Engine problems

[Enigma346]

So I was going to head out of town this passed weekend. Went to start it Friday and it started, made some loud sounds and ran rough so I cut it off. It won't cut back on. I'm hoping it isn't the timing belt/chain. Anyone have any ideas?

 

[1955moose]

What year and engine size? Any time you start hearing noises followed by a rough idle is never good. How many miles on the Expedition? First thing is make sure the oil is topped up. Beyond that you'll more than likely have to pull valve covers, front timing cover. You have timing chains, not a belt. Are you going to do work yourself? Was any engine work done recently?

Sent from my N9131 using Tapatalk

 

[Enigma346]

2003 4.6L. 162000 miles. Oil is good. I plan on doing the work myself with someone who knows about working on engines more than myself. Also, no engine with has been done recently.

 

[1955moose]

Loud sounds and running rough sounds internal. Possibly a slipped/ worn timing chain? If that happened, and one of the cams moved a tooth, that would make it run rough. Either way, you and your friend/ mechanic probably has some tear down, and inspection to do.

Sent from my N9131 using Tapatalk

 

[Enigma346]

Ok. That was a suspicion. I guess when this weather breaks we will start to diagnose. I appreciate it.

 

[Habbibie]

Can you describe the sound it made?

 

[Enigma346]

Rattling. At first I thought knocking but it was going pretty quick.

 

[Enigma346]

Forgot to mention, it sounds like the top end of the motor.

 

[1955moose]

Another common problem is a stuck/galled bore on one of the rear cylinder valve actuator's. These are overhead cam motors, but use these. Either way as I said earlier its tear down time. Don't run it any more, furthur damage can incur.


Sent from my N9131 using Tapatalk

 

[Enigma346]

Seems there are 4.6l motors with variesv amounts of valves. How many are in this one?

 

[1955moose]

2003 4.6/5.4 engines had 16 valves, 2 per cylinder. In 2004 the F150 was first with 3 valves per cylinder, Expedition following in 2005. 2004 was the last year for the smaller 4.6 mill in our Expeditions.

Sent from my N9131 using Tapatalk

 

[Enigma346]

Thank you. So mine has 16 valves. 2 per cylinder as you said. Makes looking up things easier.

 

[Enigma346]

It sounds like rockers about to fall out when it started that time on Friday.

 

[Habbibie]

Does the 4.6 have the same problem as the 5.4 with the chain tensioner or are they a different animal?

If it was a rattle that only lasts 3-10 seconds on cold start ups then I'm calling that as suspect #1

 

[Enigma346]

It was a rattle that later as long as it ran. Which it would only stay running for like 10 seconds

 

[1955moose]

Habbibie, I was just reading about the same wear problems as the bigger brother 2 valver. The article stated its the usual suspects, dirty oil from neglect, and no drainback valve on the filter. This causes the plastic guides to wear down fast. That and the galling of one or more of the valve lash hydraulic adjusters, making them stick in their bores./Enigma, use a stethoscope or a long piece of 1/2 inch hose up to suspect valve cover. You need to isolate where exactly the noise is emanating from, as both are possibilities.

Sent from my N9131 using Tapatalk

 

[Enigma346]

We will inspect. Weather is just starting to break here. Hopefully get a chance to start the break down process and find out what it is. I appreciate the help from you guys and if you come up with anything else, please let me know. Open to all suggestions.

 

[Enigma346]

Ok. It's been a while since I've updated. Been so busy. But we finally got around to messing with it. Seems it was the timing belt guide. I'm buying a whole timing kit though

 

[08navigator]

Did you pull the passenger side timing chain off without securing the cam or removing roller followers? I may be wrong but this being an interference engine, your valves may have contacted your piston.

Sent from my Pixel XL using Tapatalk

 

[Enigma346]

So in other words.... I'm going to probably need to take it to a mechanic and pay a good amount to have it all taken care of? I didn't think this was a interference motor. Was told it wasn't online.... Not here though. Mother.....