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Old 06-04-2016, 11:13 AM   #1
National RV Owners Club
Join Date: Apr 2016
Posts: 31
Losing Power

Just bought 2005 35' dolphin in Az. last month with 30,000 miles. We where going to drive it to Alaska but after an unfortunate accident had to cancel summer plans. I am having my son in law drive it from Az. to Co. to store it out of the heat of Yuma ( 117 today ). The first 300 miles ok, now states at times losses power ( does not miss ) then after a bit will regain power. Ck engine light did come on and will have checked out when he gets there. He says when it happens he holds pedal all the way down and it finally picks back up.Any suggestions, he still has to climb routon pass?

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Old 06-04-2016, 11:57 AM   #2
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National RV Owners Club
Ford Super Duty Owner
Join Date: May 2007
Location: El Cajon CA
Posts: 1,820

2007 Sea Breeze LX 8321 Ford Chassis
2004 Ford Ranger Edge
El Cajon CA.
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Old 06-05-2016, 08:38 AM   #3
National RV Owners Club
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It is a workhorse, I am leaning towards the mass airflow sensor? Good news is it did make it to Colorado. I will post when I get it looked at.
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Old 06-05-2016, 08:50 AM   #4
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National RV Owners Club
Workhorse Chassis Owner
Join Date: May 2016
Location: Godfrey IL.
Posts: 15
The first things to check is the fuel pressure regulator on the rear drivers side fuel rail. With the engine running pull the vacuum line off. If gas comes out then that's the problem. Be ready to put the line back on because it can really push some fuel out. I had the same problem you described. If it is bad I would go ahead and replace the spark plugs. Mine were black from all the excess fuel.
2003 National Dolphin 6355LX Workhorse 8.1 Vortec connected to an Allison.
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Old 07-02-2016, 03:47 PM   #5
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Sounds similar to my 04 Dolphin Workhorse. From service records of previous owner he had the same problem and spent a lot of money on new fuel pump, fuel filters,etc. Same loss of power happened a couple of times to me and my mechanic changed the mass air sensor and it has never happened again. He said the original error computer codes he saw on old invoices should have alerted previous mechanics to the problem.
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Old 07-02-2016, 10:26 PM   #6
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National RV Owners Club
Workhorse Chassis Owner
Join Date: Dec 2008
Posts: 292
Before you start throwing money at this thing, have someone plug a computer in to the OBD and find out what the trouble code is. Since the check engine light came on there will most certainly be a code in the chassis computer. You may be right about your guess on the sensor, but these parts are too expensive to just guess. The OBD plug will most likely be around the left side of the steering column....you may have to hunt around a little bit to find it.

2005 SEABREEZE LX 8360
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Old 07-03-2016, 08:30 AM   #7
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Workhorse Chassis Owner
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A missfire at hyway speeds probably won't be felt but will lose power. Have the OBD checker it will tell you if it's a misfire or lean condition.
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Old 07-03-2016, 12:25 PM   #8
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Have had this happen to me with the check engine light coming on. Gas cap wasn't tight. That was all it was. Check to see if a new cap is warranted.
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Old 07-20-2016, 10:41 PM   #9
National RV Owners Club
Join Date: Apr 2016
Posts: 31
Losing power

Finally for the Rv in and it was the mass air flow, thanks for all the replies. My wife just got the ok to start walking after being run over here in Alaska a couple of months ago and we are going to fly down to Co. And take it for a maiden voyage. Very excited
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Old 07-21-2016, 08:24 AM   #10
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Join Date: Sep 2015
Location: Craig, Colorado
Posts: 74
I had similar problem. Loss power right after setting cruise and got a check engine light come on. I was down to 30 mph the last 90 miles home.

The key was to check codes. From what I know, check engine light is usually almost always pollution control. (gas cap, O2 sensor, mass air flow, catalytic converter).

Mine turned out to be O2 sensor. Hope this helps someone.


2004 National RV Sea Breeze 8341 35'
GM 8.1 Vortec Allison 1000
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