JimT
Member
I have a 1999 Expedition with the triton 5.4 and roughly 145K miles. The vehicle was running fine, no codes, no loss of power, no pinging, no rattling and wasn't idling rough. The only thing I could hear was a very faint ticking that sounded like a lifter but not as pronounced, didn't accelerate with the engine when I picked the RPM's up and didn't happen all the time. I don't know if it was a symptom of if there is something loose somewhere.
I had the truck in the shop for a replacement of the power steering pump and at the time it was throwing a code which indicated that a vacuum hose on the top passenger side needed to be replaced. When we got the truck back it ran fine for about a week then suddenly wouldn't start. It would crank but not catch. I thought maybe it flooded so I let it sit and about 15 min later it started right up.
This went on very intermittently for about a month with the wait time being anywhere between 5 minutes and overnight. I did some research and opted to replace the fuel pump relay and it ran fine for a couple of weeks...then it happened and wouldn't start. I let it sit, still wouldn't start and after a couple of days of trying the engine adopted a different sound when it was cranking...kind of like the fuel pump had given out and there was no fuel getting to the engine.
Took it to the shop and the fuel pump tested fine. It's getting fuel, spark and air, and it still won't start. My mechanic thinks the timing chain jumped but the lack of any symptoms makes me question this.
Anyone have any ideas?
I had the truck in the shop for a replacement of the power steering pump and at the time it was throwing a code which indicated that a vacuum hose on the top passenger side needed to be replaced. When we got the truck back it ran fine for about a week then suddenly wouldn't start. It would crank but not catch. I thought maybe it flooded so I let it sit and about 15 min later it started right up.
This went on very intermittently for about a month with the wait time being anywhere between 5 minutes and overnight. I did some research and opted to replace the fuel pump relay and it ran fine for a couple of weeks...then it happened and wouldn't start. I let it sit, still wouldn't start and after a couple of days of trying the engine adopted a different sound when it was cranking...kind of like the fuel pump had given out and there was no fuel getting to the engine.
Took it to the shop and the fuel pump tested fine. It's getting fuel, spark and air, and it still won't start. My mechanic thinks the timing chain jumped but the lack of any symptoms makes me question this.
Anyone have any ideas?