My 1999, 3.0, 5-speed manual trans, 4x4 Ranger probably could use new plugs. I bought the vehicle new and I know they are the originals, never been out of my hands except for the phantom wiper switch fix.
The truck is driven mostly as commuter vehicle about 46 miles each way on the highway at about 75-85 mph. Gets consistently between 22.5 and 25 mpg. No ping, no problems and I want to keep it that way. Frankly the only reason I am even considering changing the plugs now, is that I have heard that if I wait too long, I might break them in the block trying to get them out. So, I will change them now and put anti-seize on the new ones.
I have not checked the plugs yet, but I assume they are the AGSF12PP wich are supposedly discontinued. Also, supposedly the replacement plug from Ford is a heat range hotter and I fear that with the mostly high speed driving that it may ping, gas mileage go down, damage the engine etc.
So, what plugs should I get that are correct ? I hope to just be able to go to the checker, napa or autozone and get the right ones, put them in and go another 100,000 miles with no pinging, 22.5 to 25 mpg and no problems.
The AWSF32PP is for the NON-FFV 3.0L. I had trouble with the AGSF22PP in my 1999 3.0L FFV ...the AGSF12PP (called out in my owner's manual) runs much smoother, and no pinging problem. I now have the new "fine wire" Motorcraft platinums (AGSF12FMF6), and they are running well!! I think the AGSF22PP is TOO HOT for the 3.0L FFV, and this might be one of the reasons for so many pinging problems!!
Bob posted this recently in another thread, and I know that he has given careful consideration to his choice of plugs (he also has a FFV/EDIS equipped Ranger). I would be inclined to follow his advice on the issue.
I went to the Ford Dealer parts department and the parts guy says that there is no such plug as the AGSF12FMF6 in his books. He says that the replacement plug for the AGSF12PP is AGSF22FMF6.
I also searched the internet and cannot find it. Maybe Bob Ayers could let us know where he found these plugs ??? Or is there another plug available of the correct heat range ???
I originally found out about the AGSF12FMF6 plugs at Sema in Las Vegas last November. I stopped by the Motorcraft booth to complain about Ford discontinuing the AGSF12PP plugs, and they told me about the new "fine wire" platinums. I then went to my local Ford dealer here in Durham, NC (University Ford) and they were able to order the AGSF12FMF6s for me. The AGSF22PPs run TOO HOT in my 1999 3.0L FFV.
You may want to do a search on the following URL for the AGSF12FMF6s:
One last thing bob,
I found the AGSF12PP for 6 bucks each which isnt bad. However, I wanted to get the AGSF12FMF6. Can you tell me who you ordered these from, if you recall, and if you made the order over the phone or internet. Thanks again!
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2007 Lariat F-150 SC 4x2
Dark Stone w/ Peublo Gold accents
One last thing bob,
I found the AGSF12PP for 6 bucks each which isnt bad. However, I wanted to get the AGSF12FMF6. Can you tell me who you ordered these from, if you recall, and if you made the order over the phone or internet. Thanks again!
I ordered the AGSF12FMF6 through my local Ford dealer in Durham, NC. If I remember correctly, they were $4.79 (each). Good luck!!!
The AGSF12FMF6 from fordparts.com are supposed to arrive tomorrow. What is the correct gap for these plugs ? Should it be the same as the original AGSF12PP plugs, or is there a difference ?
The AGSF12FMF6 from fordparts.com are supposed to arrive tomorrow. What is the correct gap for these plugs ? Should it be the same as the original AGSF12PP plugs, or is there a difference ?
Gap is the same 0.044" (0.042" - 0.046")
I hope yours runs as good as mine!!! Don't forget a little anti-seize compound on the threads, and a lot of dielectric
grease in the plug boots. Are you replacing the wires also?
I have the anti-seize. Never used dielectric grease before on plug boots. Does it make it easier to get the boots off next plug change ???
Dont think I will mess with the wires, the truck runs perfect even at 116,000 with the original plugs. Actually I think this 3.0 FFV is running better now than it did the day I drove it off the dealers lot, or at 10,000 miles. But just think it is a good idea to change them. I was mainly worried that if I left the originals in too long that I would break them trying to get them out. I took one out to check if it was the AGSF12PP, and it came out real easy.
THe plugs came today, I will probably put them in sometime this weekend. I will let you know how the old ones look, how it runs with the new ones etc. I am currently getting betweein 22.5 and 25 mpg at high speed highway. I will check and see if the gas mileage stays about the same.
I'll be putting in a new fuel filter and think it is about time to change the air filter. I change the fuel filter about every 15 or 20,000 miles. Same with the air filter.
Yes, the dielectric grease will keep the boot from sticking to the plug. The P/Ns for the OEM plugs should be AGSF12P in one bank, and AGSF12PG in the other bank. The OEM plugs are actually single platinum, with the center electrode platinum on the plugs in one bank, and the GND electrode platinum on the other bank plugs.
I suggest changing the plug wires while you are changing the plugs. These wires will be brittle after all those miles,
and just the physical stress from removing the boots off the plugs can cause problems with the conductive core, and insulation.
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