answersLogoWhite

0


Best Answer

How to Change Spark Plugs on 4.6 & 5.4 Liter By Dave West I've replaced plugs on quite a few 5.4Ls now (the 4.6L with plug wires is similar) and once you've done a set they really are not as bad as they look. Contrary to what some people will say, you don't have to remove the fuel rails. The Coil on Plug (COP) assemblies will come out past the fuel rail. I take an old piece of seat foam and put it on top of the radiator support to the engine to allow me to lay on it without hurting my tummy. It makes the job way less painful. Start by removing the cover over the throttle body (the black plastic cover that says "5.4" on it). There are three 10mm head bolts that hold it on. Next remove the air intake tube from the throttle body to the air filter housing. You loosen the hose clamps at either end of it; disconnect the connector on the AT (about half way up the air intake hose), the pull out the small hoses that go into the air intake tube near the throttle body. Next remove the brace from the Power Steering reservoir to thermostat housing. There are three 8mm or 5/16" head screws that hold it on. Now you should be able to see the COPs. To remove the COPs you can use a 7mm or 9/32" wrench or nut driver or socket, extension and ratchet or all of the above. If you turn the fuel injectors to the side it will give you more room to work with the COPs. Unplug the connector on each COP by pressing the tab in and pulling on the connector. After you're done that just twist and pull the COPs out. A couple of the COPs on the driver's side and #4 on the passenger's side are a bit hard to get at but with some patience they will come out. After you've removed the COPs take a blow gun and blow out the spark plug holes. Don't be surprised if there is rust and junk in them. Next you can actually remove the plugs. Use a combination of extensions, swivels (universal joints), sockets and ratchets to get at them. Whatever works best for you is good. On the harder ones to get at I usually use a socket with a 4" extension, then a swivel, then a long extension, then the ratchet. The plugs are way down in the hole which is why I use the extension then the swivel. The swivel makes it easier to clear the firewall. Set the gap on the new plugs to whatever it says on your emissions decal on the radiator support....usually .052-.056". Apply a small amount of anti-seize to the threads only on the spark plug. You can use a piece of vacuum hose or fuel hose over the end of the plug to get it started in the hole. Carefully start the plugs in their holes. If you can't get them most of the way in by hand with the hose take a look and see why not. Cross threaded plug threads are no fun! The plugs are to be tightened to 13 lb-ft. which is just hand tight with a short ratchet. Don't over tighten them! The threads in the aluminum heads have enough problems as it is. After that just put everything back together in reverse order. Apply some dielectric grease to the plug boots as well to help seal them. I've done enough of these that I can replace the plugs in approximately 45 minutes but don't be surprised if the first time you do it takes a few hours.

User Avatar

Wiki User

15y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Expedition miss firing on one cylinder?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What is the firing order for a Ford Expedition v8?

The firing order for a Ford Expedition 4.6 V8 is 1, 3, 7, 2, 6, 5, 4, 8. The number one cylinder is at the front of the engine, on the left side as you face the car.


Where is the number one cylinder in the firing order for a 99 Chevy Tahoe?

the firing order is 1836572 Answer The #1 cylinder is on the DRIVER'S side..closest to the radiator.


What is the firing order on a 99 Camry 4-cylinder?

The firing order on a 1999 Camry 4 cylinder is 1, 3, 4, 2. The number one cylinder is at the rear of the engine.


2000 ford ranger 4 cylinder firing sequence?

The 2000 Ford Ranger firing order is 1-3-4-2. The number one cylinder is the one closest to the front.


Impala cylinder firing order 3.4?

The firing order for a 3.4 Impala engine is 1-2-3-4-5-6. The number one cylinder is the rear cylinder on the passenger side.


What may be wrong if one day one cylinder is not firing than the next day it works and another cylinder is not firing?

Normally, I would look first to the fuel metering system for the cause of this problem.


Where is the 1 cylinder on a 2001 Ford Expedition 4.6l engine?

The 1 cylinder on a 2001 ford expedition 4.6l engine. Is located on the Pass. Side. The first one you see.


What is the firing order for a 2003 Honda XR100R?

It is a single cylinder engine with one spark plug so there is no firing order.


Firing order ford 2.3?

#1 cylinder is the front one. the firing order is 1, 3, 4, 2.


Oldsmobile 1972 350 rocket distributor wiring diagram and firing order.?

Firing order for you're Rocket engine is 18436572 distributor rotation is counterclockwise. Cylinder one on the distributor cap points to cylinder one.


Dose the firing order start at the front or back of the engine?

Mostly Number 1 cylinder is the frontmost cylinder. Some older cars ( Alfa's are one ) the number one cylinder is the back cylinder


What is the firing order for a 1991 Toyota standard pickup 4 cylinder?

1342 number one being the front cylinder