This has probably been asked before, but what is the correct motorcraft plug for my 1999 F-150 with the 4.6 Windsor? Auto parts stores list 2 different ones - SP413 (Original Equipment Nickel Spark Plug) and SP432 (Original Equipment Finewire Single Platinum Spark Plug). Truck only has 69,000 on it but being the tinkering type, I may change them soon.

 

I believe they are both the right plug, ones a nickle plated plug, ones platinum. I would opt for the platinum.

 

x1,000,000,000,000,000 for the platinum

 

Use the Iridium Fine wire. Motorcraft has one for yours.

 

Thanks everybody! I'll go with the SP432s. Kinda funny that they're the same price. Now I need to decide when to do them. I plan on cleaning the TB and checking the mpgs soon too.

 

I've got the 432's in my 97 4.6 and couldn't be happier

 

NO antiseize, 28 ft/lb.

 

Yea, their all good, some just have a healthier longevity. I'll list them -

1. Single Plat
2. Double Plat
3. Iridium

Iridium being the best. They still don't have Iridium's (Motorcraft) for the 5four, but I believe they do for the 4six, go figure. I had to go with Denso's for good fine wire. Good Plugs so far. Mileage went up a little for me, but that doesn't happen for everyone.

 

Who sells motorcraft iridiums? O'reilly, Autozone, and Advance don't list them online.

 

Have you tried Rock?

http://www.rockauto.com/

 

I guess they don't have the Iridium :o my bad. Here's what I list, -

SP413

MOTORCRAFT SUPPRESSOR SPARK PLUG, NICKEL, SOLD INDIVIDUALLY -- 0.044 in. gap size, alternative plug; Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; Resists corrosion and abrasion; Reduces the chance of misfire.

* Series: Suppressor
* Quantity Sold: Sold individually
* Product Fit: OE replacement
* Warranty: Motorcraft's 12-month or 12,000-miles warranty

Fits the following 1999 Ford F-150 submodels:

* 1999: XLT; 8 Cyl 4.6L; "CNG"
* 1999: XLT; 8 Cyl 4.6L; "GAS"
* 1999: XLT; 8 Cyl 4.6L; "VIN W"
__________________________________________________ _____

SP493

MOTORCRAFT SUPPRESSOR SPARK PLUG, SINGLE PLATINUM, SOLD INDIVIDUALLY -- 0.034 in. gap size, alternative plug; Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; Resists corrosion and abrasion; Reduces the chance of misfire.

* Series: Suppressor
* Quantity Sold: Sold individually
* Product Fit: Direct fit
* Warranty: Motorcraft's 12-month or 12,000-miles warranty

Fits the following 1999 Ford F-150 submodels:

* 1999: XLT; 8 Cyl 4.6L; "CNG"
* 1999: XLT; 8 Cyl 4.6L; "GAS"
__________________________________________________ _________

SP432

MOTORCRAFT SUPPRESSOR SPARK PLUG, FINEWIRE PLATINUM, SOLD INDIVIDUALLY -- 0.054 in. gap size, standard service plug; Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; Resists corrosion and abrasion; Reduces the chance of misfire.

* Series: Suppressor
* Quantity Sold: Sold individually
* Plug Type: Resistor
* Electrode Core Material: Copper
* Electrode Tip Material: Platinum

* Product Fit: Direct fit
* Warranty: Motorcraft's 12-month or 12,000-miles warranty

View more View less
Fits the following 1999 Ford F-150 submodels:

* 1999: XLT; 8 Cyl 4.6L; "VIN W"
__________________________________________________ ______

AWSF32E

MOTORCRAFT SPARK PLUG -- Platinum plus; A high quality, direct fit OE replacement spark plug; 12-month or 12,000-mile Motorcraft limited warranty.

* Quantity Sold: Sold individually
* Product Fit: OE replacement
* Warranty: 12-month or 12,000-mile Motorcraft limited warranty

Fits the following 1999 Ford F-150 submodels:

* 1999: XLT; 8 Cyl 4.6L;

 

For an Iridium, you would either go with "Denso" or "NGK". Like I said, ALL are good plugs. An Iridium fires better, longer. Stick within those tree manufacturers. -

Motorcraft
Denso Iridium
NGK Iridium

Motorcraft offers the fine wire plat. That's the best one there for Motorcraft.

 

BTW- I must have confused their fine plat for a fine wire Irid. Not sure, I thought they made an Iridium, for something ?

 

Ahh, here's their Iridium, but it's for the 5four, -

SP479

MOTORCRAFT SUPPRESSOR SPARK PLUG, PLATINUM IRIDIUM, SOLD INDIVIDUALLY -- 0.054 in. gap size, standard service plug; Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; Resists corrosion and abrasion; Reduces the chance of misfire.

* Series: Suppressor
* Quantity Sold: Sold individually
* Plug Type: Resistor
* Electrode Core Material: Copper
* Electrode Tip Material: Platinum

* Product Fit: Direct fit
* Warranty: Motorcraft's 12-month or 12,000-miles warranty

View more View less
Fits the following 1999 Ford F-150 submodels:

* 1999: XLT; 8 Cyl 5.4L; "BI-FUEL"
* 1999: XLT; 8 Cyl 5.4L; "GAS"

_________________________________________

That doesn't make sense yet tho lol. Not to me anyway.

 

Thanks jbrew! I'll prob stick with the motorcraft platinum to keep it less confusing for me. The SP432 plugs are $4.69 ea.