7.3 wont start when warm
Thread Starter
|
Junior User
Joined: Sep 2004
Posts: 71
Likes: 0
7.3 wont start when warm
Hey guys just turned 100,339 mile in my 7.3l. Basically engine starts when cold, but when it gets warmed up and i turn the engine off, when i go to start it again, it often will not start. this doesnt happen every time. I turn the key the glo plugs come on fuel and oil pumps come on, but when i go to start it no power gets to starter. maybe alternator?? I just had it into ford for the cam sensor recall, and was maybe wondering if that had something to do with it. any suggestions are appreciated.
Freshman User
Joined: Sep 2006
Posts: 30
Likes: 0
From: jacksonville .Fl.
starter
does it spin fast or slow like the batteries are low ,if slow take starter off and jump it with jumper cables and see if it still spins slow ,if so then get a new starter ,very common problem .
Trending Topics
Hotshot
Joined: Feb 2007
Posts: 10,499
Likes: 10
From: Sterling Heights,Mi
Hey guys just turned 100,339 mile in my 7.3l. Basically engine starts when cold, but when it gets warmed up and i turn the engine off, when i go to start it again, it often will not start. this doesnt happen every time. I turn the key the glo plugs come on fuel and oil pumps come on, but when i go to start it no power gets to starter. maybe alternator?? I just had it into ford for the cam sensor recall, and was maybe wondering if that had something to do with it. any suggestions are appreciated.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Logistics Pro
Joined: Jul 2001
Posts: 4,137
Likes: 41
From: Marble Falls, Texas
Just to think out of the box, if it's an auto, sometimes the gear selector has slack and won't let the starter click over. But if you hear the starter solinoid click, most likely a bad connection, or starter.
Post Fiend
Joined: Sep 2006
Posts: 5,584
Likes: 0
From: Millbrook Alabama
to expand on why I suspect the batts, when your truck sits for a good while the batts naturally have a tendency to regain some of their lost charge, this explains why its eaisier to start when cold, it has more than 10.5V going to the IDM which is the minimum required. Your Alternator is also probably failing. Once you get it started the truck runs off the voltage that is supplied back to the batts from the alt., but its not enough to charge the batts and run the IDM (the IDM takes between 10.5 and 12V and converts it to 120V+ to fire the injectors.) remove batts and have them load tested seperatley. If they check good, then have the alt checked. Only replace batts in sets of two, and if the alt shows bad and this has been happening awhile, replace batts and alt. a failing alt can damage good batt cells in a short time.
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
is it the relay on the inner fender clicking or the starter solinoid?
when you get a no start try jumping across the big post on the relay
if it starts then try jumping from bottom large post to small post
when you get a no start try jumping across the big post on the relay
if it starts then try jumping from bottom large post to small post
Thread
Thread Starter
Forum
Replies
Last Post
1'stonraceday
Cooling, Heating, Ventilation & A/C
5
Dec 26, 2012 10:12 PM
jeem
1999 - 2003 7.3L Power Stroke Diesel
10
Feb 6, 2011 11:10 PM
kdokey
1999 - 2003 7.3L Power Stroke Diesel
6
Dec 29, 2009 12:36 PM