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#1990813 - 03/01/10 03:02 PM Spark plug gap?
124neta Offline
Over the Hill

Registered: 04/03/09
Posts: 4562
Loc: Crook County, IL
Almost 10k ago i swapped in some new Motorcraft plugs in the vic. I thought i was told that they were gapped from the factory. Recently ive noticed more and more "tune up" threads indicating the need for gapping.

After my tune up everything was running smooth and i assumed things were all good. But recently ive been struggling with a slight shudder. Ive been back and forth of whether its tranny related, or a misfire. Im leaning misfire/Dpfe now.

Could improper gap 8 thousand miles down the road be causing unwanted side effects?

I reverted back to stock from a 93 octane MZT tune, and this seems to have made the shudder pretty much unnoticeable.

Should I regap? should i put colder plugs in? any advice
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#1990815 - 03/01/10 03:07 PM Re: Spark plug gap? [Re: 124neta]
Ask_The_Shack Offline
Over the Hill

Registered: 02/26/06
Posts: 4799
Loc: Long Island, NY
Sure. Inproper gap can cause the electrodes for the spark plug to wear a lot quicker, and unevenly causing misfires, or poor spark. The gap should be at .054.

Good luck.
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#1990914 - 03/01/10 05:14 PM Re: Spark plug gap? [Re: Ask_The_Shack]
124neta Offline
Over the Hill

Registered: 04/03/09
Posts: 4562
Loc: Crook County, IL
Thought it was strange that it could have caused a problem thousands of miles later, didnt think about it slowly causing damage. I guess ill order up a new set of plugs, you got me thinking these are f-ed up now.

thanks for reply
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#1991028 - 03/01/10 07:25 PM Re: Spark plug gap? [Re: 124neta]
Fordiesel69 Offline
Over the Hill

Registered: 09/16/05
Posts: 3642
Loc: Erie, PA
More likly your cops or tc shudder. If the plugs are gapped 0.45 ~ 0.60 it will run just fine. Our state police just throw the plugs in at 0.45 and I have to pull them all out and regap them to 0.54". They still run the same. I have even taken worn ones at at a gap of 0.63" and they still ran ok, just a little rough on a cold day at first starup.
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