Black deposits --> Mixture rich?
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Joined: Jul 2004
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From: Farmington, NY, US
Black deposits --> Mixture rich?
I have recently learned that the black deposits I see in my tailpipe and on my spark plugs is probably due to a too-rich fuel/air mixture. Is this user-adjustable? I would like to attempt to lean it back some on my own, if possible, before bringing it to the shop. kbmcdowell
Farts in the shower
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From: Colorado
Re: Black deposits --> Mixture rich? (kbmcdowell)
If you have black, dry deposits you have:
An overly rich mixture (unburnt fuel becomes soot), low compression, clogged air cleaner or a large plug gap.
If you have black, wet deposits you have:
A breached head gasket, worn rings or pistons.
My guess would be its a dry deposit nad first thing I would do is check your air filter then plug gap then compression.
An overly rich mixture (unburnt fuel becomes soot), low compression, clogged air cleaner or a large plug gap.
If you have black, wet deposits you have:
A breached head gasket, worn rings or pistons.
My guess would be its a dry deposit nad first thing I would do is check your air filter then plug gap then compression.
Farts in the shower
Joined: Jun 2003
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From: Colorado
Re: Black deposits --> Mixture rich? (kbmcdowell)
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From: Michigan State University, USA
Re: Black deposits --> Mixture rich? (VRDrvr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VRDrvr »</TD></TR><TR><TD CLASS="quote">http://www.ngksparkplugs.com/t...y.pdf
look at your plugs
</TD></TR></TABLE>
or you can do what i did...buy "Champion Platinum" plugs for dirt cheap. then you look too see the gap is a bit smaller.....smaller gap = no big deal, so you but them in 
look at your plugs
</TD></TR></TABLE>or you can do what i did...buy "Champion Platinum" plugs for dirt cheap. then you look too see the gap is a bit smaller.....smaller gap = no big deal, so you but them in
Thread Starter
Joined: Jul 2004
Posts: 3
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From: Farmington, NY, US
Re: Black deposits --> Mixture rich? (VRDrvr)
Thank you Ken, the plugs were at around .040, and needed to be bumped up to .044. That part is done. On your suggestion, I took a look at the air filter, and woo hoo there it was. Plugged up something fierce. I put a new one in, and replaced the PCV valve as well, and no more black smoke. Thanks!
kbmcdowell
kbmcdowell
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