2004 V10 hard start when warm
Thread Starter
|
New User
Joined: Feb 2014
Posts: 21
Likes: 0
From: New Haven
2004 V10 hard start when warm
Hello all, I'm new to the forum because I got a new to me 2004 4x4 Excursion v10. 98,000 miles and I am out of ideas as to why it is hard to start when the engine is warm. I originally posted the the V10 forum and I tried to do a forum search but could not find the same issue, both with no luck. Starts right up when cold, engine not ambient air temp, idles great once started. In park idles at 1,000 until normal op temp is reach, then down to 750ish. In gear idles right at 650. Drives great. Plenty of power, does not surge, averaging 13.7 mpg over two tanks (70% hwy, 30% city) and no codes. Since it is new to me, and I don't trust people to do maintenance I have:
Replaced spark plugs
Replace downstream o2 sensor (the two upstream were not in stock)
Replaced fuel filter
Replaced belt
Replaced crank sensor (because the belt was already off)
Changed oil (mobile 1 5w20) and filter.
Any help would be greatly appreciated.
Replaced spark plugs
Replace downstream o2 sensor (the two upstream were not in stock)
Replaced fuel filter
Replaced belt
Replaced crank sensor (because the belt was already off)
Changed oil (mobile 1 5w20) and filter.
Any help would be greatly appreciated.
Bleed Ford Blue
Joined: Apr 2009
Posts: 13,578
Likes: 157
From: Anchorage Alaska
Hard to start issues make me think of low fuel pressure? Have you checked it?
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
How many miles on it? Have you ever replaced the fuel pump? I would probably replace mine if it had a ton of miles.
Trending Topics
Posting Guru
Joined: May 2012
Posts: 1,758
Likes: 3
From: Colorado
fuel pump. Check the fuel pressure. Loan a tool from your carparts store and check the pressures when cold and when warm. Running as well as key on engine off.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Thread Starter
|
New User
Joined: Feb 2014
Posts: 21
Likes: 0
From: New Haven
Hey guys, thanks for the input. Here is the update. Narrowed the pressure tester from autozone. Got it home and discovered the Ford fitting for the gauge came pre-stripped. Since the round trip was going to take me to almost empty decided to play the odds and changed the fuel pump discovering two things.
1) it had been changed before (AC Delco)
2) they put the assembly in backward. Not that that would matter for my problem, but I'm glad it is now retained like it should be.
Results: It helped, will consistently fire after cracking (normal crack speed) for about five seconds. I did notice that every time I let the system charge 8-10 seconds before cranking I hear air purge from the system. Is this normal on the v10?. I'm thinking maybe the pressure regulator is letting fuel drain back to the tank. Will clean the maf and iac Friday and let you all know what happens.
1) it had been changed before (AC Delco)
2) they put the assembly in backward. Not that that would matter for my problem, but I'm glad it is now retained like it should be.
Results: It helped, will consistently fire after cracking (normal crack speed) for about five seconds. I did notice that every time I let the system charge 8-10 seconds before cranking I hear air purge from the system. Is this normal on the v10?. I'm thinking maybe the pressure regulator is letting fuel drain back to the tank. Will clean the maf and iac Friday and let you all know what happens.
Senior User
Joined: Feb 2009
Posts: 201
Likes: 0
From: Clarksville, TN
Another issue "could" be an intake leak. Heat could expand whatever's leaking causing issues during a hot start? Dunno, just thinking out loud. Some folks have reported having intake leaks on the V10's.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Hey guys, thanks for the input. Here is the update. Narrowed the pressure tester from autozone. Got it home and discovered the Ford fitting for the gauge came pre-stripped. Since the round trip was going to take me to almost empty decided to play the odds and changed the fuel pump discovering two things.
1) it had been changed before (AC Delco)
2) they put the assembly in backward. Not that that would matter for my problem, but I'm glad it is now retained like it should be.
Results: It helped, will consistently fire after cracking (normal crack speed) for about five seconds. I did notice that every time I let the system charge 8-10 seconds before cranking I hear air purge from the system. Is this normal on the v10?. I'm thinking maybe the pressure regulator is letting fuel drain back to the tank. Will clean the maf and iac Friday and let you all know what happens.
1) it had been changed before (AC Delco)
2) they put the assembly in backward. Not that that would matter for my problem, but I'm glad it is now retained like it should be.
Results: It helped, will consistently fire after cracking (normal crack speed) for about five seconds. I did notice that every time I let the system charge 8-10 seconds before cranking I hear air purge from the system. Is this normal on the v10?. I'm thinking maybe the pressure regulator is letting fuel drain back to the tank. Will clean the maf and iac Friday and let you all know what happens.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Verify spark? What's that? You should have changed the boots if you changed the plugs. It could be all you need for quicker starting. I wouldn't do anything else until you change them.