Hunter Knight

Hey guys, I have been in Jacksonville for the past few days few days and while I was there the engine started to have a misfire on cylinder 3. So yesterday I was on the way home and I noticed the truck starting to lose some power and kinda sputtering. I had been cruising about 70 and then it went down to 65 after about 15 minutes and then to 60 and so on. So I decide to pull over and see what the problem was. When I stopped I killed the engine and then tried to start it back up and it wouldn't go. I tried a couple more times and nothing. It's turning over strong and sounds like it's about to fire right up but then it won't. Could driving with the misfire have done something? Any thoughts on what the problem might be? Thanks in advance.

STSCDave

https://www.f150forum.com/f12/2007-4...-start-311269/

Mine ended up being the fuel pump. A week later fuel pressure sensor failed.

Hunter Knight

I check clef the fuel pump earlier today and it was working and then I put a new fuel filter on and it was still doing the same thing. So I'm thinking the fuel is getting there but the fire isn't there to start it up. Any idea on what it might be?

STSCDave

If you are getting fuel the next thing is to check for spark in all cylinders.

Hunter Knight

I know it has a misfire on cylinder 3 but I didn't think they would affect all of them so soon

STSCDave

I'm looking at my Haynes repair manual and for a no start condition where the engine rotates it says to check for:
Fuel in tank
Fault in fuel injection system
Battery discharged
Battery terminals loose or dirty
Fuel pump
Moisture/damaged ignition system
Bad spark plugs
wiring in starting circuit
wires on ignition coil
contaminated fuel

Hunter Knight

Thank you for that. I will check those out tomorrow.

STSCDave

Most of the major parts stores will probably let you borrow a spark tester. They might charge a deposit.

Hunter Knight

Yeah it's has been sitting at home. It's wont start at all. All it will do is sound like it's turning over strong like it's about to start up but it will never actually start up. Would it do this if it had a bad timing chain?

Martian

Depends on the timing chain issue. If it snapped, you'd hear a lot more noises than a clunk and it sure wouldn't be a gradual deceleration like that. If it was off time a little, it would still run, just rough (unless it was off time a LOT... but then again, you'd hear lots of noises). So I don't suspect that.