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'04 Excursion has hard starts and low power
Truck is 2004 excursion with 134,xxx. I finished up a pretty complete top end rebuild on this truck last week. This included ARP studs, HGs, oil cooler, egr delete, injector test/clean (they all came out good), fuel filters, water pump, thermostat etc. I tested the FICM before I started any of the work and it tested good.
On the first few initial cold starts after the work was done It would crank for 5-10 seconds before starting. I attributed this to air in the HPOP/Fuel System after letting it warm to operating temp inside the shop, It would start much quicker but still seamed to be a little rough immediately after start then smooth out a second or 2 later. I test drove it on the stock tune and everything seamed ok. I then loaded up the street SCT tune. Damn it was impressive! Then loaded in the power tune and again, WOW! So at this point I figure its all good and the truck is fixed.
My Biz partner drove the truck for the weekend and on mon I went on an errand and noticed it seamed to be down on power. I mentioned it to my partner and said I'm crazy. Ok whatever...
This morning I came in and he says , "the truck is ****ed up". Great... Apparently he couldn't go over 50 on a slight uphill on the way to the shop this morning.
Keep in mind that this whole time it always seems a little funny immediately after start up. Just slightly rough then smooths out and all good.
Checked for codes, and checked boost with sct. Im getting 29psi under WOT and no codes. Then I loaded in the stock tune to compare and it became a very hard start. after it starts it idles smooth.
I rechecked FICM and it is still 48v all the time. I'm a little scared that this may be a HPO system leak, I dont want to tear this thing apart again!
What do you guys think? What other components can I test?
THANKS IN ADVANCE!!!