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Old 10-18-2014, 03:37 PM   #1
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Extreme drop in horsepower

Greetings All,

Strange thing, can't figure it. Cummins Injected Turbo Diesel with Allison 4sp Auto/Tranny was running perfect, running like a bat out of hell, pulling hills and running 80mph without breathing hard. Today it can't pull a hill at 35mph, and takes a few minutes to get up to hiway speed. No odd sounds, no indication something is wrong other than...now umph, no pulling power.

All fluid levels are good, all gauges look good....I'm stumped.

Any ideas??

Thanks...Mark
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Old 10-18-2014, 03:54 PM   #2
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Re: Extreme drop in horsepower

Brakes on? Any smoke? Shifting correctly? Whats it do in neutral when you pin the throttle?
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Old 10-18-2014, 04:00 PM   #3
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Re: Extreme drop in horsepower

Start with cheap stuff first:

Air filter


Fuel filter
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Old 10-18-2014, 04:11 PM   #4
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Re: Extreme drop in horsepower

Quote:
Originally Posted by opus
Brakes on? Any smoke? Shifting correctly? Whats it do in neutral when you pin the throttle?
No....No smoke, brakes are fine. No strange smells, however yesterday I did notice a "slightly" stronger diesel smell from the exhaust than usual - but nothing drastic. As I mentioned - I do not perceive any "weirdness".
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Old 10-18-2014, 04:13 PM   #5
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Re: Extreme drop in horsepower

Quote:
Originally Posted by dond
Start with cheap stuff first:

Air filter


Fuel filter
I sort of wondered about "airflow"? Yeah, come to think of it it could be filters. How do you know if the turbo is engaging properly?
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Old 10-18-2014, 05:03 PM   #6
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Re: Extreme drop in horsepower

I'm thinking turbo but you'd hear a different noise and most the time see smoke. Will it run to full rpm? Is this a 5.9?
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Old 10-18-2014, 06:01 PM   #7
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Re: Extreme drop in horsepower

Quote:
Originally Posted by opus
I'm thinking turbo but you'd hear a different noise and most the time see smoke. Will it run to full rpm? Is this a 5.9?
Honestly...I am a newbie to the bus world, but have a decent amount of mechanical experience. I too wondered about the turbo, but I am not sure what I am listening for? As far as smoke is concerned, no - no radical increase in smoke, but there is an increase in diesel smell - not drastic though. I attributed this to the fact that the church I bought this bus from let it sit for a couple of years, and although I put fuel additive and filled with fresh diesel there may be some diesel algae, gelling, etc fouling the fuel filter.

I just topped everything off once again, and she broke loose and ran like a champ - then after a shut down and restart began to act like constipation again....LOL!
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Old 10-18-2014, 06:07 PM   #8
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Re: Extreme drop in horsepower

I'd go with a filter for now. Get some Power Service and prime the filter with it then put the as much a bunch in the tank. If you are really thinking algae, you can get Bio-Kleen from Power Service, as well.
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Old 10-18-2014, 07:26 PM   #9
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Re: Extreme drop in horsepower

Quote:
Originally Posted by opus
I'd go with a filter for now. Get some Power Service and prime the filter with it then put the as much a bunch in the tank. If you are really thinking algae, you can get Bio-Kleen from Power Service, as well.
Now I am stumped! Darned thing broke loose, and ran like a scalded dog, then while out test driving it i had trouble pulling a hill - darned near didn't get up it. When I got back to my neighborhood I couldn't even pull the hill. Just no power to the drive train. Does not shift hard or loose, revs fine when revving through throttle linkage - just no power to the wheels...
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Old 10-18-2014, 07:32 PM   #10
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Re: Extreme drop in horsepower

Does anyone know how to troubleshoot whether or not a turbo is working or not?

My lack of power may be related to the turbo, or possibly nasty algae packed fuel filter....have not checked the air filter yet - not even sure where this stuff is. Guess it's time to seek out a manual.
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