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Old 01-12-2015, 11:18 AM   #1
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390BH-60 Fifth gear issue

When I am taking off from a stop or accelerating from 30mph, I have an issue when the coach shifts from 4th to 5th. Once it shifts to fifth, the turbo boost drops to 5-8lbs and the Berk stops accelerating. No matter how much as I press the pedal, it barely maintains speed in the 55mph range on flat ground. Once I go downhill and get to 60mph it shifts to 6th gear and the boost kicks back in. I can manually put it in 4th and get to 60 and then put it back in auto and it does better.

Does anyone have this issue? Have you noticed anything similar?
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Old 01-12-2015, 11:39 AM   #2
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I personally have not had that issue ever with my 2014 390BH (340).

Jason
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Old 01-12-2015, 11:44 AM   #3
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Quote:
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I personally have not had that issue ever with my 2014 390BH (340).

Jason
Ok.

I am just checking before I take it to Freightliner.

Thanks!
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Old 01-12-2015, 11:45 AM   #4
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Fault codes?

Fuel filter/s replaced?
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Old 01-12-2015, 11:50 AM   #5
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Fault codes?

Fuel filter/s replaced?
No Fault codes and I replaced the fuel filters 2k miles ago. It has been doing this since I bought it. It pulls like a freight train until it hits 5th and then you almost experience weightlessness as the acceleration stops.

I have been telling myself it is some kind of transmission program to protect 5th gear, but we went to the Orange Bowl in Miami and it was very annoying.
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Old 01-12-2015, 11:50 AM   #6
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It almost sounds like your computer needs to be re-flashed or programmed. If it's working fine in all the gears except 5, then I would think the computer is cutting your turbo back in 5th gear for some
Reason.

Jason
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Old 01-12-2015, 11:52 AM   #7
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I tend to agree with you.

I just wanted to see if anyone else had this issue before I take it to Freightliner. It's only 30-45 minutes from me, but it is a hassle to take it in.
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Old 01-12-2015, 11:58 AM   #8
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No Fault codes and I replaced the fuel filters 2k miles ago. It has been doing this since I bought it. It pulls like a freight train until it hits 5th and then you almost experience weightlessness as the acceleration stops.

I have been telling myself it is some kind of transmission program to protect 5th gear, but we went to the Orange Bowl in Miami and it was very annoying.
If you pull the dipstick for the transmission and sniff the oil does it smell like it is burnt?
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Old 01-12-2015, 12:58 PM   #9
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No Fault codes and I replaced the fuel filters 2k miles ago. It has been doing this since I bought it. It pulls like a freight train until it hits 5th and then you almost experience weightlessness as the acceleration stops.

I have been telling myself it is some kind of transmission program to protect 5th gear, but we went to the Orange Bowl in Miami and it was very annoying.


It sounds to me like turbo-under boost sensor is faulty
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Old 01-12-2015, 01:00 PM   #10
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I have not smelled the fluid. I'll go the storage and check it.

Looks like I need to take it to Freightliner.

Thanks for the replies.
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