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Old 06-09-2013, 02:34 PM   #1
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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
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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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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.
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Old 06-09-2013, 03:47 PM   #4
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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.
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Old 06-09-2013, 05:15 PM   #5
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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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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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^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.

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