1999 disco 1 sd starts when cold but when hot wont start, if you floor the gas it starts but stalls, wont start again until at least the engine cools then the idle runs high & then comes down afte

Crankshaft position sensor , maybe . Without test , that's just a guess .

Check for spark on a plug wire when it won't start. If no spark until it cools down, the ignition system is the problem. Could be the coil, the ignition control module (igniter), a crank sensor or pick-up coil, depending on your system, ...some of the most common things to check. If it just stalls, likely lost spark or gas to the engine cylinders. With a new pump, it probably lost spark.

old post , no year car, 1989 to 2002
there are 3 engines, 2 up to 1998. all made by toyota
overheating is it,
forget all else. FIND reason for overheating, coolant lost top list.
if loosing coolant that is #1 above all else. find cause.
but
overheating KILLS all ENgines. if not cured fast.
warps heads
is it pinging? that too kills engines.
your engine should never overheat unless it has cooling problems or.

unless the head is warped now, it will overheat, due to coolant loss
is it loosing coolant every hour or day?
CRANKING ALL ENGINES THAT DONT START DRAINS ALL BATTERIES, IT'S NOT a SYMPTOM IT'S NORMAL FOR NOSTARTS. (starter sucks 100 amps from battery every try)


id do a compression test first.
look for coolant in these spots
1: pavement below car.
2: passenger foot wells. (heat core leaks)
3: low radiator at neck cold show no coolant seen there.
4: in the a/t transmission, turns AFT to chocolate milk.
5: water in the engine oil pan, and or the reverse.
oil in the radiator, or side tank.
do all you can to not overheat any engine, and keep the repair bill like 1/3 or less. of BOOM

Most likely causes are bad engine coolant temp sensor OR leaking fuel injectors. Bad engine coolant temp sensor will give computer false reading and computer provides wrong air fuel mixture. Leaking fuel injectors will load the engine with raw gas--just like flooding it. Try pushing the gas pedal to the floor and holding it there when cranking when hot. That forces the computer into "clear flood" mode and it shuts off the injectors. If it starts up with pedal down, that would be a sign of leaking injectors.

If you mean that it starts fine when cold, but if you stop & turn off the engine (to to pop into a shop for example) then try to restart and get absolutely no turning over, then you need to replace your battery. It has a short or crack which is expanding when hot creating your problem.

Check engine coolant sensor. If it has a problem, it sends a message to the computer that your engine is actually cold and sends more fuel to the engine causing it to run rough or die. After cooling down it will start and run until it warms up then does the same thing again. Just a thought but could be the problem. You have changed your fuel filter correct? And have you checked your fuel pressure?

sounds like coil problem, coils will start cold then get hot and stop. when coil cools will crank up and run till it gets hot, try to replace the ignition coil,dont think it would be a crank sensor, try a coil,thanks robert b.

It is a very bad idea to put cold water in a over heated engine. If you must first start the car and add the water slowly. This will allow the water to mix in with the hot water and not shock the block. But the best thing to do is let the engine cool before adding water. If you add cold water to a hot engine with the engine off and than start it the cold water will pass into the block and could cause the iron to contact unevenly and crack. Good luck.

check to make sure you are getting fuel, when an electric pump heats up they quit working,then when they cool down they might start workig again until it heats up again. or if you have a performance chip in your pcm they short out pull out chip and see if problem is still there