7.3L Powerstroke: Crank and no start. Mechanical Guage testing. You'll never guess the cause!
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- Опубліковано 12 вер 2024
- So here I try my best to show how to test a HPOP with a gauge and we also air leak test the injector seals. This was a 7.3L Powerstroke crank and no start. You'll have to watch the vidya to find out the cause.
Disclaimer: This video is intended for educational purposes only. Always follow proper manufacturer instructions and safety procedures.
i was having the same isdues, fell in a black hole on u-tube. Mechanic that was too busy to look at it said starter. Guys ( former mechanics ) at auto parts store said fuel. U- tuber said replaced all this stuff and it was the "box" in the wheel well.( forget the name right now) $500.00 later it wasn't the problem. It was the starter. Where i live we have very few good mechanics, good diesel mechanics are far and few between and even ones you have been a customer with for years are too busy. Most change parts but aren't diagnosing anything. I really do appreciate your and others videos! Sorry to say a lot of it is over my head.
Thanks for the video! I'm dealing with the same issue on my 1997 with 137k miles. First new CPS, then oil and filters changes since old oil was 2 years old, and still had really long starts and the truck would die after warming up, so I replaced the IPR with an OEM one. Reservoir stayed full so LPOP is good. I couldn't use a scan tool until I had my PCM rebuilt (had a bad communications circuit), but now watching ICP pressure shows 0 psi (it used to climb to 300 or so). I am waiting on some fittings to dead head the pump, but now I'm thinking the HPOP is fine after watching your video. I can't imagine my new IPR is the problem, so I'm starting to think I have a bad leak in the injectors. Also, after so many cranks my starter is dying (can't get it above 110 RPM with fresh batteries), so I ordered a new Denso. Could a dying starter prevent the HPOP from building pressure possibly? Could the old oil or air after the IPR replacement still be circulating through the system and causing some issues? I'd love to hear what else you think it could be. Thanks!
I think this may be our problem. IPR or High pressure pump. We have a 96 350 camper van with a 7.3. Cranks endlessly with ZERO smoke, like, at all. New ICP. New electric fuel pump with good pressure. New injector harness. HPOP full.
Had been having intermittent loss of power on the interstate....then it would only fire on ether. Swapped the harness, now we are here. Still nothing. Working on checking the continuity of the harness.
I would like to burn it to the ground at this point. 😆
The only difference in the ipr’s is the edge filter at the end.About 2 years ago I had the same problem with my 94,after I replaced the ipr 3 times the icp 5 times and the cps many times it wound up being the pig tail going to the ipr.the 2 wires were both cracked in about the same spot and would arc across and ground out and would either cause a no start or the truck would die going down the road.I got the pigtail from Riffraff and that fixed my problem maybe that might be something to look at.
many thanks--best info on the web--describing my trucks behavior precisely
Great vid for those who want to be thorough and learn nuances.
Video is not for the "high speed low drag" folks lol
I went round and round with hpop. '97. Did an expensive upgrade replacement, only to find that I made a measurement error early on. I hooked up a button to the starter solenoid so I could crank from the engine front. But this didn't energise the hp regulator, which just let oil bypass with zero pressure built. Fine. Nice new hpop building 3000psi. Next thing reveals no enable signal to the IDM, hence zero injectors firing. I checked many basic things in the wiring, but have now ordered a new PCM. Does anyone know anything that would keep a good PCM from enabling the IDM?
The only one thing i do is put 12v to the ipr when dead heading the hp pump,two things you rule out control and you can listen to the ipr i changed a lot more iprs than pumps.
are you scanning the obd1 port or the obd2 port. just bought an auction 1995 7.3 truck unseen and it is crank no start. have you ever flashed the computer to update to obd2? what scanner are you using? thanks for the video!
Launch brand scanner. Use the OBll plug. It's under the passenger side of the dash. I've never had to flash anything. All 7.3l engines use OBD 2
@@prodieselrepair3218 cool. I will look there. I only saw the EEC IV plug on the firewall. thanks.
Hey i have a 7.3L on a F350 im having hell getting it started. it will crank wont start. i replaced the IPR and the Cam Sensor. i unplugged the ICP to bypass that still didnt start. yesterday i drained the fuel bowl using the valve on the side. drained it went back to the ignite turned the key fired up INSTANTLY and died after 5 seconds. i went and got some diesel becuase i was at 1/4th a tank went to start it again FIRED right up. IDLED terrible! for like 5 minutes then the idle was fine i turned it off and started it again firing right up again running smooth. took it for a drive was perfect. came back the next day and the same thing as before cranks but wont start. ANY ideas? only has 131k miles on it
Did you get actual Ford parts for the IPR and Cam Sensor? There's lots of aftermarket parts that can be used on the 7.3L but not those two parts. Troubleshooting is not as hard as one thinks. Engines need four things to run: Air, Fuel, Compression, and Cumbustion. When your engine only cranks and doesn't start you need to find out whats missing. Hook a fuel gauge up and a scanner so you can find out what you need to fix to get it going.
Your float in the tank could be off.....when mine reads a 1/4 it's really on empty. Just food for thought
Are you by Hhi?
What brand of scanner do you have?
Launch
Exactly what my truck is doing loping after i hit the throttle and let off
Usually the ICP causes that.
@prodieselrepair3218 thank you
So, my 7.3 NS after oil change. Solutions?
Hook up a scanner and figure out what's missing. You either don't have enough high pressure oil, not enough fuel, or you could be missing the cam sensor or icp input.
So what’s was the Problem you never gave an answer?
I tell what the problem was in the last part of the video.