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Old 06-09-2013, 02:34 PM   #1
cabin_guy's Avatar
Join Date: Jun 2010
Location: In the woods, Muskoka Ontario
Posts: 41
new plugs making it tick

2005 unlimited 4.0 L

decided to treat it to some 7034 double platinum plugs.
Pulled out the old copper tops which still looked ok.
Gaped the new ones to 34, put in the new ones with a conservative amount of anti-seize on the threads and a little dielectric grease on the ceramic.
Fired it up and it was ticking bad
Pulled out the plugs, they looked ok, gap still at 34.
Cleaned up the old ones gaped them to 34, installed with anti-seize and grease. Ran fine.
Any idea why the new ones would make it tick bad?
My first thought was that the plugs were hitting the pistons but with no gap change and no damage to the plugs that seems doubtful.
Was 34 the wrong gap? From what I read on here it is right, however out of the box they were about 38.
thanks for any advice

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Old 06-09-2013, 02:50 PM   #2
OhSixTJ's Avatar
Join Date: Mar 2013
Posts: 1,110
Maybe you didn't put one of the boots over the plug when you changed them. I didn't and it ticked. Found I had missed the 2nd to the last boot.

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Old 06-09-2013, 03:18 PM   #3
Knows a couple things...

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Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 37,240
Antiseize can cause problems since it is conductive. Even a tiny dab of antiseize getting past the threads near the electrode can wind up in the wrong spot & cause ignition issues.
When you have a choice, buy American.

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Old 06-09-2013, 03:47 PM   #4
miketx's Avatar
Join Date: Oct 2011
Location: Allen, Texas
Posts: 109
Jerry and OhSix both have good advice. When I changed my plugs 2 years ago, I almost didn't get a few of the plug wires "snapped" onto the plugs. I double-checked everything and figured this out.
'98 Jeep TJ Sahara, 31s, 2" lift, SRC front/rear bumpers with carrier, KC Daylighters and driving lights
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Old 06-09-2013, 05:15 PM   #5
cabin_guy's Avatar
Join Date: Jun 2010
Location: In the woods, Muskoka Ontario
Posts: 41
Thanks for your replies. Sounds like I maybe just got sloppy with something, missed a boot or got anti-seize on the electrode. I'll try it again next weekend and be extra careful.
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Old 06-09-2013, 06:30 PM   #6
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Join Date: Apr 2013
Location: Mississippi
Posts: 189
You missed a boot. It's pushed to the side of the plug.
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Old 06-10-2013, 04:11 AM   #7
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Join Date: Aug 2012
Location: Ellington, Connecticut
Posts: 1,448
^yes....and no way a piston can contact a spark plug.

I got good results by using a small model airplane brush to apply the dielectric grease to each plug's ceramic after the plugs were installed. boots slid on and clicked so easily.

2002 Wrangler Sahara, all stock, 5-speed, Dana 44, dual tan tops, 2nd owner.

2008 Hemi Grand Cherokee Limited 4X4, Quadradrive II, original owner, 24,000 miles.
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