Posted by MF1155 on December 19, 2011 at 06:52:35 from (64.12.116.74):
I have a 5.4 gas in my 2003 F250. I have replaced parts till my head is spinning. I have No check engine lights on at all. When the truck starts up cold it runs fine, when it warms up a bit it "misses" under load, even in park when its warm the RPMS will fluctuate and its intermittent. It will idle at 1000 rpms, but the tach will move above and below the 1000 mark the width of the idicator - not much. Ive replaces fuel filter, injectors, and now the puel pump. Im running out of ideas....and with no check engine light I cant use engine analizer....help please.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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