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 a 2002 F350 7.3 that stops running when it gets hot pulling a trailer. I changed the cps and checked the oil. I can drive it with out the trailer and it does fine but i don't run it hard. Hook the trailer to it and withend 5 miles it will shut off just like I turned the key off and will not restart until it cools off. There is no codes stored. I started it today and let it idle for an hour with no problems. I covered the Rad with a tarp and ran it at about 2000 rpm to heat it up an withend 5 min it shut off with no restart. I shot a small amount of starting fluid in it when it quit an it would hit on it so I think something is getting hot and shutting the fuel off. Any ideals on what i need to look for? Thanks
The IPR valve solenoid can be heat sensitive. Something about electromagnetic coils - they get weaker when hot and one on its last leg can work when the engine is cold and then not have enough oomph to close the valve when hot.
Set your Mac scanner up to monitor ICP sensor data and IPR duty cycle and watch it when it dies - if the ICP data is going down and the IPR duty cycle is going up - might be a good indication. If when you are trying to restart it, you can't get to 500 psi, that's your problem.
2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
"When seconds count, the police are just minutes away..."
I'm glad I found this thread, as I am having a similiar problem that only occurs towing my camper. Keep blowing the PCM fuse (#24 under the hood) after a long towing session. Quits right before I get to my destination, or right before I get home. Only time it does it. Found a few other threads on the different sensors running from that fuse to run down this weekend, and will add the advice below to the list.
'01 -250, Crew Cab, Short Bed 7.3L, MBRP 4" Exhaust, AFE Stage II intake, Edge Evo Programmer, 4" Pro Comp lift, 35's, 20" Moto Metal Wheels.
You won't be able to pull up fuel pressure on your scanner, because the PCM doesn't monitor it. You could use a gauge connected at the fuel filter bowl to check it. You should see above 45 psi.
The ICP and IPR duty cycle that RT recommended you monitor can give you a good indication of the health of the injection system. Idling, you should see 450-500 psi on the ICP and 11-14 percent IPR. As you load the engine and increase rpms, both will increase, but IPR shouldn't go above 35-40 percent.
Now I have more problems. I have my scanner hooked to my truck and watching the data and it will not shut down. My luck !!! The icp idling is 475-500 & the duty cycle is 10.4. Hot at 2000 rpm the icp is 1170 & duty cycle is 20.6 Oil temp 217 deg. The only thing I did the last time it died was move the relays around in the fuse box to see if it would restart but it didn't until it cooled off. I will try it again tommorrow.
Well it shut down today. I started it and let idle for about 30 min and then I covered the grille at 2000 rpm Within 3 mins it quit. It was at 1170 psi & 20.4 duty cycle. After it died it has 170 psi & 65 duty cycle cranking and no start. Any suggestions on which sensor? Thanks
I bought a IPR solenoid from my dealer. I have run it thru 4 heat cycles and it has not shut down yet. I'm going to hook it to my trailer this friday and keep my finger crossed it don't shut down in traffic. Thanks RT & KLHansen for the help. I will get back with a update Sat. on how it did. Jeff
Everything is good !!!! I hooked to my 24Ft enclosed trailer and made a 400 mile trip in 110 degree weather with no problems. Now I need rear AC. At 110 degree the AC was struggling. Thanks for the help.
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