I have a 1992 GS300 turbo with a very irritating intermittent fault. The engine will not restart after a run of says 20min. This doesnít happen all the time, just most of the time. The engine will turn over and cough into life but will run very roughly for about 45 sec then die. Or, the engine will run sweetly for 3-6 sec then die.
I have replaced the fuel filter, map sensor, fuel computer, engine computer, and fuel pressure regulator. None have solved the problem.
Currently the fuel pump is powered by a 12volt supply from the air purifier located in the boot. I have put a voltmeter across the plug terminals of the fuel computer and have noticed that there is a large voltage drop when the pump dies and I think itís from the main 12v feed to the fuel computer.
My question is (and I hope like hell that one of you will know). Where is the fuel relay? Iíve got this funny feeling that the fuel relay could be the culprit. Why? Cos the other day my friend suffered the identical problem in his BMW E36Ö. the fault was a dodgy fuel relay.
Any help would be dearly appreciated