'99 & up 7.3L Power Stroke Engine and DrivetrainDiscussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
I have this 2003 Diesel 7.3L very hard to start when cold. I just put in 2 new battery and when the weather very cold it won't start, the starter can't turn over fast enough. when i plug in the engine warmer electrical the truck would start ok. The problem when i leave home it wont start if i park too long. Anyone have any similar problem like this, would the starter go bad that can cause this problem or the glow plugs?
Then, if you are sure your batteries are well charged (possible alternator issue if they aren't) and that all your connections are clean and tight, then you need to replace your starter. When and if mine goes out, I plan on replacing it with this one:
Have your Alt checked to just make sure. But it sounds like the starter to me.
My guess, is you replaced the batts because it was not cranking over good. You put them in and it probably cranked over fine. Then shorty after it went back to the same old poor cranking. Thats what mine did. Replaced the starter and problem solved. But my starter about a week after putting the new batts in sounded like a garbage disposal grinder HA! So it was pretty clear what the problem was.
2002 Excursion 7.3L 200K+, After market tranny cooler, diesel site transmission filter kit, coolant filter kit and complete boot kit, bilstein shocks. Original transmission with mobile syn ATF
If your running 15w-40 oil that could be the problem. When it really cold it gets really thick. I'm using the Rotella T5 5w-40 synthetic and the engine cranks over and starts way better than it did with 10w-30 Dino oil I used to use in winter.
1999.5 F-250, 7.3L powerstroke diesel, extended cab Super Duty,short box, 8'-6" Fisher XTREMEV snowplow,Hypertech power programmer III,Banks Trans Command,Detroit locker in rear end,6 disc cd changer,brush quard,2 1/2" Tuff country leveling kit in front,285/75/16" ,Goodyear MT/R with Kevlar tires on MB wheels,Rancho RS9000X shocks