Engine or transmission problem or both?
Thread Starter
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5th Wheeling
Joined: Dec 2015
Posts: 46
Likes: 0
Engine or transmission problem or both?
Truck 2000 F 350 7.3 4r100 4x4
Rebuild transmission 20000 miles ago.
Truck runs ok little to no blow by never really had any big problems. Do have hydra chip set on fuel sip 65hp, I don't have a heavy foot.
Last week i noticed when stopped at red light for 10 seconds it crackling bad for a couple seconds, no drop in rpm to see on tac, don't see change in hpop pressure.
Then 4-5 days later when getting on the freeway like it lost power and shudder in 4th gear right before where it would go into overdrive and Trans temp was suddenly over 180, use to be in the 160.
I have had the lose of power and shudder 3-4 since, the crackling at stop is more a come and go.
Right now I have the hydra on stock and take it very easy till I have an idea what's going on.
Suggestions to look/check
I checked plugs connections under hood and transmission/ t case/ rear diff. Have not checked Harness under valve cover yet.
Do I have converter problem that try to lock up when stopped and get the crackling?
Or am I in need of a new transmission?
Rebuild transmission 20000 miles ago.
Truck runs ok little to no blow by never really had any big problems. Do have hydra chip set on fuel sip 65hp, I don't have a heavy foot.
Last week i noticed when stopped at red light for 10 seconds it crackling bad for a couple seconds, no drop in rpm to see on tac, don't see change in hpop pressure.
Then 4-5 days later when getting on the freeway like it lost power and shudder in 4th gear right before where it would go into overdrive and Trans temp was suddenly over 180, use to be in the 160.
I have had the lose of power and shudder 3-4 since, the crackling at stop is more a come and go.
Right now I have the hydra on stock and take it very easy till I have an idea what's going on.
Suggestions to look/check
I checked plugs connections under hood and transmission/ t case/ rear diff. Have not checked Harness under valve cover yet.
Do I have converter problem that try to lock up when stopped and get the crackling?
Or am I in need of a new transmission?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
First off, that's impossible. Fourth gear is overdrive so it can't go from fourth gear to overdrive. Most likely you are feeling the torque converter locking, not a shift.
Get Forscan at www.forscan.org. Their page shows how to select an adapter to plug into the OBDII port. With Forscan you can read the codes. You need to codes to diagnose this. You also can read live data so that you know what gear you're in and when the converter is locked up.
Get Forscan at www.forscan.org. Their page shows how to select an adapter to plug into the OBDII port. With Forscan you can read the codes. You need to codes to diagnose this. You also can read live data so that you know what gear you're in and when the converter is locked up.
Thread Starter
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5th Wheeling
Joined: Dec 2015
Posts: 46
Likes: 0
Downloaded the FORScan free to my laptop that will connect to the OBD2 Bluetooth adapter. Didn't get any codes besides exhaust control valve and intake heater as both was removed long time ago.
What do I need to look at of pid data?
What do I need to look at of pid data?
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,093
Likes: 4,703
From: Henderson, NV
This section from the Tech Folder at the top of the forum tells you all you need to know.
FORScan
Once you get done with that, read this to see how to log data and chart it.
https://www.ford-trucks.com/forums/1...d-version.html
FORScan
- FORScan Instructions - PC
- FORScan Lite Instructions - Android
- FORScan Lite Instructions - iOS
- FORScan Data Log Conversion
- PERDELs via Forscan
- Cruise Control/Speed Control Forscan function test
- Speedometer Calibration Using Forscan - Thread
- Speedometer Calibration Using Forscan - Video
- FORScan + FORScan Lite: Class Tutorial Q&A
Once you get done with that, read this to see how to log data and chart it.
https://www.ford-trucks.com/forums/1...d-version.html
It's a Van Gogh
Joined: Feb 2010
Posts: 7,802
Likes: 1,333
From: Elk Grove, CA
Everything above is recommended.
I'd also replace your fuel filter and post a pic of the old one.
Kinda sounds like fuel starvation to me. Hard to tell. No way to test fuel pressure without a dedicated aftermarket gauge, you can't see it on Forscan.
I'd also replace your fuel filter and post a pic of the old one.
Kinda sounds like fuel starvation to me. Hard to tell. No way to test fuel pressure without a dedicated aftermarket gauge, you can't see it on Forscan.
Thread Starter
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5th Wheeling
Joined: Dec 2015
Posts: 46
Likes: 0
Fuel filters under hood and under bed, fuel pump and fuel line from tank to pump replaced 3 weeks ago, filter under hood nice and clean, didn't cut open the filter under the bed. Fuel tank was dropped the same time to replace the foot, picked up old foot, no other debris or grid in fuel tank.
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Lead Driver
Joined: Jul 2017
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From: WV
Originally Posted by gdmafia
Fuel filters under hood and under bed, fuel pump and fuel line from tank to pump replaced 3 weeks ago, filter under hood nice and clean, didn't cut open the filter under the bed. Fuel tank was dropped the same time to replace the foot, picked up old foot, no other debris or grid in fuel tank.
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Fleet Mechanic
Joined: Nov 2005
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From: North Carolina, Raleigh
Was the torque convertor replaced with the trans?? I had a transmission replace and the cooler line was crimped at some point.. I would get a random shutter when pulling RV especially when pulling hills. it was not all the time just sometime.. when the trans was removed and the TQ looked at you could see heat on the area where the disk are located.. it was suspected the line was not allow fluid to flow freely and the TQ was slipping some what causing a shutter..
Truck 2000 F 350 7.3 4r100 4x4
Rebuild transmission 20000 miles ago.
Truck runs ok little to no blow by never really had any big problems. Do have hydra chip set on fuel sip 65hp, I don't have a heavy foot.
Last week i noticed when stopped at red light for 10 seconds it crackling bad for a couple seconds, no drop in rpm to see on tac, don't see change in hpop pressure.
Then 4-5 days later when getting on the freeway like it lost power and shudder in 4th gear right before where it would go into overdrive and Trans temp was suddenly over 180, use to be in the 160.
I have had the lose of power and shudder 3-4 since, the crackling at stop is more a come and go.
Right now I have the hydra on stock and take it very easy till I have an idea what's going on.
Suggestions to look/check
I checked plugs connections under hood and transmission/ t case/ rear diff. Have not checked Harness under valve cover yet.
Do I have converter problem that try to lock up when stopped and get the crackling?
Or am I in need of a new transmission?
Rebuild transmission 20000 miles ago.
Truck runs ok little to no blow by never really had any big problems. Do have hydra chip set on fuel sip 65hp, I don't have a heavy foot.
Last week i noticed when stopped at red light for 10 seconds it crackling bad for a couple seconds, no drop in rpm to see on tac, don't see change in hpop pressure.
Then 4-5 days later when getting on the freeway like it lost power and shudder in 4th gear right before where it would go into overdrive and Trans temp was suddenly over 180, use to be in the 160.
I have had the lose of power and shudder 3-4 since, the crackling at stop is more a come and go.
Right now I have the hydra on stock and take it very easy till I have an idea what's going on.
Suggestions to look/check
I checked plugs connections under hood and transmission/ t case/ rear diff. Have not checked Harness under valve cover yet.
Do I have converter problem that try to lock up when stopped and get the crackling?
Or am I in need of a new transmission?
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