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The truck has a 4 speed trans, 3rd is drive, 4th is OD. I assume you're confusing the TC lockup with gear changes, you need to figure out if the hard shifts are actually gear shifts or TC clutch engagements.
And you thought it was only shifting down to 2nd at stops, but TP shows it going to 1st. I don't know if the computer can know that it has actually shifted to 1st, I think all it can tell you is that 1st was commanded. You can verify by shifting it to 1st and compare to when you don't and see if it's actually shifting to 1st or just being commanded to.
It's possible the truck has been tuned and that could be making it shift funny. Any way to get info & vehicle history from the previous owner?
You are correct, I am confusing TC lock up with shifts. If I shift it with gear selector it does the same thing. If I'm running down highway at 60 mph in OD and punch it. It will down shift. It will seem to up shift twice. The first time it up shifts is slightly hard the second time is really hard. If I start from a stop an manually shift it up through gears, into second is smooth, into D is smooth. Then it seems to shift twice more. Both times hard. That's why I was assuming it was going to 4th then into OD. Is it at all possible the truck could have a different trans from the factory? Not a 4R100? It is an F-350 with a big utility bed on it. I'm sure it's never been chipped or tuned. I think it was a utilities truck the first part of it's life. The second owner had it for 10 yes and he owned a roofing company. He was Hispanic and hard for me to understand.
Also, my original description isn't 💯 accurate. The truck is shifting down to 1 St gear when I stop according to torque pro.
Torque Pro doesn't know what gear the transmission has shifted into. It only knows what gear the PCM told the transmission to shift to.
Originally Posted by Jlwhitt77
I'm not sure how to check fuel pressure with the app.
That's because it can't be done.
Originally Posted by Jlwhitt77
Mainly shifts good 1st through 3rd but ALWAYS shifts a little hard into 4th and even harder into OD. If I have the pedal to the floor going into 4th and OD she shifts pretty smooth. I'm now thinking I have more than one problem. Something going on with PCM and a problem with TC lock up. No flashing OD light.
The transmission shifts 1-2-3-torque converter lock-4. Fourth gear is overdrive.
Originally Posted by Jlwhitt77
My neighbor has a 7.3 but I think it's a 93 and probably will not work.
The '93 does not have an engine computer, so there isn't one for you to try.
Originally Posted by Jlwhitt77
If I buy one from a salvage yard will it need flashed before I can try it out?
If you get one from the same year, engine, and transmission it will not need to be flashed.
Torque Pro doesn't know what gear the transmission has shifted into. It only knows what gear the PCM told the transmission to shift to.
That's because it can't be done.
The transmission shifts 1-2-3-torque converter lock-4. Fourth gear is overdrive.
The '93 does not have an engine computer, so there isn't one for you to try.
If you get one from the same year, engine, and transmission it will not need to be flashed.
Originally Posted by JOHN2001
I don't remember how many psi I used but I'd say 30 ish should be plenty, I know I used more then that but don't remember to be honest.
By your description, trans shifts 1, 2, 3, TC lock up, 4th. That would explain why I'm thinking there are 5 gears. What would cause the lock up to be so hard? I believe I have a fuel starvation problem as well. Could that be a possible cause?
By your description, trans shifts 1, 2, 3, TC lock up, 4th. That would explain why I'm thinking there are 5 gears. What would cause the lock up to be so hard? I believe I have a fuel starvation problem as well. Could that be a possible cause?
Yes, it could. If the engine isn't making the torque the PCM expects it to make the pressures it uses to make the shifts and lockups will be too high. That will cause rough shifts.
Yes, it could. If the engine isn't making the torque the PCM expects it to make the pressures it uses to make the shifts and lockups will be too high. That will cause rough shifts.
Ok. Thank you! It's all starting to make sense now. I'm pretty sure I need to do the hutch / harpoon mod. I thought I was having a problem with the PCM or TPS. I've ran some seafoam through it and it's getting better. Just trying to buy some time until I have time to drop the tank. I've noticed if I've got the pedal to the metal, the TC lockup and into 4th shift is allot smoother.
Why not just check your fuel pressure? Just because it doesn't have a way to push a button doesn't mean that it can't be checked, it means it can't be checked electronically. There's a port on the fuel bowl you can take the plug out of and tie into with a gauge. Do a search and you'll find tons of info on it.
As JOHN2001 mentioned, there are two ports on the backside (toward the cab) of the fuel bowl you could tap into in order to read fuel pressure. It should read ~60 PSI at idle from either port. The one on the lower right (looking at the picture below) is post filter and the one on the upper left is pre-filter. The fittings/plugs should be 1/8 FNPT.
No first gear except when I put it in first on the column only in drive it will start out in 2nd. Kinda like taking off in a manual. 1st is there very rarely I replaced the solenoid filter and fluid and still no luck any suggestions btw I have all my other gears
Why not just check your fuel pressure? Just because it doesn't have a way to push a button doesn't mean that it can't be checked, it means it can't be checked electronically. There's a port on the fuel bowl you can take the plug out of and tie into with a gauge. Do a search and you'll find tons of info on it.
I do not have a fuel pressure gauge. I will be picking one up today.
No first gear except when I put it in first on the column only in drive it will start out in 2nd. Kinda like taking off in a manual. 1st is there very rarely I replaced the solenoid filter and fluid and still no luck any suggestions btw I have all my other gears
Do you have a scan tool to see if the PCM is commanding 1st dear?
Yes, it could. If the engine isn't making the torque the PCM expects it to make the pressures it uses to make the shifts and lockups will be too high. That will cause rough shifts.
I believe I have an electrical problem robbing power. Yesterday morning when leaving for work, I was idling in the driveway. When I plugged my phone into the charger, Mr RPMs dropped by about 150. Unplugged the phone and RPMs came back up. For ****s and grins I tested out throttle response both with phone plugged in and unplugged. There is a noticable difference with the phone plugged in. I had the batteries tested and both failed. I replaced both batteries yet still have the same problem. Any ideas? The alternator is putting out 14.6V.
I believe I have an electrical problem robbing power. Yesterday morning when leaving for work, I was idling in the driveway. When I plugged my phone into the charger, Mr RPMs dropped by about 150. Unplugged the phone and RPMs came back up. For ****s and grins I tested out throttle response both with phone plugged in and unplugged. There is a noticable difference with the phone plugged in. I had the batteries tested and both failed. I replaced both batteries yet still have the same problem. Any ideas? The alternator is putting out 14.6V.
Check for corroded grounds. In this case, pay particular attention to the one going from the frame to the cab. Use 4ga or better battery cable to replace the ****ty factory braided stuff. Add a ground cable from the alternator case directly to negative terminal of the battery. Sorry I haven't been checking in more. Work has been whipping my ***.
