All, I have kind of a weird problem. We have a mile or so downhill stretch that when I go down - the engine starts running rough. It usually starts about halfway down and then continues for a short while after I hit the bottom.
Any thoughts about what might be causing that? Should I worry about it at all?
Thanks in advance for any thoughts you might have.
Are you using your engine as a brake with your foot off the fuel pedal. How steep is the hill.... is there any smoke visible.
__________________ http://photos.thedieselstop.com/show...0/ppuser/28329
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93 has 160K+, it's basically a stock truck with all the Ford options, just no disc player.
Toys: 26'Jayco FK TT, 18'Sylvan Pro Fish.
Usually I keep my foot on the gas pedal, since my gearing is low - it doesn't usually coast downhill at 65, so I give it a little fuel. The hill doesn't have any signs, so I'm guessing they do that at 15% in Cali? Just verified that it's a 7% grade, and I believe it's about a mile long. I thought I saw smoke once, but it's really hard to tell at 65. I could probably have a buddy follow me down if that would help.
Also, I have been switching fuels around - was using the cheap diesel guy - then had idle fluctuation issues - Brother in law had a spare commercial fueling card so I used that for a few months without issues. Also use b20 ocassionally as I hear it clears out the crap. Maybe it cleared the crap into the fuel filter? changed the fuel filter at about 10k miles ago. Also -noticed that there is an open metal pipe by the fuel filter - thought it might have been a vaccum thing - then realized that I think it's the water drain - my replacement fuel filter doens't have a water sensor tap on it - cuz I busted it when removed the old filter. So I have a fuel filter with no water sensor connection and an open pipe - maybe drain? It's connected to the pipe via ziptie and separated by a rubber space to the pipe that goes to the top of the fuel filter.
Can take pics if that helps.
__________________ http://photos.thedieselstop.com/show...0/ppuser/28329
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93 has 160K+, it's basically a stock truck with all the Ford options, just no disc player.
Toys: 26'Jayco FK TT, 18'Sylvan Pro Fish.
I had a better angle this morning and was able to follow the tube - it's basically a drain. I believe it used to be connected to the water separator section of the fuel filter.
I had same problem awhile back with a different motor than what I've got now. It was also a 7.3 idi though, it was out of time real bad hope this helps.
__________________
1992 F- 250 ZF 5spd,4wd,7.3 idi, K&N air filter, electric fuel pump, 3/55 gears, chrome nerf bars, Lund cab visor, Ranchhand headache rack, diamond steel bed rails/toolbox/tailgate cover, American Racing aluminium wheels,gooseneck ball in bed, v-5 hitch,cab lights. Motor is out of '91 F-Superduty unknown miles ,237,000 on truck.
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