99 4.6L 2WD

My truck stumbles and hesitates badly. I scanned a code P0302, Cillinder #2 misfire. No other codes came up.

What would be the most common problem for this, plug or wire?

How do i test a wire?

Also, what years had the problems of breaking plugs on removal?

 

04-08 were the breakage issues, 3v motors. Ours had the "spit out" issues. But can easily be avoided with proper installation.

How many miles on the plugs/wires?
If you have some miles on the thing, do your truck a favor and give it some new plugs and wires. Otherwise, you can test the wire firing signal with a light, or put a good plug in it and check it. You already know which cylinder it is, if the pockets are tight, pick up a new plug for a few bucks and set of wires.

 

does anyone have a link on here of a good thread with changing plugs, with pictures?

Thanks

 

This one covers the basics. Except, don't use anti-seize and you have plug wires instead of dedicated coils.

You can use it for the basics tho -

http://rmftc.com/howtos/sparkplugs/sparkplugs.html

 

Plug wires:

Check the plug wire resistance using an ohmmeter. Touch the metal connectors inside the wire boots with the meter leads to get a resistance value.

You should read at least 12,000 ohms per foot of plug wire but no more than 50,000 ohms total for a long wire; otherwise its resistance is worn down and you should replace it.

Good Luck

 

Thanks Jbrew. Is the removal of the fuel line and power steering res the same on my 4.6?

Also 5/8 is the size for my plug socket as well?

 

Yes, Yes and Yes Man.

 

do i have a separate coil pack where 4 plug wires plug into on each side?

Also what is the fire order for my 4.6?

 

What ????? Concerned

Here's how she's set up ~



So firing order would be = 13726548

 

The 2 small squares at the bottom of the chart that you posted, is that the coils?

 

YES, those would be the Coil Packs

 

If i go ahead and change my plugs and wires. Is it ok to leave the coil packs? I dont want to change them if they are fine

 

You can swap the 2 coil packs and see if the miss changes cylinders.

Highly recommended - Motorcraft plugs and wires, no aftermarket brands.

 

I took a look under the hood, since i saw on the diagram what plug was #2, and sure enough the plug boot on the #2 plug was not seated correctly, it was slightly raised, so i snapped it back in and have not had a problem all week, its been running great.

Im going to go ahead and change out my plugs and wires, i noticed that i have a/c delco wires on there now that were done a few years back.
I will replace plugs and wires with motocraft.

So i should be ok with my coil packs, since my misfire issue is gone?