DefNC Posted June 21, 2022 Share Posted June 21, 2022 Hello, I converted my defender 90 TD5 into a V8 3.9L efi. This engine came from a 1992 Range Rover Classic. Engine number 35D.. The project finally done but I had a lot of problems afterwards despite replacing a lot of parts for rehabilitation. : Full Cooling system, break servo, alternator, complet SS exhaust ligne, full ignition parts ( magnecor leads, spark plugs, bosh coil, Lucas OEM Distributor with RPI cap and arm) New Injectors with rebuild electric wires with new connectors. Did the same for Fuel and water temp sensors. New fuel pressure reg, with new OEM in-tank fuel pump, new MAF, stepper motor, Throttle pot. All those devices have been settled at the correct Voltage. After a few driving, my engine beginning to have some cut-off. Then, to be very often until finally doing it all the time. The idle is perfect, good restart, Reaches the high RPM with brief accelerations but, if you keep it in high, it cutting-off and stall. I bought on Ebay a new 14CUX in very very good condition. But doing the same as my old unit. The problem is not from the ECU. I tryed with an other fuel pump. It's an external unit 3,3 bar pressure. It's not that. I plug my coil directly on the battery + to feed permanently curent at the spark plugs. It's not that. Can you tell me more about vacuum system ? the T piece for exemple? mine is only empty, nothing special like no-return valve ? I think about the wiring loom ?Maybe something happened during the engine is running ? maybe an air leak somewhere ? I'm looking for new ideas, suggestion or your experience to try to make my engine ready for fun. Thank's LR4X4, thank's for your help. Cheers from New Caledonia. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 21, 2022 Share Posted June 21, 2022 Ignition amp on side of distributor? 1 Quote Link to comment Share on other sites More sharing options...
Junglie Posted June 21, 2022 Share Posted June 21, 2022 No answers, but your installation looks lovely... Watching closely for lessons I'll need to learn when I do mine. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted June 21, 2022 Share Posted June 21, 2022 5 hours ago, Bowie69 said: Ignition amp on side of distributor? I second this, they love to die with heat so will start fom cold and then get weaker and weaker. Quote Link to comment Share on other sites More sharing options...
Escape Posted June 22, 2022 Share Posted June 22, 2022 If the above doesn't fix it and the idle is good, have a look at the throttle position sensor. They can develop flat spots with age, causing the engine to lose power or cut out. Quote Link to comment Share on other sites More sharing options...
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