Engine running rich. Possible cause = ?
05-01-2008, 05:35 AM
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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?
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?
05-01-2008, 07:38 AM
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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.
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.
05-01-2008, 05:30 PM
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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.
Last edited by Yota Doc; 05-01-2008 at 05:31 PM.
05-02-2008, 11:43 AM
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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.
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.
Last edited by bwhyit; 05-02-2008 at 11:47 AM.
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05-03-2008, 01:29 AM
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