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

There is a relay box located up underneath the drivers side dash. Jan 31 2020 If the engine still wont start the most likely culprit is a lack of compression.

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This is used by the computer to determine the amount of gas to inject.

. Available 7 Days a Week. Dont let the name fool you it can even malfunction when its warm. Could be any of an assortment of problems.

Problem 1 can be attributed to a lot of things. This could cause your car battery to drain. If i go for a long drive and the car gets up to temp middle of the gauge and then i stop to go in a store and come back within 5 minutes it will not start back up.

Up to 8 cash back The engine running hot could be any number issues ie. Ill describe my hot start issue. Make sure you got enough fuel pressure and good spark.

A failed cold start valve will keep your car from starting when the engine is cold. Related questions 0 votes. Probably the most common reason why a car wont start is dead battery.

This isnt really a problem with newer models as most new cars are fitted with fuel injectors. Just wont start when hot but will start when cool. The car drives smooth good responses idle RPM is stable.

But on days that I drive to work and park the car at the end of my shift the car wont start and has taken various tines anywhere from 45 minutes to 4 hours to start. It has driven from northern California to Las Vegas San Diego and LA and back without overheating once. My 2000 Expedition runs good but if I drive it to the store and turn it off when I get back in and turn the ignition only the dash and radio come on but no engine or clicking noise like a starter.

This of course will make it more difficult for your car to start. Oh wait no you wont your car wont start again. The starter is fine hot or cold it just wont start the engine unless cold.

Before you condemn the starter as bad you should perform a system diagnosis of the battery cables and starter. Car wont start when engine is hot. Well the embarrassment and inconvenience of having a car that wont start in the heat or after the engine bay has heated the wiring from driving around isnt something you have to live with heres why.

Likewise a bad crankshaft position sensor wont send the right signals to the engine computer to allow the engine to start. Car will keep running for long miles smoothly if dont shut off the engine. If you open the hood youll probably see coolant fluid leaking.

No Need to Step Outside. Ok so normally it seems that peoples cars wont start when its cold but my car does not like to start when it gets HOT. As others have said in older cars there were issues with vapor lock ie.

If your car wont start after overheating theres a good chance you have a blown gasket which is a very serious issue. Faulty Cold Start Valve. Water pump restricted radiator thermostat replaced already inoperative cooling fans restricted exhaust ie.

The car cranks slowly slow enough that it wont start. I recommend having your vehicles no start and running hot issue be diagnosed and repaired by a certified technician such as one from. Why WonT My Car Start But The Battery Is Fine.

This happens all of the time when it gets hot so why worry. Car wont start when its hot outside. If its too hot I have to open the hood then crank it for a little.

The most common source of trouble when the engine cranks but wont start is the ignition or fuel system. It is sometimes necessary to replace the starter if the connection is loose. I have replaced all the fuses the fuel relay and it still happens.

Runs perfectly when it does. 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. Every morning my car starts no problem.

A bad injector can throw the entire fuel system off and keep the engine from firing especially when the engine is warm. Ill have to crank it for a while. For example you would have kept the headlights on while parking and forgot to turn them off.

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. If the starting charging and fuel systems are working the problem could be inside the engine. 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.

It is a small box about 1 wide by 2 length by 1 depth. Go to this link for a picture and location. However a defective ICM could cause erratic powerground voltage to the sensor leading to inconsistent crank readings.

Why wont my car start when its hot outside. Why will my Pathfinder will not start when engine is warmhot asked Aug 15 2017 by sally. If your engine gets too hot certain vapours can cause obstructions which can make it harder for fuel to circulate.

Why wont my vw jetta start when its hot from the sun just sitting there. Overheating is usually caused by a problem with the coolant system. If your starter easily cranks a cold engine but drags or cranks very slowly when hot there may be a heat soak problem.

Your car battery can drain due to many reasons. Car runs great however recently when it has been very hot outside the car wont start it will start as a low idle then eventually get only the click as it tries. Also a faulty sensor crankshaft position sensor or camshaft sensor on some models or throttle position sensor may cause this problem as well.

0 answers 88 views. 1 Year12K Mile Warranty. Certified Mechanics Fix Your Car in Driveway.

A broken timing belt timing chain or timing gear means you can crank the engine until you drain the battery and it still wont start. Keeping your engine at the proper temperature is vital to keeping it running correctly. A car engine would keep on gaining temperature until a while after it was shut off.

I always have to leave the hood open for 20 minutes to cool the engine down and then the car starts with no problem. Im not sure what to check it seems to only happen when it is very hot inside the car. Ad All Makes Models.

Asked Jun 17 2018 by anonymous. 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. If it is inaccurate when hot but ok when cold the computer will not inject the correct amount of gas when the engine is hot and the car wont start.

The first thing Id probaby check is the engine coolant sensor.

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