds to a minitue or so - it will cut out (still got power to the fuel relay at this point). When I try to restart it I'm back to square one - it primes the pump but doesn't energise it while cranking and I have to disconnect/reconnect the ECU to get it running.
I've done all the checks listed in the Haynes manual and everything checks out (feed to the ECU, sensor reading etc.). Also checked the ignition and getting a good clean trigger from the ignition module and a nice fat spark.
Any ideas because I'm stumped!!
If I connect up the battery and turn on the ignition I get a hum from the fuel pump for a few secords (so far so good) but when cranking there's no power from the main fuel relay and it won't start.
If I disconnect the ECU (while the battery is connected, but with the ignition off) and then reconnect I get feed to the pump and it start up fine.
After a short while - anything from 10 seconds to a minitue or so - it will cut out (still got power to the fuel relay at this point). When I try to restart it I'm back to square one - it primes the pump but doesn't energise it while cranking and I have to disconnect/reconnect the ECU to get it running.
I've done all the checks listed in the Haynes manual and everything checks out (feed to the ECU, sensor reading etc.). Also checked the ignition and getting a good clean trigger from the ignition module and a nice fat spark.
Any ideas because I'm stumped!!