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Micahp31

Micahp31 11/17/2020

2002 Subaru Impreza WRX 4 Cyl 2.00L

Engine

Why won't my wrx start when the engine is warm?


I have an 02 wrx. Had been hesitating on acceleration, stalling and overheating. I've replaced fuel system(pump, filter, hoses, fpr, injectors) new air filter and radiator. Air filter, Downpipe and exhaust are aftermarket. Overheating seems to be solved, no hesitation the last 150 miles since repairs. However, the car starts up every time when the engine is cold. When I've driven it and the engine is still warm, I can't get it to start back up till the engine cools. Will fire up but die without any idle. Any idea what the problem could be?

3 Answers


Steve Zavitz

Steve Zavitz 6/22/2022

Sounds like the starter needs replacing

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Jimm

Jimm 6/25/2022

Sounds to me like a fuel pressure problem, so let's do some experimenting...

On a cold start, turn key to ON, but do not crank. Listen for the fuel pump and try to time how long it's on before it shuts off, meaning the fuel system is pumped up to pressure.

Next, on a warm start, do the same. Does it take longer?

If so, then either clogged fuel filter, line or bad fuel pump, faulty fuel pressure regulator, or low voltage to the fuel pump.

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TwelveSixtyNine

TwelveSixtyNine 6/26/2022

he most common reason a car is hard to start when warm is due to a defective crankshaft or camshaft position sensor. However, it could also be caused by a clogged air filter, faulty battery connection, vapor lock, or a bad ground connection.

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