Help please! 2003 Ford Crown Victoria wont start!

ford
crownvictoria

#1

My 2003 crown Victoria will randomly not start. By not starting, I mean that I have power to lights, windows, etc and when I turn the key it goes on temporarily, for about 1-2 seconds, and then shuts off. If I crank the engine and hold the accelerator giving a steady amount of gas the car will stay on but once I remove the gas it shuts off. This has happened about 4 times now and every time it has happened I just let it sit with the key out for about 10-15 minutes and the car starts up no problem. Any ideas what could be wrong? The car has a new alternator and the battery was checked and is at 100%. Thanks in advance for your time.


#2

The problem is most likely with the Idle Air Control valve.

https://www.rockauto.com/en/catalog/ford,2003,crown+victoria,4.6l+v8,1410567,fuel+&+air,idle+air+control+(iac)+valve,6072

The IAC valve allows the engine to idle anytime the accelerator pedal is released.

One way to determine if there’s a problem with the IAC valve is, the engine doesn’t stall as long as the accelerator pedal is depressed.

Tester


#3

If that was the issue would the car normally start most of the time? I am able to start the car 100+ times before i have this issue happen. Also, how do I test if the IAC is bad? You say make sure the pedal is depressed and if it does not stall then it should be okay?


#4

Locate the IAC valve on the throttle body.

Start the engine and let it warm up.

Take the handle of a screwdriver and rap on the IAC valve.

If the engine idle speed changes, replace the IAC valve.

Tester


#5

Ok thank you. I will try this out soon and get back to you


#6

Checking fuel pressure while in failure mode will rule out a bad pump. My experience for whatever reason with fords of this era, pumps fail while the engine is hot, let it cool and starts right up.