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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 05-01-2008, 05:35 AM   #1
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Engine running rich. Possible cause = ?

I'm selling my truck and don't want any problems afterwards.

I keep getting a P0172 code (running rich).

I changed the dirty K&N and put back the stocker back in, and it went from throwing a CEL like twice a day to once every two days, or twice a week.

What could cause that?
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Old 05-01-2008, 07:38 AM   #2
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First thing Id do is clean the mass air flow sensor (MAF). Do some searching if you will. But, basically, its the unit which sits right behind the airbox and inline of the intake tube which runs to the throttle body.

Get electric contact cleaner or they actually sell MAF cleaner as well, spray it down, wait for it to dry, and reinstall 1 hr done deal.
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Old 05-01-2008, 07:51 AM   #3
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glad you ditched the K&N... such a waste of $$ and to top it off they can cause problems esp when over oiled..
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Old 05-01-2008, 05:30 PM   #4
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Like how rich? Black smoke coming from the exaust rich, I know it was enough to throw a code. You can also try the fuel pressure regulator. Good luck.
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Old 05-02-2008, 05:46 AM   #5
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No idea how rich, really... I don't follow myself

I'll clean the MAF and hope for the best.
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Old 05-02-2008, 10:03 AM   #6
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I walked in to that one.
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Old 05-02-2008, 11:43 AM   #7
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I know cleaning the MAF is the generic answer for everything but a dirty MAF will cause a lean condition not a rich one.

My bet is AF/O2 sensor if you want a generic answer. If you actually want to diagnose the problem then start with these items: fuel pressure (high), leaking injector, coolant temp sensor, exhaust leak before the O2 sensor. Any of these could cause a rich condition.

Contrary to popular belief, you can diagnose most problems without just throwing parts at the problem.

PM me if you need any service manual info. I can probably help out.
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Old 05-02-2008, 02:34 PM   #8
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Sounds like it needs more air, you definitely need a supercharger...
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Old 05-02-2008, 11:01 PM   #9
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Search Challenged

Checked Tech-Write-ups and searched Forum for MAF cleaning / write-up/pics. No can find....?
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Old 05-03-2008, 01:29 AM   #10
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Quote:
Originally Posted by turboale View Post
Sounds like it needs more air, you definitely need a supercharger...
LOL!

Nah, it's sold already, I'm just waiting for my Legacy 2.5 GT Wagon to arrive to let it go.
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Old 05-03-2008, 01:29 AM
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