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Old 09-15-2019, 04:42 PM   #1
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Join Date: Aug 2019
Location: Baton Rouge, LA
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Canít get above 65

Still getting used to our recently acquired 99í Ultimate Advantage - Freightliner with a CAT 335. Allison transmission.

On the way home from a trip today, I couldnít get the coach over 65mph.

Accelerates fine. A lot of power below 1500rpm.

Around 60mph in 6th gear I can feel a shake. If it downshifts into 5th and goes to 2000rpm, itíll lose speed.

Stopped at a gas station for about 10 minutes, and it seemed to gain some more power for a while but lost it again after a while.

Thoughts? Could exhaust brake be restricting flow? Exhaust brake works when I have it on.

No warning lights on the dash.
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Old 09-15-2019, 04:53 PM   #2
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Quote:
Originally Posted by MelLandry View Post
Still getting used to our recently acquired 99í Ultimate Advantage - Freightliner with a CAT 335. Allison transmission.

On the way home from a trip today, I couldnít get the coach over 65mph.

Accelerates fine. A lot of power below 1500rpm.

Around 60mph in 6th gear I can feel a shake. If it downshifts into 5th and goes to 2000rpm, itíll lose speed.

Stopped at a gas station for about 10 minutes, and it seemed to gain some more power for a while but lost it again after a while.

Thoughts? Could exhaust brake be restricting flow? Exhaust brake works when I have it on.

No warning lights on the dash.
Check Fuel Pressure.
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Old 09-15-2019, 05:31 PM   #3
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Check Fuel Pressure.
Thanks JR. Any tips on the best approach? Do I need to install an in-line analog gauge?
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Old 09-23-2019, 05:44 AM   #4
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Just finished fixing my 2004 cat 330 in a Journey, Had a vibration at 15-1700 rpm. Down on power, Had algae in the fuel, Replaced injectors after Killem fuel treatment and several fuel filter changes. Running Great Now.
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Old 09-27-2019, 12:56 PM   #5
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Replacing the fuel filters might do the trick. Lower fuel pressure might be caused by plugged filters.
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Old 10-06-2019, 08:08 PM   #6
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I also thinking filters....And maybe Algae, seem you live in a humid climate.
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Old 10-07-2019, 04:55 AM   #7
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If you change filters and Still have shake or vibration along with low power check injectors, I had 2 bad injectors, but decided to change all since I had algae issues as well from coach sitting a long time before I got it. Yes sunny south humid FL.
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