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[ 8 posts ] |
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Can a recessed plug cause cylinder to run lean?
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shooter
MMT Pro Member
Joined: Wed Jul 21, 2010 5:59 pm
Posts: 406
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 Can a recessed plug cause cylinder to run lean? I've been chasing an issue with the #2 cylinder running lean, pulled the head tonight and was surprised to see the plug about 1/2" from being fully seated. Thought at first that I had set the plug in and forgot to torque it down, but once I looked at the threads it's pretty obvious that they are so jacked up the plug couldn't have ever been fully seated.
Doesn't make sense that this would cause the cylinder to run lean, I'd think if anything it would run rich, but I feel dumber than a box of rocks sometimes.
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32 PD with EVT cam, decked heads, shaved pistons and not enough sense to leave things alone!
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| Thu Dec 19, 2013 2:52 am |
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Gray Goose
MMT Pro Member
Joined: Tue Feb 14, 2012 2:17 pm
Posts: 141
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Re: Can a recessed plug cause cylinder to run lean? if the plug was not sealing you could have been sucking in air through the treads on the intake stoke....So that could cause you to run lean just like a leak on the intake.
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| Thu Dec 19, 2013 9:03 am |
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pokey79
MMT 1000 Club
Joined: Mon Nov 15, 2010 4:50 pm
Posts: 2282
Location: Circumcised, Louisiana
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Re: Can a recessed plug cause cylinder to run lean? ^BINGO!!
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| Thu Dec 19, 2013 9:13 am |
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shooter
MMT Pro Member
Joined: Wed Jul 21, 2010 5:59 pm
Posts: 406
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Re: Can a recessed plug cause cylinder to run lean? Well good, maybe I can finally solve that problem. Prolly gonna get it helicoiled.
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32 PD with EVT cam, decked heads, shaved pistons and not enough sense to leave things alone!
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| Thu Dec 19, 2013 10:12 am |
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Jamie B.
MMT 1000 Club
Joined: Tue May 19, 2009 9:48 am
Posts: 2688
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Re: Can a recessed plug cause cylinder to run lean?
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| Thu Dec 19, 2013 10:13 am |
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kibb
MMT 1000 Club
Joined: Wed Jan 14, 2009 8:58 pm
Posts: 2731
Location: Lafayette, LA
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Re: Can a recessed plug cause cylinder to run lean? You may have not torqued it down. It could've wallowed the threads out. A guy at work had it happen and it shot his plug out.
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1644 WeldCraft / 27 GDLT
Ranger R71 / 125 Merc
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| Thu Dec 19, 2013 4:06 pm |
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cupped up
MMT 1000 Club
Joined: Tue Jun 05, 2012 7:25 pm
Posts: 4205
Location: St. Amant, LA
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Re: Can a recessed plug cause cylinder to run lean?
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| Thu Dec 19, 2013 5:20 pm |
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shooter
MMT Pro Member
Joined: Wed Jul 21, 2010 5:59 pm
Posts: 406
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Re: Can a recessed plug cause cylinder to run lean?
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32 PD with EVT cam, decked heads, shaved pistons and not enough sense to leave things alone!
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| Thu Dec 19, 2013 5:38 pm |
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