• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Motorcraft Spark Plugs


Bob Ayers

Well-Known Member
Joined
Aug 28, 2007
Messages
2,274
City
Durham, NC
Vehicle Year
1999
Transmission
Automatic
There always seems to be a lot of "what's the best plug to use" threads. Overall, the top plug seems to be the OEM Motorcraft (which I believe).
I found something that might explain why the Motorcraft plugs run
better.

Check this out, one thing to notice. I picked a 2006 Ranger for this, but if you look at the recommended plug from Bosch, NGK, or Denso, they recommend the SAME plug for the 2.3L, 3.0L, and 4.0L. Only Motorcraft recommends a
different P/N for the 2.3L, 3.0L, and 4.0L:
SP439 for 2.3L, SP432 for 3.0L, and SP412 for 4.0L

So, the heat range is optimized for each engine with Motorcraft, NOT the
aftermarket plugs!

I'm of the opinion "close enough" only counts in horseshoes and hand grenades, NOT spark plugs!!
 
i have done many misfire repairs that someone has just used some crappy plug, normally bosch platnum, and the plugs need to be redone at their expense. can we say negative cost savings.....
 
The misfire story is pretty consistant with Bosch plugs. After buying my 1999 Ranger (used with 36K miles) it developed a misfire, only to find the previous owner had installed Bosch plugs. I replaced them with Motorcrafts, and haven't has a misfire yet!
 
wish I would've come on here and asked about plugs before I put the Bosh plugs in my rangers... doh! my 3.0 does have a slight miss, maybe i'll try going with the motorcraft... as for the 2.3 that was too much of a pain in the ass to change them again so soon. haha.
 
I put a set of Bosch platinum +4's in my park avenue and was amazed at how much they sucked! Had a miss right off the bat! I had to test these bad boys out on the car that was both my daily driver and had the hardest to plugs to get to! Sound familiar?

Anyways, Hank Hill uses autolite plugs in his ranger so end of discussion there.
 
so whats the number on the motor craft plug for a 90 4.0 also what about the ngk v power plugs
 
Ranger#1 said:
so whats the number on the motor craft plug for a 90 4.0 also what about the ngk v power plugs
Click to expand...

Motorcraft AWSF42P (double platinum) or Motorcraft SP486 (fine wire platinum). Plug gap is 0.054"
 
You must log in or register to reply here.

Similar threads

Motorcraft Fine Wire Platinum Spark Plugs
Replies
5
Views
3K
Bob Ayers
Motorcraft AGSF12FMF6 Spark Plugs
Replies
5
Views
3K
robmedina
robmedina
erik2282
Motorcraft spark plugs ''PP" suffix?
Replies
9
Views
7K
erik2282
erik2282
Motorcraft 2150 Spark Port
Replies
11
Views
5K
TenSeven
powerranger262
Motorcraft spark plug #
Replies
7
Views
4K
powerranger262
powerranger262

Sponsored Ad


Sponsored Ad

TRS Events

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Latest posts

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Ranger Adventure Video

TRS Merchandise

Follow TRS On Instagram

Latest Album Photos

IMG_0673.jpeg
IMG_0675.jpeg
IMG_0671.jpeg
85 ranger
85 Ford Ranger
PXL_20250409_152004355.jpg
IMG_9440.jpeg
IMG_4799.jpeg
20240803_195331.jpg
IMG_4778.jpeg
IMG_4779.jpeg
IMG_4780.jpeg

TRS Sponsors


Sponsored Ad


Sponsored Ad


Amazon Deals

Sponsored Ad

Back
Top