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Author Topic: spark plug gap  (Read 19841 times)

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LornesAV

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spark plug gap
« on: 10/13/10 07:23 PM »

Just got home from 400 miles doing it again tomorrow and my number 7 plug is misfiring. I am in the middle of changing them all. Can someone tell me the gap? Also which cylinders are turn off with the AFM.
thanks in advance
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2008 Z71

dapper2dan

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Re: spark plug gap
« Reply #1 on: 10/13/10 08:18 PM »

Hey dude.. I just change mine twice and its 0.60 for 5.3l 1500 4WD... Hope this helps..
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Didit

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Re: spark plug gap
« Reply #2 on: 10/14/10 12:36 AM »

If you buy stock iridiums, they are already pre gapped, and I believe the book calls for 0.40,

Didit
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LornesAV

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Re: spark plug gap
« Reply #3 on: 10/14/10 07:17 PM »

Finally found it in the manual last night. It is .040 for the iridiums. Drove today about 300 miles and the check engine light came back on. I didn't get one of the wires back on good enough.  :E:
 Still had 17.3 mpg, hopefully much better now.
So which cylinders turn off or is it actually that the valves are opened and the fuel turned off. 4 of the plug were oily, maybe this is why I loose oil between change and exhaust pipe is black.
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2008 Z71

MS03 2500

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Re: spark plug gap
« Reply #4 on: 10/14/10 07:46 PM »

I'll take a look about the cylinders cutout, but the oily spark plugs concerns me.
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2003 2500

LornesAV

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Re: spark plug gap
« Reply #5 on: 10/14/10 08:48 PM »

I don't like that I have only 56000 miles and need new sparkys. Number 8's a  :cuss: :cuss:
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2008 Z71

MS03 2500

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Re: spark plug gap
« Reply #6 on: 10/14/10 08:51 PM »

Have you every had over heating problems. ???
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2003 2500

LornesAV

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Re: spark plug gap
« Reply #7 on: 10/14/10 09:19 PM »

No I bought it with 31000 in March
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2008 Z71

Shanes 02 Avalanche

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Re: spark plug gap
« Reply #8 on: 10/16/10 08:45 AM »

Be sure to gap them at .040. I ran 2 sets of plugs at .060, Iridium's and platinum's. After 20k they were fowled. The iridium's were litterally melted. Once I went to .040 my plugs are lasting a lot longer. I did have my plug wire next to the steering shaft get damaged. The wire was touching the shaft so every time I turned the bracket would cut into the wire. Luckily for me I always carry my old wires in my toolbins for just such occasions.
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LornesAV

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Re: spark plug gap
« Reply #9 on: 10/24/10 04:54 PM »

Changed plugs and now getting 18-20 mpg before 16-18 and less down shifting. If tire really make a difference I should see even better mpg after Friday.  :woohoo:     :drive:
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2008 Z71
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