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Correct spark plugs

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Old 08-09-2018
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Correct spark plugs

Sorry to re-hash an old topic, but previous searches don't give me a definitive answer to the question. I have an '02 ranger xlt 3.0 v6 ffv. I'm seeing the Motorcraft AGSF12PP and AGSF22PP as the accepted plugs for my application. Is this correct? Thanks in advance.
 
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Old 08-10-2018
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Difference is the Heat Range, 1 is heat range of first plug, 2 is heat range of second plug, thats the only difference

Motorcraft Spark Plug part number decoder here: MotorCraft Spark Plug Information - Jim's Site

1-3 are colder plugs than 4-7

What that means, a colder plug has a shorter insulator so dissipates heat faster, but you want the tip to stay above 500degF and below 800degF, so too cold a spark plug can foul in some engines, and too hot a plug will cause pre-ignition.

The 3.0l Vulcan engine is a "pingy" engine, tends to ping/knock on regular 87 octane fuel, so Ford specs colder spark plugs, 1 to 3, there is an AGSF32PP that was also spec'ed for this engine

So if you notice pinging then go with the 1, if not then split the difference and go with 2
If you notice carbon build up on old spark plug tip then go with 3 or even 4

Spark plugs are DRIVERS CHOICE, Ford simply gives you a "starting point" for heat range AND best GAP, up to you to know your engine and driving habits
If you do alot of hauling you want a larger gap, lower RPM torque
If you are doing mostly highway miles, i.e. higher speeds then go with a narrower gap
+/- 0.005 is OK, even a change of +/- 0.010 is OK for specific use
 
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Old 08-10-2018
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Good info. Thank you, sir.
 
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