94 Disco 1, 3.9 v8, 5 sp. standard. 175k miles. I have done all the recommended services to the engine. Seafoam Induction cleaning, replaced IAC valve, new LR original Distributor cap and rotor, new Magnacore 8mm wires, Champion plugs, new Accel performance coil, cleaned throttle body. Checked and replaced all suspect vacuum hoses, new air filter and fuel filter. Truck starts quick and runs smooth and powerful....except for one minor issue.

When doing a hot start, like shopping, and getting back in the truck to go, while the engine is still warm, starts right up, then the idle sometimes drops to zero and the truck stalls. Restart, give it a little gas and it works fine again. (All starts are quick...no long cranking) The truck normally idles at between 750 and 900 rpm. This is a minor inconvenience. If I remember to "gas" it a teeny bit after I start then I can "work around" this issue, but it is still puzzling.

 

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I would have to say it is the fuel temp sensor. If it happened when cold it would be different, but it is only hot starts so that is what I would do next.

 

Never happens when cold. Where is that fuel temp sensor on a 94 Disco 1??

 

I belive that it is on the pass side of the engine.
http://www.roverparts.com/TechTips/h...t_problems.cfm

 

Fuel temp sensor is on the fuel rail left side, just behind the oil cap in front of the intake.

It will not leak fuel when changed as it doesn't go through on the fuel rail.

It almost looks like a oil pressure switch.