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Message: <blockquote data-quote="Hilltop NH" data-source="post: 93767" data-attributes="member: 13212"><p>I had the same problem maintaining high RPM's with my 99 LX665 when the temperature was below 30°F. I used this and a few other threads on the internet to trouble shoot the problem for three winters. Changing the filters the first winter seemed to help a little but didn't solve the problem. The weather got warm and I used the machine w/out incident. The second winter I replaced the rubber fuel lines, drained the fuel tank of old fuel and the replaced the filters again. The problem came back once the temperature dropped below 30°F and got worse the colder it got. Because of this I didn't use the machine much and missed out on making quite a bit of money due to the historic snowfall last year. So this year I was determined to find the problem. I moved upstream in the fuel system and had the still painted-in original injectors bench tested at the local D&W Diesel shop, turns out one injector was leaking and the other three were sticking shut. They rebuilt the injectors the same day for $340. I reinstalled them and noticed an immediate difference in starting and power but still had a slight stumble and loss of power at high RPM's. As it turns out I'd come full circle on the loss of power problem, the plastic in-line was clogged again. With a chuckle I put a new one in and now the machine runs excellent at any temperature. John</p></blockquote><p></p>