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So I have a 02 f250 7.3 powerstroke with 206,000 miles. A few weeks ago it died while driving. On the side of the road I replace the CPS and the ICP sensor. Neither worked. I just recently replaced the valve cover gaskets and the wiring harnesses to see if that would fix it. Nope. Died on the way home.
Secondly. When I first got it, it rolled coal. Weird for a 7.3. Could t find a tune. I didn’t worry about it. Then the batteries died, so I changed those. After that, didnt roll coal, and has the classic low throttle response. After a few key cycles and driving it, then it went back to high throttle response and rolling coal. Just disconnected the batteries trying to get it to start on the side of the road, and low throttle response. I don’t see any tune, and there’s nothing in the OBDII port. I have a check engine light on after changing the gaskets, and it’s about my injectors.
HELP. I’m 17 and it’s my daily driver. I replace everything on my own, so I’m willing to do and test whatever you guys thing it could be
When you say you don't see a tune, you mean you pulled the pcm (always disconnect the batteries first) and found no tuner/chip? Obdii port isn't where most of our chips go.
How's your air filter? Fuel filter? Boost leak test? Up-pipes soot free?
What was your fuel level when it died? 1/4 tank? Has the Hutch and Harpoon been done?
When you say you don't see a tune, you mean you pulled the pcm (always disconnect the batteries first) and found no tuner/chip? Obdii port isn't where most of our chips go.
How's your air filter? Fuel filter? Boost leak test? Up-pipes soot free?
What was your fuel level when it died? 1/4 tank? Has the Hutch and Harpoon been done?
the air and fuel filter are fine. Up pipes are fine to my knowledge. The fuel is about 1/4 of a tank.
To answer your question in the tune, I can’t see a hydra tune or anything. I guess I can pull the compute and open it to see if there’s a chip.
how do I test the boost and the hutch and harpoon?
i replaced the CPS with a ford black one a while back and on occasion will get a "jump" slight hesitation etc. at speed under acceleration. the other day while just idling on a side road going slow just shut off.. kick to N turn off key and back on to restart no problem..
the other day i had an issue with idle.. we are in a campground with a couple of hill that are sorta steep.. so i am on the fuel coming up then have to sorta jump out of it to make the turn at top.. the engine drops to idle the surges back up and back down. sometime it sounds like a car with a real aggressive cam in it.. kinda looping at idle.. was wonder what could cause that.. fuel filter is like 15K miles new.. and on hard acceleration it runs smooth and clean.
i replaced the CPS with a ford black one a while back and on occasion will get a "jump" slight hesitation etc. at speed under acceleration. the other day while just idling on a side road going slow just shut off.. kick to N turn off key and back on to restart no problem..
the other day i had an issue with idle.. we are in a campground with a couple of hill that are sorta steep.. so i am on the fuel coming up then have to sorta jump out of it to make the turn at top.. the engine drops to idle the surges back up and back down. sometime it sounds like a car with a real aggressive cam in it.. kinda looping at idle.. was wonder what could cause that.. fuel filter is like 15K miles new.. and on hard acceleration it runs smooth and clean.
I replaced the fuel filter about 200 miles ago. Shouldn’t be it. The CPS is black. I’ve been trying to test it but can’t figure out how. I’m thinking the IPR needs replaced but I want to make sure first.
I don’t want to take it to someone to see what’s wrong with it because I’m trying to become a diesel tech, and that is currently my job. I also don’t have the money to start replacing stuff either. I have a good amount of tools, so whatever it is, I’d like to just do it and get it over with.
Check for boost leaks a couple of ways. On the exhaust side, carefully look for soot around both ends of the up pipes.
For the charge air side, you can build a boost leak checker like the one below, and slowly add at least 20psi of air pressure, soaping up CAC connections, plenums, and looking/listening for leaks. There will be some blowby from the CCV, but it will be a whisper.
I agree the IPR is suspect, if you have a good ICP sensor, and the sensor pigtail is good. You can unplug the ICP sensor and try to start to rule out bad sensor/wiring. The PCM will use default values for ICP and run just fine.
Is the ICP a motorcraft brand sensor? Is the IPR tin nut on tight?
I'd recommend logging a cranking session (and a driving session if you get it running), using FORScan or FORScan Lite and an OBDII dongle. A how-to thread below. Graph the results in the PID charting tool described there, or post the CSV file and we'll graph it for you.
Check your fuel pressure at key on, at idle, and under load. An easy method in the link below. I'd recommend installing a gauge in the cab at some point for this parameter, since it's not available via OBDII.
I agree the IPR is suspect, if you have a good ICP sensor, and the sensor pigtail is good. You can unplug the ICP sensor and try to start to rule out bad sensor/wiring. The PCM will use default values for ICP and run just fine.
Is the ICP a motorcraft brand sensor? Is the IPR tin nut on tight?
I'd recommend logging a cranking session (and a driving session if you get it running), using FORScan or FORScan Lite and an OBDII dongle. A how-to thread below. Graph the results in the PID charting tool described there, or post the CSV file and we'll graph it for you.
Check your fuel pressure at key on, at idle, and under load. An easy method in the link below. I'd recommend installing a gauge in the cab at some point for this parameter, since it's not available via OBDII.
there is some thick oil sludge around the exhaust side. I don’t know if that’s sout or not. Last time my truck died I unplugged the ICP and it still didn’t crank over. I can check the IPR nut
I'd recommend logging a cranking session (and a driving session if you get it running), using FORScan or FORScan Lite and an OBDII dongle. A how-to thread below. Graph the results in the PID charting tool described there, or post the CSV file and we'll graph it for you.
Agreed with guys above. Keep the fuel tank at 1/2 or above. A common problem with these trucks is the fuel pick up foot breaks off inside the fuel tank. Then it will suck air at about 1/4 tank. A fuel pressure reading would help decide if that is an issue. Long term I always recommend a fuel pressure gauge, but short term or if coin is short just test when needed.
Can you give us a part number for the new CPS? It's probably fine, but jic.
Definitely make sure the tin nut on the IPR is tight. Don't replace the IPR unless further diagnostics show it is a problem. It's $$.
Also get the Forscan and OBDII adapter going so you can scan sensors and get codes. Most common scanners cannot read these dinosaurs.
And to be sure the 7.3 is old, and nowadays a unique system. If you are learning diesel now you'll be taught all about common rail. So I'd recommend learning how your 7.3 works. It is no longer taught, but there are millions of them still on the road. You might be the only young guy in the shop who knows how to fix one.
You've got a lot of good work done so far! Keep at it! Keep us updated and we can help.
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