I have an 03 Ranger,4.0. I'm having a problem.Starts up and runs great untill I start and stop a few time's.I have replaced the fuel filter and gas cap,not sure where to go next? If I let it set for an hour or so it will start right up.Any ideas?

 

I would take a look at the fuel pump. I had to do it myself a while back.

 

Change the fuel pump relay in the distribution box under the hood.
Also check the connection to the inertia switch in the passenger side footwell.

 

Clean the IAC valve and mass air.

 

I was thinking along these lines also.

When your truck is warm and you shut it off, does it have a hard time starting again?

 

Only when it's warm and I shut it off and let it sit for a few min. It won't start unless I let it set for over an hour.

 

Whats an Iac?

 

Idle air control valve

 

Clean the air filter, check fuel pump, and run some system cleaner

 

I'm betting my money its your Idle Air Control Valve.
This is what it looks like, i can't find a picture of where its located on a 4.0 But Kevin might know off the top of his head.


All you need to do to clean it is take it off (the two bolts) and then spray the inside out with some Brake and Parts Cleaner untill it runs clean.

 

Brake cleaner will destroy it. Use MAF cleaner

 

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