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12-13-2015, 11:30 AM
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#1
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Junior Member
Join Date: Nov 2009
Posts: 3
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Reduced engine power
2003 National SeaBreeze LX
50,000 miles 8.1 ltr Chevrolet vortex
While on trip to from Florida to Grand Canyon then to Maine then return to Fl. the engine lost power four times during the trip and coasted to a stop. Luckily we were always in a location where we could pull off, turn off engine, which would be idling then I would restart it like nothing happened.
Message on instrument panel stated; DIMINISHED ENGINE POWER OR REDUCED ENGINE POWER.
Has anyone else had this problem and if so what was the fix?
Any help appreciated
DAVE
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12-13-2015, 08:17 PM
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#2
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: Dec 2008
Posts: 301
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It sounds like your engine is going into "limp mode". This can be caused by any number of things. You will need to go someplace where they have a diagnostic computer that can bring out any "trouble codes" that are stored in one of the engine computers. Don't just start replacing things until you do this.
Bill
__________________
BILL & CINDA SCHWARTZ
2005 SEABREEZE LX 8360
W-22 WORKHORSE 8.1 LTR.
BEAUTIFUL PHOENIX, AZ
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12-14-2015, 05:42 AM
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#3
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: Apr 2013
Location: Jackson,Ohio
Posts: 398
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You are lucky that you made it home. Get to a reputable repair shop that has a good computer and someone that knows what he is doing. ASAP.
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12-14-2015, 06:02 AM
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#4
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Senior Member
Tiffin Owners Club
Join Date: Feb 2015
Location: North Florida
Posts: 371
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This being a chevy I had the same issue with my Chevy 1 ton truck . Computer had no codes and ended up to being low voltage to the computer. There is a fusable link mounted on firewall. This was available from dealer only. We also replaced throttle sensor on foot pedal as this was a common problem item with Chevy.
__________________
Mark Miller
2016 tiffin Pheaton
Go Gators
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12-14-2015, 06:12 AM
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#5
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Senior Member
Country Coach Owners Club
Join Date: Jun 2013
Posts: 608
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Quote:
Originally Posted by markmiiler
This being a chevy I had the same issue with my Chevy 1 ton truck . Computer had no codes and ended up to being low voltage to the computer. There is a fusable link mounted on firewall. This was available from dealer only. We also replaced throttle sensor on foot pedal as this was a common problem item with Chevy.
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There is also a ground strap from the frame to the engine on the right side that would rot out and cause all kinds of electrical issues.
__________________
1997 Country Coach Intrigue Horizon 36' (The Dinosaur Burner)
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12-14-2015, 09:41 AM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Apr 2010
Location: Casa Grande AZ
Posts: 246
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Had a similar problem with power loss, and code fr Oxy sensor. After clearing code, restart and all fine. Finally a knowledgeable tech told me he was 98% sure the Mass air flow sensor was dirty, triggering error codes. I had it cleaned using special MAF spray and problem gone. Driven over 1500 miles without a hitch. If you have an aftermarket filter like K&N or Banks, be sure the spray is completely dry before reinstalling after service. residue collects on the "hairlike" wires in the sensor, causing loss of power. Worth a try. good luck.
__________________
 Alleyman; 2004 Dolphin 5355; Banks Power Pack, Ottominder; 405 Watts Solar, 2010 Explorer XLT Toad. four month boondockers!
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12-15-2015, 05:16 PM
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#7
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Member
National RV Owners Club
Join Date: Dec 2013
Posts: 47
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Go to the class A motorhome forum here and search for "reduced engine power." Happened to me and I learned a lot on this forum.
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01-24-2016, 07:23 PM
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#8
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Junior Member
Join Date: Jul 2012
Posts: 5
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Reduced engine power
My 2002 dolphin on the workhorse chassis with the 8.1 was having the same problem. It ended up being the crankshaft position sensor. Was a very common problem in Chevy pick ups with that same engine. Was a relatively cheap fix. Took quite a while to track it down.
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02-02-2016, 04:22 PM
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#9
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Junior Member
Join Date: Feb 2016
Location: Fernley, Nv
Posts: 8
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I have a 2007 workhorse 8.1L where is the crankshaft sensor located?
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03-13-2016, 11:25 PM
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#10
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Senior Member
National RV Owners Club Newmar Owners Club Triple E Owners Club
Join Date: Feb 2010
Location: VICTORIA, BC
Posts: 246
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Similar problem on my 2004 Dolphin 8.1 L. Replacing the frame mounted fuel filter fixed it.
__________________
2004 DOLPHIN 5320
2001 Dodge Dakota 4x4 Toad
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03-14-2016, 12:28 AM
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#11
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,140
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Did you get a Check Engine Light?
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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03-14-2016, 10:35 PM
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#12
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Senior Member
Workhorse Chassis Owner
Join Date: Apr 2010
Location: Casa Grande AZ
Posts: 246
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Loss of power
Sounds like the same problem I had. After two yrs of diagnosis to no avail, Jon @ the Workhorse performance site told me what to do. Remove the Mass Air Flow sensor and buy a can of special MAF cleaner and clean as directed. Cured my problem. driven now over 4000 miles without a problem.
Quote:
Originally Posted by Davea
2003 National SeaBreeze LX
50,000 miles 8.1 ltr Chevrolet vortex
While on trip to from Florida to Grand Canyon then to Maine then return to Fl. the engine lost power four times during the trip and coasted to a stop. Luckily we were always in a location where we could pull off, turn off engine, which would be idling then I would restart it like nothing happened.
Message on instrument panel stated; DIMINISHED ENGINE POWER OR REDUCED ENGINE POWER.
Has anyone else had this problem and if so what was the fix?
Any help appreciated
DAVE
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__________________
Alleyman; 2004 Dolphin 5355; Banks Power Pack, Ottominder; 405 Watts Solar, 2010 Explorer XLT Toad. four month boondockers!
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03-14-2016, 10:43 PM
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#13
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Senior Member
National RV Owners Club Newmar Owners Club Triple E Owners Club
Join Date: Feb 2010
Location: VICTORIA, BC
Posts: 246
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Quote:
Originally Posted by Arch Hoagland
Did you get a Check Engine Light?
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No, and you won't when it is a fuel supply problem. If you haven't changed your fuel filter in awhile - do that; it only takes a few minutes.
__________________
2004 DOLPHIN 5320
2001 Dodge Dakota 4x4 Toad
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03-14-2016, 10:45 PM
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#14
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Senior Member
National RV Owners Club Newmar Owners Club Triple E Owners Club
Join Date: Feb 2010
Location: VICTORIA, BC
Posts: 246
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Quote:
Originally Posted by dcmtfam
My 2002 dolphin on the workhorse chassis with the 8.1 was having the same problem. It ended up being the crankshaft position sensor. Was a very common problem in Chevy pick ups with that same engine. Was a relatively cheap fix. Took quite a while to track it down.
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Now that should bring up a Check Engine light.
__________________
2004 DOLPHIN 5320
2001 Dodge Dakota 4x4 Toad
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