Expedition 1999
5.4

1st problem. Pipe behind the water pump, coolant leaking, intake removal needed to fix it.

Problem solved supposedly. After a day of driving the truck big engine knock and its louder when I go faster.

Mechanic never returned calls

This time I decided to DIY.

All signs of spun rod bearing or main bearing.

Dropped oil pan and I found a thin 1/2 inch metal shaving, inspected all rod bearings and main, they are good, crank journals good, connecting rods, wrist pins no signs of up and down play, cylinder walls are good, all this work looking for a bad bearing and I am back to zero, I don't know what else could be. Oh torque converter bolts/nuts are tight. Spark plugs are good

Intake leak?? Exhaust leak??? Valve train????

Can somebody give me an advised..thank you.

Ford Expedition Eddie Bauer 1999 5.4 Engine knock - YouTube

 

If you have it back together put a mechanical oil pressure gage on it and see what you actually have for oil pressure. Then disconnect one coil at a time to find which cylinder is knocking. That's the worst noise I have heard in a long time.

 

The knock could be a rod bearing or you could've blown out a spark plug. Are any of the COPs riding a bit high when the engine is running?

 

Moto Mel, I will put it back together tomorrow and check oil pressure, I did pull the connector of each coil before but there was no change.

Alloro, rods and spark plugs are ok.

I am going to remove the valve covers and look for lifters, rocker arms or push rods.

thanks.

 

There is so much horrible noise there you could have a blocked oil gally to the heads causing the lifters to not pump up and make all that clatter but it does sound like all the rods are knocking, it could also be an oil pump failure, it seems that the mustang guys have that problem way more than anyone else.

 

Willing to bet its something with the valves/lifters. Somethings loose.

 

broken flexplate?

 

I did check the flexplate carefully and there is no cracks, I just came in from outside, put new oil and filter, tried to start the truck but the battery was dead.

My god feeling is I didn't have oil pressure because the oil pick up screen was clogged if not my next step is to remove valve covers.

 

Depending on how you use the truck, if the pickup screen was clogged you may have bigger problems than the top end. Did you check at least a couple of the rod and main bearings for wear? The rods need the top shell looked at for wear and the mains would show wear the most on the bottoms.

 

After being absent for two weeks .. I think.... I finally found the problem, first I checked all the connecting bearings, main bearings, OK, then I removed the intake manifold because somebody else did replace the coolant pipe that goes under, so I put new spark plugs, new gaskets.

Exhaust manifolds ..NO LEAKS.

Last night a removed the valve covers and I couldn't find anything wrong...BUT!!!!... I noticed the timing chain in the passenger its completely lose, on the driver side the guide has a red plastic piece that is missing on the passenger side.

 

Did you take pics?

 

I'll take pictures tomorrow, I have to bring a small impact gun, compressor and harmonic balancer removal tool from work, I got all pulleys removed but the harmonic balancer.

 

I had the same problem, and mine was the timing chain. Good luck, Bob

 

Hello senior ford mechanics, I am back.


I don't know what else to do, I have taken everything apart, the timing chain wasn't the problem, connecting rod bearings and main bearings are good, pulled the valve covers and all the components are tight, turn the engine and check every rocker, springs..etc.

Car running, disconnected every coil to find out what piston is giving me the knocking sound, didn't make any difference.

Changed spark plugs, same problem, vacuum leaks...none.

Used stethoscope and I can't find it.


No exhaust manifold leaks, replaced the intake manifold gaskets.

Flywheel is good., torque converter bolts are tight.


QUESTIONS.

Clogged catalytic converter?

Bad fuel?

Bad knocking sensor?

See my new video where the sound is not that bad as the first one.


thank you for any advice.


I am obsessed with this problem I know its easy to buy an engine.

 

99 Expedition 5.4L Mistery knocking sound - YouTube