Rapid OD hunting
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Elder User
Joined: Feb 2006
Posts: 765
Likes: 1
From: Eastern Ohio
Rapid OD hunting
I got a new issue, the truck will shift from od-3-od all in about a second. The higher the tune, the more likely it is to do it. It only happens at light throttle, 40-50 mph and under load such as up hill or towing. I believe it's down shifting, not unlocking the converter, the rpm jump is the same as canceling OD. No changes made before this started.
Short, bad quality vid of the issue.
ODHUNT - YouTube
That is 42-ish mph, up hill, steady throttle and unloaded.
Trans temps are normal and no signs of slipping. I'm thinking this is not really a transmission issue, but a symptom of some other issue. That may be wishful thinking.
Any ideas?
Short, bad quality vid of the issue.
ODHUNT - YouTube
That is 42-ish mph, up hill, steady throttle and unloaded.
Trans temps are normal and no signs of slipping. I'm thinking this is not really a transmission issue, but a symptom of some other issue. That may be wishful thinking.
Any ideas?
Thread Starter
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Elder User
Joined: Feb 2006
Posts: 765
Likes: 1
From: Eastern Ohio
This does not look to be related to the tuner. Shift parameters are different in all my tunes and it happens at same point, just above lock-up at light throttle. Shift points are controlled by many sensors using parameters set by the tunes. I believe it is seeing something thing telling it to downshift that only last second under certain conditions. The "stock" I'm referring to is still a tune on my chip and it may happen on this tune, I'm just not in this tune often and the loads are much less in the stock tune.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
Do you have AE or some other useful scan tool? If so, it would be interesting to monitor Shift Solenoid 1 and Shift Solenoid 2 to see what is happening. From memory...
SS1=1 with SS2=0 is first gear
SS1=1 with SS2=1 is second gear
SS1=0 with SS2=1 is third gear
SS1=0 with SS2=0 is OD (fourth gear)
Might as well look at Torque Converter Clutch Modulated as well as Exhaust Back Pressure. If possible, record the data while you are duplicating the symptoms and post back the results.
SS1=1 with SS2=0 is first gear
SS1=1 with SS2=1 is second gear
SS1=0 with SS2=1 is third gear
SS1=0 with SS2=0 is OD (fourth gear)
Might as well look at Torque Converter Clutch Modulated as well as Exhaust Back Pressure. If possible, record the data while you are duplicating the symptoms and post back the results.
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Elder User
Joined: Feb 2006
Posts: 765
Likes: 1
From: Eastern Ohio
No AE. But this has got me thinking about getting it. All I have is a scan gauge and superchips tuner to read codes and watch things.
No, I can't get into the right speed/rpm/torque range with out tunes. My 25hp heavy tow tune is still in third at this speed and stock hasn't done it empty. Not sure if the stock tune stopped it when loaded with around 17k gross. These tunes have been fine for over 10k, I've only had the problem for the last 4-5 hundred miles.
No, I can't get into the right speed/rpm/torque range with out tunes. My 25hp heavy tow tune is still in third at this speed and stock hasn't done it empty. Not sure if the stock tune stopped it when loaded with around 17k gross. These tunes have been fine for over 10k, I've only had the problem for the last 4-5 hundred miles.
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Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
Ah... we might be on to something here. Shake-N-Bake posted a topic [LINK] where he cleaned the EBP sensor. The EBP sensor sends a signal that tells the PCM what the engine load is - which has an impact on the shifts. Conducting this maintenance procedure would not be a waste of time, and it might even resolve your problem.
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Thread Starter
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Elder User
Joined: Feb 2006
Posts: 765
Likes: 1
From: Eastern Ohio
The tube was put on last spring,so it should be good. The sensor was just cleaned at that time so it is suspect. I can watch EBP and MAP to see they are line with each other. And watch the EBP numbers for any changes that don't make sense.
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