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Ok guys, I have a 1995 f-250, 7.3PSD with a 5 speed manual, 8" lift on 35's. Now I have a few issues that I can't figure out, first it has a stutter around 2k rpm (I say around because my tach. Doesn't work) I replaced the CPS and smoothened it out a little, but still stutters when you try to rev fast or slow. Second, the tach. Used to work, but now it doesn't, thought changing the cps would have fixed it but nope, still doesn't work. 3rd, I bought a suoerchips micro max 1700 for it (says 94-02 on the box), and it says communication error, tried to hook an OBD reader up, and it says the same thing, I have continuity through all the wires, and grounds are good, I have been told that 95 was not programmable, but have seen others using the same tuner on the same year truck! 4th when I start it up, it lopes pretty bad and shakes the whole truck, then stops shaking, and just lopes, then eventually will smoothen out, this is after cycling glow plugs 3 times as if I don't it won't start at all, thank you all for you time in reading this, and I hope you might have some tips or solutions for me. (Pic of truck)
Do you know the history of the truck? The romping sounds like what happens if you swap from an auto to a manual tranny, and use the auto PCM. Check the in cabin fuse panel for the fuse that powers the power point, as it also protects the data point.
Take a look at the connectors for the UVCH. Sounds like it may be melted some, not firing all the injectors or all of the glow plugs. You may find something like this.
Do you know the history of the truck? The romping sounds like what happens if you swap from an auto to a manual tranny, and use the auto PCM. Check the in cabin fuse panel for the fuse that powers the power point, as it also protects the data point.
I do know some history of it, I bought the truck with a blown tranny, and put a new zf5 in it, truck is factory 5 speed, and these issues did not exist when I bought it, I ran fine and tach worked, and did not rough idle on first start, I do have pcm code it is"sod4". The fuse is good, and I have power to the tuner, tuner and an OBD scanner turns on but says communication error
Take a look at the connectors for the UVCH. Sounds like it may be melted some, not firing all the injectors or all of the glow plugs. You may find something like this.
oh wow that looks terrible! When the truck is warm it runs fine, what is the UVCH? and where is it?
It can be intermittent until they get to the point mine was in the pic. Worth a look see. Start with the passenger side. For some reason that one seems to fail more often.
Also, the wire harness on the driver side can get chafed where it crosses the valve cover. A bare wire can cause all sorts of grief.
It can be intermittent until they get to the point mine was in the pic. Worth a look see. Start with the passenger side. For some reason that one seems to fail more often.
Also, the wire harness on the driver side can get chafed where it crosses the valve cover. A bare wire can cause all sorts of grief.
Ok will definitely look at those! What about the tuner and obd no communication? And the tach not working?
Studdering around 2000-2300 is often injector o-rings.
throw that tuner as far as you can. Get a hydra chip with proper tunes.
Ok, can I just replace the o-rings? And I would love to get a hyrdra chip, but don't have the funds to dump into a chip yet, got this tuners for pretty chip and would hope it would add just a touch of power, but again, it will not communicate with the pcm. Neither will an OBD2 Reader
Studdering around 2000-2300 is often injector o-rings.
throw that tuner as far as you can. Get a hydra chip with proper tunes.
And also the fact that I cant communicate with the pcm with the tuner or Reader, makes me question if the pcm is causing more problems such as not tach reading, now if I could communicate with it I could test to see if I have a tach reading through the obd port, but cannot.
Ok guys I checked the UVCH and they all look awesome! Did a cold start (7°c) and it ran horrible for the first 30 seconds (sounds to me like only one bank firing?) Now I have notice a stupid amount of white smoke (it was warm) when under throttle, and the stutter still remains! Would injectors O-rings cause white smoke too? The link is a link to the video of the smoke. https://drive.google.com/file/d/1AIo...rivesddrivesdk
Yes, those 2 look good, but the ones under the valve cover may be bad. How are the ones on the drivers side look? The IDM can shut one bank down to protect itself if it senses a short in one of the harnesses.
And also the fact that I cant communicate with the pcm with the tuner or Reader, makes me question if the pcm is causing more problems such as not tach reading, now if I could communicate with it I could test to see if I have a tach reading through the obd port, but cannot.
Except it's a 95'...since you know it all I'll just stop here
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