Hey guys,
I have a 2002 exc with the v10... my problem is that when I start it, it will fire up and die. Then, it will crank and not start for 10-15 minutes. Once it fires up, it runs fine. But, if i turn the key on & not crank it untill the fuel pump primes, it starts right up and runs fine. This wasn't the case when I first got it 4 or so years ago... used to be able to crank & go. So, is this an indication that my fuel pump is going out?

thanks!

 

Pump or regulator. Check fuel pressure.

 

I finally checked my fuel pres. With the key on, motor off it was 38psi. Motor on 33psi. When turned off it held pressure. I changed the fuel filter... when i relieved the fuel pres, it built pres as soon as the key was turned on & before i heard the pump cycle? IDK. It's not throwing any codes. It may not have anything to do with the fuel system.

 

How many miles?
When the ignition switch is first turned from OFF to RUN, the fuel pump power relay is turned on by the PCM for 2-3 sec to prime the fuel rails.
When the ignition switch is turned further to START, the PCM reads the Crankshaft Sensor and turns on the fuel pump relay to run the engine.
Not sure, but seems logical, with the engine turning the Crankshaft Sensor and ignition switch back in RUN the PCM continues to enable the fuel pump relay.
Check the Crankshaft Sensor wiring and connector for issues.
With 38 psi and the motor off you don't seem to have any leaks from a stuck injector.
I never hear our pump, but I'm not sure how yours "built pressure as soon as the key was turned on & before you heard the pump cycle".
I don't think there are any codes for the PCM to set related to fuel pressure, but it may be able to tell if the fuel pump relay coil is bad.
If you have 38 psi with motor off and 33 psi with it idling that doesn't seem quite right.
Ours has around 40 psi idling and slowly drops off over 2 days down to 10 psi or so.
In 2002 the fuel pump relay was relocated to under the CJB (fuse panel) - not a convenient location.
The contacts of the fuel pump relay may be corroded not allowing full current to get to the fuel pump and run at proper rpm.
As a test you could run a wire from the battery to the Inertia Switch connector to bypass the fuel pump relay and see how if affects starting.
The PCM "controls" several things like plug coils, fuel injectors, & relays not by "powering" them, but by completing the circuits to ground.
It is important the PCM grounds are clean and not corroded.

 

Thank you!
I will work on that next weekend! I will re-check my fuel pressures to make sure the information I gave you is right. Check the crank shaft sensor & PCM grounds. Thanks for the leads... I was getting discouraged!!

appreciate it.. will post results next weekend!

 

hey now..
I rechecked my fuel pres this morning. Key on , motor off 36 psi. Motor on 32 psi. When i turn the motor off it slowly builds to 38 psi...? & holds pressure. I did this several times to make sure it was consistent. The pres built as soon as I turned the key.. the sound im hearing, i think, is the pump grinding down at the end of the cycle. I went a head and replaced the crank shaft sensor... because that made the most sence. Since the fuel pres is on the low side of normal and making a noise, im going to have the fuel pump replaced... just because. All morning, after replacing the crank shaft sensor, it has started without any problems... but it sometimes did, & sometimes didn't. If it doesnt start right up.. i will post.

thanks again!

 

It has been a couple of weeks since I changed the crank shaft sensor. The truck has started fine since!

thanks R&T Babich!!