could anyone tell me where the spark plugs are on a 4.6 liter? i cant see them at all so i was thinking i would just have to have them done somewhere.

 

They are each side of the engine, where plugs are in any other v8 car. I believe the 99+ 4.6's were a coil on plug setup though, so you wont see any "traditional" style plug wires. Start bby looking at the top of your valve covers, then down the side of them on the side towards the fender. Your plugs will be down next to where your headers are bolted on at. You will see four black plastic circular things per side. Those are your coil on plug thingys (very technical term there ) I think you just have to be very carefully pull those off the plugs, then replace the plugs as normal.

With a 2v 4.6 be very carefull not to over torque the plugs when putting them in, and go back and recheck them in a day or two after replacement. I believe the torque specs on the plugs is 11 lbs, but dont qoute me on that. The 4.6s have been known to throw a plug out of the cylinder head, which can lead to very expensive damage. Just be sure to torque them correctly and you should be ok.

Also, make sure the engine is COLD when you go to change your plugs. I havent seen it personally happen, but I have read that aluminum heads can be damaged by removing or installing plugs when the heads are good and hot. Once again, that isnt the gosphel by any means, but why take the risk.

Finally make sure you use some antisieze on the plug threads. It can make the next time you change the plugs a heck of alot easier.

As far as tools needed, get one of the swivel plug things from your local autozone, advance , oriellys, whatever is in your area. It is basically about a 18" - 24" extension with a swivel plug socket on the end of it. This will make it MUCH easier to change the plugs. If you dont you will find your self rounding up two or three 8" extensions in order to reach the back plugs. Even then it will be awkward without a swivel. Buy the tool, if you have a 4.6 and plan on doing the plugs yourself, it is a very worthwhile investment.

 

Joker got it right.

Also to remember, when removing the coil packs, they will come off without having to move the fuel rail.. you will think it wont, but it will. Just pull the coil pack up some, and pull it towards the outside and it will come out.

 

Sounds kinda stupid, but do they say coil on plug, or cop on top of them? I have never changed any on one of those cars, but it seems I saw one that had that on it

 

Now they dont say either on them. They say like Motorcraft. Its hte round black thing next to teh fuel injectors (if you know what those look like.

 

mine are in the middle of the valve cover of course thats the 34v cobra motor.

 

Umm 04 cobras have a 32v engine, not 34v

 

typo would be my guess. Yeah changing plugs on a 4v motor is a tad different, but even easier than a GT. 4.6's are acctually really easy to work on compared to alot of pushrod motors.