Hot start problems

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Oct 22, 2009 | 06:32 AM

#46

subford

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Joined: Aug 2005

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From: Easton,Ks

Quote:

Originally Posted by TexasGuy001

The IAT goes in the air filter box on mass air trucks. If you have a speed density truck, I don't believe you have this. I think it was only on mass air trucks. Seeing as how you have a MAP, your truck is speed density. I believe all the 460 trucks were speed density. Where is the IAT located on the 460?

The IAT is at location F6 in the diagram below for the 460 with a MAP sensor.

Oct 22, 2009 | 06:55 AM

#47

TexasGuy001

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That is interesting. I didn't know it had one. I should have known better.

Oct 22, 2009 | 12:13 PM

#48

blackchr

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Quote:

Originally Posted by TexasGuy001

I had a similar hot start condition that a few shops and 2 Ford dealers could not figure out. An SVT mechanic even looked at it. It turned out to be the injectors. They would leak fuel into the engine and flood it out when the engine was shut off. I just replaced all of them.

The problem my F150 had was it would start fine when cold, but after being driven it would be very hard to start unless you started it back up within a few minutes. It would normally have to sit for a few hours or longer before it would start normally.

I'm pretty sure it's not this, my regulator went out a few weeks after I bought it, so I got $900 worth of new injectors. I've been told afterwards that I probably didn't need the new injectors, but at that point the shop didn't know the regulator was bad, they just said my injectors leaked. After I still had problems with new injectors, they found out I had 140psi to the fuel rail, which was causing even the new injectors to leak.

Oct 22, 2009 | 12:15 PM

#49

blackchr

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It's already been covered, but yes, I have an IAT. I know because I already replaced it

I'll try the penny in the EGR thing. It can't hurt! Thanks for the suggestion!

Oct 22, 2009 | 12:21 PM

#50

subford

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From: Easton,Ks

Quote:

Originally Posted by subford

OR unscrew the big tubing nut at the bottom of the EGR valve, drop a penny in the tube and had tighten the tube back on to the EGR valve.

That should have read:
drop a penny in the tube and hand tighten the tube back on to the EGR valve.

This so you do not mess up the tube to valve mating surfaces.

Oct 27, 2009 | 01:09 AM

#51

blackchr

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EGR didn't appear to change anything, so I'm selling the truck. I may try again with another one once I have an actual place to work on it.

Thanks for all your help!