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Just happened this morning, then I remembered it happened about 2 yrs ago too. Going down the interstate, engine just warmed up, I let off the gas to coast then about 5 secs after I let off, it feels like someone turned off the ignition, but everything is on. I give it a little gas and away we go. Let off, 3 secs, seems dead again, a little throttle and we are gone. This happened about 4 or 5 times, then it stopped acting up and just drove fine. The truck is pretty much all stock cept for a little larger tire, bored 30 over and a stepped cam. I thought it was my remote starter acting up but double checked that while I was moving down the road. Put it in neutral once and let off the gas, it died, so I started it right back up and kept on going. Not really too worried since it went away again, but just in case, I would rather not destroy something that I could of fixed easier.
Any ideas?
Nope runs great otherwise than this morning. Idles smooth. Only get a little quirk once in awhile. Usually under hard braking, the engine will just die, but it will start fine and run fine.
It kinda sounds like a fuel filter. That would be the first thing I'd check, for that it's easy and cheap, if it still does it after, post again and let us know.
You are talking about the filter in the frame rail under the drivers door right? If so, I have read that you have to release the line pressure before you can change this. How do you do that, or do you even really have to?
Thats the one, u might even have one farther back, I do. So I have two. I don't know of a way to release pressure other then to just disconnect the lines. Do the one on the motor side of the filter, it will drain slower, making less spray. I just pull mine off and get wet-lol.
Also, u might want to disconnect your batt, u don't have to, but it will lessen your chance of having a fire-lol
To release the pressure, the easiest way is to remove the fuel pump fuse and crank the engine...it should fire up then die pretty quick. I think you may also need a special tool to release the fuel filter...at least later years do.
In my experience, though, the fuel filter being clogged tends to lead to a loss of power when fuel consumption is high (ie WOT) and the loss of power continues to happen at lower and lower fuel demand levels as the filter progressively clogs.
You are saying it's on and off like a switch, then worked fine. This kind of sounds like something electrical...loose corroded wires, failing sensor, bad or missing ground straps, etc.
I've had many bad filters cause the exact simptoms he said above. I know it sounds weird, but my '86 Ranger used to do it everytime the fuel got clogged. My bronco hasn't yet cause I've been changing them regularly.
That '85 should not require the quick-release tool to get the filter off. It should have a plastic duckbill clip on each side of the filter, and the other filter twists off to expose the element.
I'll check the Haynes manual when I get home. Thanks for the help guys! I wouldn't of thought of the fuel filter.....figured it was something electrical somewhere....hopefully not..bet then again..the fuel filter hasn't been changed since i bought the truck about oh......4 yrs ago? OOPS!