why won't my car start when the engine is hot

The car drives smooth good responses idle RPM is stable. If your starter easily cranks a cold engine but drags or cranks very slowly when hot there may be a heat soak problem.


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Remove one spark plug wire at a time and check for spark on the engine with a spark tester tool.

. Relieve fuel system pressure. Car will start normally after cooling off generally takes at least 45 minutes. If the engine crank fails when you press Start in your push-start system car its possible your key fob has issues or is dead.

You can do a very simple evaluation for engine damage. Car wont start when its hot outside. No problem driving to work parking all day.

Before you condemn the starter as bad you should perform a system diagnosis of the battery cables and starter. The car cranks slowly slow enough that it wont start Problem 1 can be attributed to a lot of things. The most common reason a car is hard to start when warm is due to a defective crankshaft or camshaft position sensor.

This of course will make it more difficult for your car to start. Modified 5 years 6 months ago. Just wont start when hot but will start when cool.

When the engine is too hot fuel cant circulate properly due to the way in which vapor obstructs it and therefore the engine wouldnt start as easily as it should or it wouldnt start at all. I recommend having your vehicles no start and running hot issue be diagnosed and repaired by a certified technician such as one from. 1995 Buick Regal 128k miles 38L V-6.

A defective sensor wont transmit the correct reluctor wheel signals back to the ICM and ECM causing improper or no spark leading to engine stalling or misfires. However it could also be caused by a clogged air filter faulty battery connection vapor lock or a bad ground connection. Truck wont start when sitting for 8 hours in cold but will.

It is a small box about 1 wide by 2 length by 1 depth. Pressure and injector pulse are good even on no start. To relieve pressure proceed as.

This isnt really a problem with newer models as most new cars are fitted with fuel injectors. Car wont start after driving. 1990 Ford F-150.

With a dead key fob battery the button wont receive any signal from the key fob and your car wont start. There is a relay box located up underneath the drivers side dash. Here is what I know.

Why Wont My Car Start. The most common causes are problems in the ignition for example a bad ignition coil or fuel system for example a clogged fuel filter. Vehicle cranks has spark has fuel pressure at fuel manifold.

Fp was bad replaced pump and sending unit fuel filter pressure regulator and TPS. As others have said in older cars there were issues with vapor lock ie. Fuel with low alcohol or using the premium fuel is the only one solution to stop the fuel lines to freeze.

Refer to steps 1 through 3 above. Besides the fuel lines freeze and when condensed with the change in temperature only water is left everywhere. Diesel engine wont start when hot.

No codes on computer Wish it was a 96. Injector pump and or injectors or collapsing or leaking fuel lines when hotThere is also a slight chance that the valves are set too tight and when hot do not close properly but the chance of multiple cylinders to have the same problem is slim if it is only one or two valves that leak the engine. Probably some nasty damage to the engine.

Dead Key Fob Battery. Up to 8 cash back It sounds like the ignition coils are getting hot and when the engine is shut off the engine will not restart due to an ignition coil that will not produce a spark. Shut off truck after driving it will not restart until it cools off.

FUEL SYSTEM PRESSURE TESTING Before servicing fuel system components fuel system pressure must be released. Start engine and check for fuel leaks. If the tool is adjusted to 30 thousandths and the spark starts jumping around then the coil.

Up to 8 cash back The engine running hot could be any number issues ie. When your engine cranks but wont start or run it could mean your engine is having trouble producing a spark getting fuel or creating compression. However a defective ICM could cause erratic powerground voltage to the sensor leading to inconsistent crank readings.

Disconnect battery then put a socket and ratchet on the crank-bolt and turn the ratchet clockwiseit should move with some. If the engine turns over but does not start the problem might be with the fuel supply. Car will keep running for long miles smoothly if dont shut off the engine.

Go to this link for a picture and location. Remove fuel pressure gauge and reinstall fuel lines. A car engine would keep on gaining temperature until a while after it was shut off.

Start engine and observe fuel pressure. Moreover in normal days water could be filled in fuel lines while car washing or something else. Its been 2 months over and over tested that in the warmed up condition loose the fuel valve top of the fuel filter a little gasoline spill put the ignition key to ON position dont see.

It should be 9 to 13 psi. Ask Question Asked 5 years 11 months ago. If your engine gets too hot certain vapours can cause obstructions which can make it harder for fuel to circulate.

It doesnt overheat and it cranks fine no drag just wont start. Viewed 9k times 4 My Ford forgo 2012 diesel refuses to start after driving long distances but it usually starts well when it is cold. The fuel in a line that got hot and vaporized the fuel such that the fuel pump could not draw enough fuel due to the bubble in the line.

Water pump restricted radiator thermostat replaced already inoperative cooling fans restricted exhaust ie. When running errands around town car will temporarily not start after 3rd or 4th stop.


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