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HeyDriving today on highway - and around 60mph the truck starts to 'buck' gently like its missing fuel ?? Pressure gauge says 14 @ WOT and 16-17 regular.Me and ISX just put the old injectors out and put the oem ones back in (for the stall issue). It doesn't idle rough or appear to be missing (assumming missing in a diesel would sound like a rough idle/egnine etc).Not sure - Might stick some 2 stroke in it tomorrow - could one of the injectors be plugged/partial blocked ?? :shrug:

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hmm thought it had cleared out a code as I previously had a p04*** something related to fuel sensor wiring/poor signal and I never cleared it - yet when I cycle key since the battery disconnect I just get 'pdone'Will put my scanner on it later ........ let you know. MM - anyway you can thing of that the apps gets misaligned/miscalibrated and cause throttling issues - I guess this issue might come back - but so far 3 days of heavy towing and nothing. If it doesn;t come back - has to be either the APPS or some other reset - edge/ecm etc ???

  • 2 weeks later...
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-- just an updatethis issue has not yet returned, been around 10 days now. :hyper:

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MM - anyway you can thing of that the apps gets misaligned/miscalibrated and cause throttling issues - I guess this issue might come back - but so far 3 days of heavy towing and nothing. If it doesn;t come back - has to be either the APPS or some other reset - edge/ecm etc ???

Ummm... Disconnected battery, bad grounds, and a few other things can create this issue...

As for the APPS sensor the carbon track in it over time will wear out and the resistance value changes. So the calibration gets lost over time then eventually its so far off the APPS and the ECM battle for values and POP... P0121, P0122 or a P0123... :rolleyes:

I know the feeling, my truck has done it for the last year. Cruising down the road or just driving down the city streets it will just all of a sudden "buck" no change in RPM, fuel pressure or anything. Scares the heck out of ya. I have reset my APPS and it still does it. Only seems to happen every hundred miles.:banghead::banghead::banghead: I'm about done with this truck...

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I know the feeling, my truck has done it for the last year. Cruising down the road or just driving down the city streets it will just all of a sudden "buck" no change in RPM, fuel pressure or anything. Scares the heck out of ya. I have reset my APPS and it still does it. Only seems to happen every hundred miles.:banghead::banghead::banghead: I'm about done with this truck...

lmao - just suggested you do an apps reset in other thread. Did you wait at least 40 mins with both batteries disconeccted ? Can you speak with the guys from TIMBO apps and see what he thinks. ?? if it only happens at 45 --- are you in OD. As thats when the TC locks up. Could be a solenoid issue. I think its at 35 without OD - you could try driving for a while without OD and see what happens.

lmao - just suggested you do an apps reset in other thread. Did you wait at least 40 mins with both batteries disconeccted ? Can you speak with the guys from TIMBO apps and see what he thinks. ?? if it only happens at 45 --- are you in OD. As thats when the TC locks up. Could be a solenoid issue. I think its at 35 without OD - you could try driving for a while without OD and see what happens.

LOL I did wait at least 30 minutes before I connected the batteries. Not in OD. I'lll pay closer attention to the speed at when it happens. I wrapped the alternator wire in foil as well. Still no help. Have to look into the solenoid issue. Thanks!

I know this issue very well. and have been fighting it since getting the new tranny. It all has every thing to do with Bad Grounds. even though the battery treminals look clean doesn't mean they are. You notice that the symtoms stop once you pull the terminals off. It's a pain but sometimes it's the nature of the beast we run.

I know this issue very well. and have been fighting it since getting the new tranny. It all has every thing to do with Bad Grounds. even though the battery treminals look clean doesn't mean they are. You notice that the symtoms stop once you pull the terminals off. It's a pain but sometimes it's the nature of the beast we run.

Hmm, John to the right of the ECM behind the downpipe you have a loose ground. It was connected good enough at the time but I knew it was questionable. I don't think it will make a difference because it was on there pretty good but you might check and see if it loosened up or something, might help with the issue a little :shrug:
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Hmm, John to the right of the ECM behind the downpipe you have a loose ground. It was connected good enough at the time but I knew it was questionable. I don't think it will make a difference because it was on there pretty good but you might check and see if it loosened up or something, might help with the issue a little :shrug:

Dunno - not had the issue since the apps reset :) But I know the one you mean. ... will keep an eye on it.
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