Slow Start. STC fitting?

[Turb0]

My truck has been having a slow start problem since i bought it last year. It usually takes around 5-7 seconds when cold or first start, when warmed up it speeds up a bit but never fires right up. If i look at the ICP pressure on my EDGE when cranking, the pressure usually lingers around 45-50psi for most of the cranking time, once the pressure builds past that it starts up. Could it be my STC fitting or am i looking in the wrong direction?

[sinner6.0L]

could be the STC but for what you're describing I'd suspect the o-rings on the dummy plugs first. For some reason I've seen more of those cause a long crank but still starts

you do have an 05-07 correct?

[Turb0]

Yes, my truck is a 2005.

[Banshee365]

'05's are known for STC problems. Listen to the tech above and look after the dummy plugs and standpipes but you should also change your STC fitting with kit# 4C3Z-9B246-F from Ford. If would be in your best interest to change this part out now before it causes you real trouble. If it blow's on the road the truck WILL shut off and will not restart until it is fixed. You won't be going anywhere with any amount of duct tape IN THE WORLD! Also, if it blow's it can possibly crack your rear engine cover keeping even more food off the table from repair time. Spend the $40 for the kit and replace that along with your dummy plugs and your issue should go away (as long as your batteries are good.)

The only other thing that can cause your starting issues is your FICM.

[sinner6.0L]

I agree, as long as your digging around replace all of the high failure rate parts. I'd get a new hpop connector in there and new dummy plugs and standpipes, all have been updated since the truck was built. After that if you haven't found anything obvious it may be time for an air check.

A ficm can also cause some starting issues but won't be related to the slow to build ICP

[Turb0]

Will do. As soon as I get my Grand National back on the road I'll put the truck out of commission for a weekend. Hopefully within the next few weeks. Any suggestions on where to get all the parts from? I plan on doing all you guys suggested (dummy plugs, standpipes, and STC fitting). I would prefer a one stop vendor with good prices.

Thank you guys for the input.

[sinner6.0L]

tousley ford parts sells at 10% over cost and that's what I pay. You'll have to pay shipping but it's still a hell of a deal

[Turb0]

Just looked up Tousley Ford and their prices are really good. Now i just need part #'s for my project. I think i have the right part# for the STC kit: 4C3Z-9B246-F. Now i just need the part #'s for standpipes and dummy plugs. Thanks in advance for the info.

[Banshee365]

These could have been updated but here's a few numbers I have for what you're looking for:

Dummy plug: W302908
Stand pipe: 6E7Z-9A332-A

I usually use Tasca Ford Parts and they've been great to me. TascaParts.com

[WarChild]

I dont have to worry about stc fittings correct?