pcm compatibility
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pcm compatibility
whats up im new here this question problably has already been asked but im new to the site i have a 2003 f-250 with a 7.3 it has 138,000 miles i have a no start issue i had a diesel tech look at it and after 8 hours still no start he verifide oil pressure at icp 2000 psi still no start fuel pressure at pump 65psi and 65psi at left head removed valve cover to do compression test compression test was bad put all back together tried starting and suprise fired up stumbeld but eventually cleared up drove down the street returned to shop turn off and on fine let it sit overnight and next day same thing no start redid compression test now test was real good i dont know whats up diesel tech said i need to replace 6 injectors tested bad 2 good so he recomends replacing all 8 i dont think its the injectors because it started and cleared up any sugestions would be greatly apreciated by the way would a FHP3 pcm work if i plugg it into my 2003 7.3 my truck curently has a QLJ5 i want to rule out the pcm
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Joined: Jun 2006
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From: White Mnt's,New Hampshire
was there any smoke out the tail pipe when she did fire?? if yes what color?? if no...before you get into the truck and crank her over take a look into the HPOP
reservoir and make sure its full of oil.....
reservoir and make sure its full of oil.....
Post Fiend
Joined: Jun 2004
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From: Parker, CO
An FHP3 will not work correctly in your truck. Your's is a 2003, and the FHP3 is from a 2000. There's some wiring and PCM configuration changes that occurred in the 2002 model year that will cause odd things to happen if you were to switch to a PCM from a pre-2002 model.
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pcm
I did check the oil HPOP resv and it is 3/4 to 1 inch fron the top and as for the other question the diesel tech said when it finally started it smoked like crazy and then cleared up the smoke was BLACK thanks for getting back to me i hope i can figure this out with all your guys help oh yeah and the only reason i was asking if the FHP3 pcm would work was to see if the truck wasnt starting due to a bad pcm would it work to for that test?
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I opologize if i dont get reply right away im always in and out away from my computer but i really do apreciate the help and replies i dont get home till around 8pm pacific time ill try getting on then to see if anybody else is on thank you ill be checking in now and then till then
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He said he did a BUZZ test on all eight and six sounded bad the only two that he said were good #6 and #8
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Post Fiend
Joined: Jun 2004
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From: Parker, CO
A buzz test is nothing but an electrical check. It only tells you if you have a connection problem, not an injector problem. Either your tech doesn't know what he's doing, or he's trying to find a way to get you to spend a lot of money.
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hey whats up POCKET i trusted this guy he was recomended by a friend and he is a diesel tech at the local ford dealer you know whast funny i went to see another diesel tech and he had a ford f-250 that just came from the dealer to his shop the dealer told the owner that the motor was no goodand that he needs a new one, so they took it to this diesel tech and he figured out it was a bad pcm and 3 injectors after starting it he figured it had 3 bad injectors and this is on the same truck ford said it neede a new motor whats funny is that the diesel tech i had look at my truck works at that same dealership. my ford f250 is curently at another shop for a second apinion ill find out tomorrow what this other tech will come up with ill keep you posted and then im going to start working on it myself with the help of any info i can get. thanks
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Joined: Sep 2003
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From: Houston, Texas
If that doesn't resolve your issue, this is the box you can freely swap between trucks without compatibility issues. I.e. if your buddy has a 1999 truck, you can swap IDMs with him to rule out an IDM failure on yours.
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From: Garden City, KS
I HIGHLY doubt injectors... I have 305K on mine and they're better than most fresher injectors. Like pocket said, a buzz test just tests for connectivity. They will ALWAYS sound different. I suspect something electrical... Pocket is also right about the PCM types. The trucks had different clusters as well as a few other things and I think the change was in '02. If it was really injectors and such, it would be an EXTREMELY noticeable difference that you would notice all the time, not just intermittently.
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I agree with all of you i dont think its the injectors deu to the fact that when he removed the valve cover and put it back together it started and stumbled but it cleared up and ran fine, i too think its something electrical. i should find out something on it it later on today or tomorrow morning the diesel tech i took it to for a second opinion hasnt had a chance to dig into it its been there almost a week he promised me he would start on it t today if he hasnt touched it im just going to have it towed to my shop and start working on it my self with the help of any info i can get .
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hey as far as the pcm i figured if i can just plug it in and the truck started then i would be se if i had a bad pcm would it work for that ? if so then i would look for the right one to put in there . i am first going to swap out idm's and see if thats my issue then i would check pcm. i want to have my truck in front of me so i can just ask questions and try the suggestions out instead of waiting for some one to get the time and look at it and tell me they couldnt find nothing
Post Fiend
Joined: May 2009
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From: Pea Ridge, AR
What about the UVCH's?