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Question on spark plug gapping...

 
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Old 06 May 2005, 08:03 pm
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Default Question on spark plug gapping...

I know, I know.. this has been gone over before... I just want to be sure I've got it right.

Just picked up some Champion Double Platinums as my local Advanced Auto ($4.48 each).

I've order a Screamin' Demon coil and live wires.

What would the correct gap be for the plugs with this new set up?

Do I also need to disconnect the negative battery terminal when I'm done doing the tune-up to "reset" the computer?

Thanks for the help.
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Old 06 May 2005, 08:23 pm
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Join Date: Mar 2003
Location: Rockford, Michigan, USA.
Posts: 146
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I recently had my Chrysler dealer install the Screamin' Demon coil and Livewires which I Purchased from Moss Motors. The instructions say to gap the sparkplugs at 0.65, which my dealer did. I didn't replace the original sparkplugs since I have about 19,000 miles. I also had the Stage 1 engine kit installed then so I don't know how much of the performance improvement is due to the coil and wires.

I don't get any sputtering or hesitation with the gap at 0.65 so I'd recommend sticking to Screamin' Demon's instructions. I'd also disconnect the battery terminal to reset your engine computer.

I'd like to hear how your installation went. I hope you like the results.
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Old 06 May 2005, 09:37 pm
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Do a search here and at other PT forums. The 0.065 gap for the Demon coil, while it will work, is wildly optimistic and besides, the Demon coil doesn't put that much more volts out than a stock coil (36,000 volts - OEM coil vs 40,000 volts for the Demon). Set the spark plug gaps to 0.040-0.045 and you will be more happy. Disconnecting the battery to reset the computer is pretty much standard procedure with any mod or before going on a trip. But try it both ways. If you don't disconnect the battery, all the previous "learned" settings will be there and you can compare if there is any improvement over the previous setup. Then disconnect the battery for a few minutes and then see how it drives. It should drive like new or better since everything will be back at baseline settings.
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Old 07 May 2005, 07:36 am
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You are better of with the stock coil...If you can send it back do it...also the MSD coil is not much better then the stock coil also.
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