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Old 05-15-2013, 11:28 AM   #1
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No horsepower

1998 Country Coach / Cummins 325 8.3L - seems to have lost horsepower, engine runs fine, is not smoking - max speed between 50 - 60 mph. When in neutral accelerator will run up to 2500 rpm. We have changed fuel filters several times as we first thought we had gotten a bad load of diesel and have used Lucas fuel additive a well.... No improvement. Currently on the road (600 miles from home).... Any suggestions would be greatly appreciated.
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Old 05-15-2013, 11:38 AM   #2
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ji would check all the turbo hoses for leaks ..and tighten as you go..jeff
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Old 05-15-2013, 12:03 PM   #3
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You mentioned , fuel filters, have you checked the air filter, visual check ! , the air filter condition indicators can be wrong. Then as , beenthere, says you need to check all componants between the turbo and intake for leaks.
Do you have a 12 valve or 24 valve engine,98 was a change over year, on the 24 valve a failing lift pump can cause power loss.
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Old 05-15-2013, 12:23 PM   #4
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Loss of power, if fuel supply is OK, mostly caused by a loss of boost. As suggested, make sure all hoses between air cleaner and turbo, turbo and inner-cooler, and inner-cooler and intake manifold are tight and not leaking air.
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Old 05-15-2013, 03:07 PM   #5
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I once had a 18 wheeler that suddenly lost power. Would still make it up the hills, but at a crawl. The shop found a blown turbo hose. Replaced the hose, back to normal.
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Old 05-15-2013, 03:45 PM   #6
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I agree with the others sounds like a loss of boost pressure.
Air intake to intake manifold something is wrong.
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Old 05-15-2013, 04:41 PM   #7
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I would agree with a boost leak, but in some cases they can be pretty loud, and should be audible.

Other than that I have herd drivers say low oil can cause it by somehow loss of compression, I have never had this happen to me in a diesel so cant say much about it

Make sure air filter is clean and there in nothing clogged in the air inlet.

Are you getting any or a lot of black smoke when its under a load
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Old 05-18-2013, 06:37 PM   #8
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Quote:
Originally Posted by CC98 View Post
1998 Country Coach / Cummins 325 8.3L - seems to have lost horsepower, engine runs fine, is not smoking - max speed between 50 - 60 mph. When in neutral accelerator will run up to 2500 rpm. We have changed fuel filters several times as we first thought we had gotten a bad load of diesel and have used Lucas fuel additive a well.... No improvement. Currently on the road (600 miles from home).... Any suggestions would be greatly appreciated.
Most likely you have a turbo or after cooler hose that has failed or slipped off it's connection. Same this happen to me with our old Beaver and it was a clamp on an after cooler hose that failed.
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Old 05-21-2013, 09:58 AM   #9
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I just went through the same thing with my '98 Allure. There is tee a fitting on the front of the injector pump that supplies vacuum to the turbo. Mine broke from vibration and the turbo wouldn't spin up. Link Automotive in Nashville found the problem and fixed it in about an hour. Taking off everything seemed normal but the boost never came in. We drove home from Birmingham going as fast as I could downhill and about 40 uphill. Lift the engine cover under the bed and you'll see the fitting on the curb side of the engine. On the front end of the injector pump is a device that appears to be a vacuum pump with a diaphragm. There will be a tee fitting on the outlet of the diaphragm that will probably be cracked or broken. You can follow one of the lines from the tee across the top of the engine to the turbo. I hope this is what your problem is as its a $3 fix.
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