I will drive my car for 15 minutes or more, shut the motor off and it will not start. It turns over great but will not fire up. I must leave it for 15 to 20 minutes before it will start again. I had the engine computer changed and the problem still there. 1.8 motor, automatic, 78,000 miles, Corolla CE.
looking for help, thanks
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Could be vapor-lock. When you shut it down fully warm, heat can cause the fuel in the lines to boil, making it hard to start. Low fuel pressure can make the symptoms worse, as full pressure will condense the vapor, and get your fuel flowing.
I would check fuel pressure while running, and again, during the time when it doesn't start.
When electrical component such as a crank position sensor or even a cam position sensor warms up it develop high resistance. That why if you let is sit that component cools off and resistance becomes low.You have a ignition control problem this stem from ICM (If equipt) to cranksensor to camsensor,
Your vehicle uses the coolant temp sensor and the intake air temp sensor to determine the engines temperature on a cold start. If one of them is dramatically different than the other it will flag a code.
Is the check engine light on?
When was the last time you had a tune-up? if recently what brand of plugs where used?
Have you noticed any hard start issues after a hot soak? A hot soak would be driving the car until fully warmed up, shutting of the engine for approximately 15 to 20 minutes, and then starting the engine again.
a likely problem is a fuel pump going down...as it gets warm, it heats up the wiring inside and they expand causing a loss of connection inside the pump...As it cools, it comes back together and works again...when it dies out turn the key off and listen closely for the pump to hum when you turn the key on...If it doesn't wait for it to cool and then when you try again listen and if you hear it and it starts, that's your problem...fuel pumps will go bad quickly if you don't keep your tank at least a quarter to half full as the gas is what keeps it cool so it don't get too hot and melt the shellac on the wiring which will eventually short out...
Definately overfueling. Don't apply any gas pedal when starting. lightly tap and crank. If still does it, fuel pressure regulator malfunction- good luck It should fire up without give it fuel. not like the good ole cars.
Is the check engine light on? do you have the A/C going when it
happens? Is the car running hot? Possible places to look would be the
intake air temp sensor, or the idle air controller. (if applicable). I
have heard that some cars will kill the motor if the fan switch has