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Is this normal??

Old Apr 17, 2013 | 06:46 PM
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Is this normal??

Truck around 55 mph feels like it is lunging or switching between OD & D. constantly. I can turn OD off and it feels good and quits. No transmission codes present.
 
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Old Apr 17, 2013 | 06:54 PM
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Not normal...
 
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Old Apr 17, 2013 | 07:05 PM
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This can be normal with some tuners who set a shift point right there.

When I had my DP Tuner I remember one of the tunes would do that which was obnoxious when towing because the speed limit is 55 when towing here. I would have to do 57 to get past that last shift.
 
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Old Apr 17, 2013 | 07:49 PM
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Originally Posted by A/Ox4
This can be normal with some tuners who set a shift point right there.

When I had my DP Tuner I remember one of the tunes would do that which was obnoxious when towing because the speed limit is 55 when towing here. I would have to do 57 to get past that last shift.
My tuner shifts into OD at 45 on normal throttle as I increase speed. (80E)
Any tuners or full stock? It's been awhile since I drove mine on OE mode. Can't remember when my switches to OD when not on a tune.
 
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Old Apr 17, 2013 | 08:13 PM
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Are you sure it is not the fan engaging?

You said seems like lunging or shifting no mention of RPM.
Sorry if I am off base but it seems like you would know if it was shifting.
 
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Old Apr 17, 2013 | 08:13 PM
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Originally Posted by BillyBob69
My tuner shifts into OD at 45 on normal throttle as I increase speed. (80E)
Any tuners or full stock? It's been awhile since I drove mine on OE mode. Can't remember when my switches to OD when not on a tune.
I have the edge evolution... I have been running it on level 2. I just switched to level 1 I'll see if it makes a difference. Does anyone know if you can change the shift point for OD with this tuner
 
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Old Apr 17, 2013 | 08:14 PM
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Originally Posted by TXdoug
Are you sure it is not the fan engaging?

You said seems like surging or shifting no mention of RPM.
Sorry if I am off base but it seems like you would know if it was shifting.
Never paid attention to RPMs if it was the fan why would it quit when I turn OD off??
 
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Old Apr 17, 2013 | 08:23 PM
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When you hit the odo you increase the rpm and water flow. Then the fan clutch sees no need to engage.

How hot is it where you are? Does it sound like a jet engine landing under the hood? or Do the rpms go up?
 
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Old Apr 17, 2013 | 08:31 PM
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Originally Posted by TXdoug
When you hit the odo you increase the rpm and water flow. Then the fan clutch sees no need to engage.

How hot is it where you are? Does it sound like a jet engine landing under the hood? or Do the rpms go up?
Doesn't matter time of year or temperature...I have always associated the increased motor noise with increased RPMs I'll pay attention and see
 
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Old Apr 17, 2013 | 08:50 PM
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Check it out, you should know what the fan sounds like if you are haulin' that 5er around.

If I am towing at just 55 I use odo.
 
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Old Apr 17, 2013 | 09:21 PM
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Originally Posted by TXdoug
Check it out, you should know what the fan sounds like if you are haulin' that 5er around.

If I am towing at just 55 I use odo.
odo?? (Over driver off??) If so what is the max you can run with it off?
 
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Old Apr 18, 2013 | 01:47 AM
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EBP - clean sensor and tube. The Exhaust Back Pressure sensor is the feedback to the PCM as to how hard the engine is loaded. If the EBP is plugged up or reading high, the PCM always thinks the truck is under heavy load and will shift accordingly. It also messes with your MPG. It would be best to get a scan tool on it and check the reading against the MAP (they should match +/- 0.2) with KOEO. The sensor is 100 bucks at the dealership, and cheaper from Clay.
 
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Old Apr 18, 2013 | 06:53 AM
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Originally Posted by awillo0406
Truck around 55 mph feels like it is lunging or switching between OD & D. constantly. I can turn OD off and it feels good and quits. No transmission codes present.
What if you go above 55? Does it quit at 65-70?
 
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Old Apr 18, 2013 | 06:58 AM
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Originally Posted by awillo0406
odo?? (Over driver off??) If so what is the max you can run with it off?
Depends on how big your tank is and how far the next station is. These engines will run all day long at high RPMs with no issues. They love it infact. As long as EGTs are manageable anyway. Just make sure you don't pass any fuel stations up.

When's the last time you flushed trans fluid?
 
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Old Apr 18, 2013 | 10:03 AM
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Stop playing with the OD....Leave it on.
 
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