03 fuel pressure ???
Thread Starter
|
Mountain Pass
Joined: Feb 2005
Posts: 204
Likes: 4
03 fuel pressure ???
My 03 expy has been hard to start for the last few months. it cranks strong but it usually will only start on the second turn of the key. also it seems to be a little slugish when you hit the gas. Fuel pressure registers 55psi. this seems high but a ford tech i know says that is "within spec" Also when you turn the key to run the fuel pressure jumps to 55 but falls back to 0 within 3 seconds. I kmow that's not right. thanks for the help!
Senior User
Joined: Jan 2003
Posts: 338
Likes: 0
From: Tucson
Try starting it at part throttle, if it fires right away it is a dirty or bad IAC valve. The throttle blade on these motors is almost fully closed at idle. As far as the pressure dropping off that is normal just not that fast as you found after changing pumps. I believe the idea is for the pump to build pressure, purge any trapped air in the fuel rails and hold pressure while you start since the battery voltage drops off with the starter engaged and the pump performance drops way off. Let us know what happens.
Dave
Dave
Thread Starter
|
Mountain Pass
Joined: Feb 2005
Posts: 204
Likes: 4
Originally Posted by voodoosmooth
Just bought an '03 last week. Had same problem.... turns over fine, but takes a while. Ford replaced the starter, the fuel pump and sending unit. Starts right up now!
Was the starter bad or was this another example of the mechanics guess work?
Trending Topics
Mountain Pass
Joined: Apr 2004
Posts: 168
Likes: 7
From: Northern CA
Under warranty, but honestly, I think these guys are just swapping out parts until they get it right rather than really trying to find the problem.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
rexpedition99
2007 - 2014 Expedition & Navigator
5
Mar 6, 2017 10:17 AM
smamas
Explorer, Sport Trac, Mountaineer & Aviator
13
Dec 11, 2013 11:36 AM
blring
Excursion - King of SUVs
1
Jul 17, 2012 08:42 AM
Golfdad
1997 - 2006 Expedition & Navigator
3
Aug 25, 2011 08:36 PM