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Newmar Dutchstar (gas) loss of power Ray 5-24-17  
We have a 30' Newmar Dutchstar (gas) 1999 model with a 1997 chassis. It will experience loss of power,check engine light comes on, hesitation and an eventual backfire. Turn it off and right back on and it will drive fine for about 100 miles and then repeat. On a long drive it eventually happens more often. Also tried kicking it into neutral, turn off switch, and re-start and problem would go away for another few miles, then do it all over again. We finally made it home 1200 miles later, just barely. It is an OBD1 and no codes are showing up. Mechanics we could find on the way home replaced an O2 sensor and fuel filter. Had a complete tune-up 1800 miles before this started. Have since replaced the coil and fuel pressure regulator. Ford mechanics can not find anything wrong and do not want it back lol? Could it be fuel injectors going bad, ECM problems? I saw Johnny had the same issue dated 10-26-14.
Re: Newmar Dutchstar (gas) loss of power Lorin 8-21-17  
Ford had a lot of trouble with EGR valves these years. Your heavy-duty chassis may not have an EGR valve, but if it does try pulling the vacuum hose to disable the valve. Block off the vacuum hose (golf tees work great). If the problem goes away you've found your problem. They also had big problems with IAC (Idle Air Control) valves. Disassemble the valve and give it a good cleaning with auto choke cleaner and a stiff brush. After cleaning it will take a few miles of driving for the computer to re-learn correct idle. Strange that there are no codes even though the check engine light has illuminated. Pre OBD-II Ford computers do some strange things. California Air Resources Board had to threaten Ford to get them to change their programming.
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