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Old 09-11-2012, 11:57 AM
Jonathon1289 Jonathon1289 is offline
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Default 4.0 SOHC Replacement Plug Part Numbers

Before I get flamed...I have used the search button. Over 10 hours on here, other forums, and Google in general has left me beating my head against the desk.

What the hell is the replacement Motorcraft spark plug number to fit a 2009 Ranger 4.0 SOHC? The stock plug is Motorcraft SP-412 which is a Nickel plug - I may end up just reusing this if cannot find a better answer.

Things I know:
Waste Spark firing system- half fire up, half fire down. Single platinum is not the best option because have to reverse half the plugs (my understanding after reading several posts).

No auto store or Motorcraft have double plat plugs listed for my model year truck. But if I research a different year 4.0 then double plats are listed.

The OEM plug is a Motorcraft sp-412
Supposedly the SP-498 is a single platinum finewire that works to replace the stock nickel plug. But double plat is better as mentioned above.
Autolite AP5143 is a single plat cross referenced plug to the sp-412.

The 2009 2.3 engine has Autolite Double plat and Extreme performance plugs listed (Autolite pn XP104 and APP104).

The 2004 4.0 SOHC has Autolite XP5144 and APP5144 plus listed.

I would like to get the double platinum finewire plug, but cannot find a clear answer to the exact part to order. I only want Autolite or Motorcraft (I know they are basically the same) and needs plugs and wires. If I cannot come up with a definitve answer to what 'upgraded' plugs will fit correctly then I will continue using the OEM part number of sp-412.

Sorry for any confusion here, but multiple posts have left me confused and it seems that auto stores and possibly even Ford are confused on the compatible plugs for the 4.0. There are different length plugs for the SOHC and the OHV...
Thanks to any helpful insight!!

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By the way...I have looked up my truck on the Ford Parts website using my VIN and also called the dealership. I have not pulled a plug from my truck to verify the sp-412 part number, but all evidence points to it being the installed model plug based on conversation with Ford/truck manual/online research.
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  #2  
Old 09-11-2012, 03:10 PM
Jonathon1289 Jonathon1289 is offline
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The 2004 4.0 should be exactly the same as the 2009 4.0 right? I don't see why Ford would have changed things but I suppose the plug length/depth could be different.
An article I found said the engines are exactly the same from 2001 til present, anyone verify that? If so I will get the Autolite plugs I listed above as compatible with the old model truck.
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  #3  
Old 09-11-2012, 03:50 PM
rwenzing rwenzing is offline
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Default Re: 4.0 SOHC Replacement Plug Part Numbers

The fine wire nickel/platinum plugs work very well and are original equipment in many newer Fords. Compared to the earlier platinum plugs, they require a lower firing voltage and that leads to fewer misfires, less electrode erosion, longer plug life and potentially longer coil pack and secondary wire life. The lower firing voltage also means that no platinum is needed on the side electrode regardless of the polarity.

I think you'll find that the part numbers of many of the old double plat service replacements that were spec'd for the earlier years have already been superseded by Ford to the newer fine wires as well.

The best bet is to use exactly what the Ford Parts System currently shows for your truck. You may, however, pay much less (possibly half or less) if you source the same plugs somewhere besides the Ford dealer.
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  #4  
Old 09-11-2012, 04:59 PM
Jonathon1289 Jonathon1289 is offline
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Definitely going somewhere besides the Ford dealer. Was just checking with them on the part number. I find it surprising that Ford doesn't have a superseded plug listed.
Anyways thanks for the bit of info, I may just use the stock all nickel plugs and keep things simple.
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