Do I need a new PCM?
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5th Wheeling
Joined: Oct 2024
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Likes: 2
If you're stuttering and stammering above 1500 rpm then you need to test the fuel pressure. There is a simple method in the tech section explaining what you need and how to do it. You'll want to check the fuel for aeration too. You can do that by catching a sample of fuel from your test rig before installing the gauge. If you get bubbles in your sample then you've got a leak somewhere letting the pump suck air. If you've checked all the fuses with a meter not just visual and they all are good you might try a hard reset on the PCM. It's kinda a long shot but I've gotten lucky and cured weird behavior with it before.
Also my friend has a Snap-on Solus Edge and while the truck was running it had trouble communicating with the pcm is that normal? Should I also try the ford scanner app?
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
With a compatible OBD2 dongle the Forscan app should work. No all scanners work on these trucks and not all dongles either. The Forscan site has some recommendations for compatible hardware if I recall.
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5th Wheeling
Joined: Oct 2024
Posts: 25
Likes: 2
I would probably be able to connect the scanner to the pcm
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5th Wheeling
Joined: Oct 2024
Posts: 25
Likes: 2
If you're stuttering and stammering above 1500 rpm then you need to test the fuel pressure. There is a simple method in the tech section explaining what you need and how to do it. You'll want to check the fuel for aeration too. You can do that by catching a sample of fuel from your test rig before installing the gauge. If you get bubbles in your sample then you've got a leak somewhere letting the pump suck air. If you've checked all the fuses with a meter not just visual and they all are good you might try a hard reset on the PCM. It's kinda a long shot but I've gotten lucky and cured weird behavior with it before.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
You can do it yourself. You disconnect both batteries, hot and ground, and cover them so no chance of making contact. Then jump the positive and negative cables together at the passenger battery and leave them hooked up for 5-10 minutes. That will completely discharge all the capacitors and drain all the residual electricity from the PCM. That will wipe the memory effectively be a factory reset. Be aware that it will likely act a little strange at first but usually only lasts a couple minutes. The PCM has to relearn fuel trim and injection timing, it will even shift weird through the first couple gears, but then it's fine.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Hang on, have you replaced the CPS yet? If it was deep enough to drown the IDM then the CPS was was in the drink too. Not to be the CPS guy but in this instance it would be cheap insurance. Remember Motorcraft only on all engine management sensors.
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5th Wheeling
Joined: Oct 2024
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Lead Driver
Joined: Oct 2005
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From: Ponca City, OK
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5th Wheeling
Joined: Oct 2024
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The truck never got flooded just the IDM from rain water
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5th Wheeling
Joined: Oct 2024
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Its cool
i was driving home from work and then it felt like it misfired then shut off, wouldn’t start back up. While waiting for a tow about half an hour later it started right up. Making me think it was the fuel pump. When that didn’t work our buddy came over with his scanner and got a code for no communication to the IDM. Removed the IDM and found out it had water inside.
i was driving home from work and then it felt like it misfired then shut off, wouldn’t start back up. While waiting for a tow about half an hour later it started right up. Making me think it was the fuel pump. When that didn’t work our buddy came over with his scanner and got a code for no communication to the IDM. Removed the IDM and found out it had water inside.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
But now you're scanner won't communicate with the PCM. Has he tried his again? If it was running fine then went down and the only difference now is the IDM then I'd be suspecting the IDM. If you replaced any other part you might swap them back if you can.
Banned
Joined: Dec 2018
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I'd find a way to warranty return that IDM and try another one. The reman Dieseltech chattanooga units have the vent hole sealed up so water cant get in. I had a parts store unit go bad on me after about 6 years. I assume it got moisture in it as well.