Lump Posted September 24, 2011 Share Posted September 24, 2011 After much fluffing about I've finally replaced my V8 with a fuel injected Jaguar six cylinder engine (from an XJS) and got it sort of going I set the timing correctly (according to the manual) and finally got the engine to run today without backfiring out the intake manifold. It ran fine briefly, on starter fluid. When I reconnected the fuel pump and restarted the engine - it wouldn't shut down when I switched the key off, it did stop shortly after I tripped the fuel pump inertia switch to stop the fuel flow. Does anyone have any ideas why this happened? Is it possible the ignition on relay for the ECU got stuck in the on position? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted September 24, 2011 Share Posted September 24, 2011 Try disconnecting the alternator and try again - you may be getting a feedback via the alternator and thus not allowing the engine to shut off.. Quote Link to comment Share on other sites More sharing options...
Llama Posted September 25, 2011 Share Posted September 25, 2011 ^Sounds like the most likely cause. Otherwise see what else is connected to your ignition circuit that could be delivering power. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted September 25, 2011 Share Posted September 25, 2011 that dosn't sound like dieseling, its sounds like your pump is still delivering fuel when the key is turned off, if you can find another source of power as mentioned, maybe look at the actual ignition and give it a clean/replace Quote Link to comment Share on other sites More sharing options...
Lump Posted September 25, 2011 Author Share Posted September 25, 2011 Cheers Guys, you're all right, I'd conected the ignition on relay for the ECU to the wrong point on the fuse box, so rather than getting a 'key on 12v' source it was getting an 'engine running 12v' source - so the ECU ignition on relay kept the car running on the power produced by the battery/alternator. I've got it hooked up right now and she starts and stops on the key. A bit more work and she'll be able to move under her own power Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted September 25, 2011 Share Posted September 25, 2011 i do love a quick resolution, good work Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted September 27, 2011 Share Posted September 27, 2011 Try disconnecting the alternator and try again - you may be getting a feedback via the alternator and thus not allowing the engine to shut off.. That's exactly what happened to me. I put a diode in the wire that feeds 12v to the bulb to stop the back feed Quote Link to comment Share on other sites More sharing options...
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