billy26

I recently bought a 2005 supercrew xlt 5.4. I am having lots of issues. My biggest concern is when I start it it revs up to 1500-2000 rpm and stays for a long time. When it does come down very slowly it still sits at about 800-900. After driving down road it will idle like normal I guess 500-600 although it kind of sounds like a diesel. Also Have had it happen twice where just at random won't start. Turns over like normal but nothing. try it 2-3 more times and vroom like normal. Only has 33,000 miles. Please help

Good old Bill

Actually had the privilege of wiewing and listeneing to the 5.4 3V today, an impressive engine. My up to date knowledge is in the infant state. Am sure the qualified will be along. Have a good friend, 30 years with Ford, retired now, he absolutely kills me when he starts his engine. He waits for ever for the high idle to come down to normal. Uncertain of elapsed time. What I did hear today is a very noisy engine, at idle with the hood open. Believe it to be from the injectors as is posted several times here on the site. Suggest using the search button for more info. I am asking from other readers, can this be retaught in the computors logic. Another question that I have, is the PS reservoir, with the engine idling it displayed alot of bubbling, is this normal?

rplatt56

yes the bubbling of the PS reservoir seems to be normal......... every truck ive seen has it

torkum

Sounds like you are having a "cam phaser" problem. Go by the dealer and have them listen, they have heard plenty of bad ones.

Good old Bill

Hey torkum, is the cam phaser located right next to the oil cap. Was wondering what that was and you say they are apt to make noise?

torkum

They are located between the cam gear and the cam, so yes you could hear one next to the fill cap. Yes they make noise when they are having problems.
The top sensor part is sticking up behind the gear:

Good old Bill

They, so there is one for each cam? Wish I had a camera. Just seen this electrical connector by the oil fill cap, assumed it was the phaser, guess I'm incorrect. What does it do? Replace the cam position sensor, replace the crankshaft position sensor? Help me out again.

torkum

The 3Vs do have a phaser for each cam and this explains what they do better than I can [just starting to learn about the 3Vs]:

What are cam phasers?
Ford’s cam phasers are specially designed, computer-controlled cam gears for all 2005 and newer Ford Modular 3 Valve engines that have the ability to adjust camshaft position while the engine is running. Since the modular engine uses two camshafts, two cam phasers are used.

How do they work?
Engine oil is pressure fed to the cam phasers through a series of passageways in the cylinder heads and camshafts. The engine computer controls a pair of solenoids that adjusts this oil flow into and out of the cam phaser’s control chambers, giving the ability to retard the cams up to 60 crank degrees.

Why did Ford put them in the engine?
When the cams are retarded 20-40 degrees during part throttle engine operation, it takes less power to turn the engine over. This helps to increase the engine’s fuel efficiency. Another power benefit is that the cam phasers allow the camshafts to always be in the best position for maximum power, regardless of what the engine’s rpm is. The engine makes more torque and horsepower and extends the high rpm powerband by an extra 800-1000 rpm.

billy26

What kind of moise would I be hearing if one was bad? Thanks for all your help

torkum

A metal rubbing sound that moves with rpms. Like a bad pulley but not as high pitched as a open bearing.