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05-26-2009, 06:30 PM | #1 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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P0171
I swapped my 1ZZ throttle body back to the stock one, and ever since, I'm getting CEL P0171 when I idle for about 5 minutes. Aside from the TB, I haven't changed anything that I think would be causing this. Anyone know of any 'problem' areas to check for a fix to this?
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05-26-2009, 06:31 PM | #2 |
unplug the battery negative terminal, turn the headlight stalk on, and wait overnight before re-connecting the battery.
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05-26-2009, 06:32 PM | #3 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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The car runs rough (in cycles) at idle. It'll idle smooth, then go through a wave of roughness for a few seconds, then back to smooth, again and again. It's worse with the a/c on. The car has less than 3,000 miles on it, so I don't think it's clogged injectors or MAF or bad o2 sensor...
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05-26-2009, 06:36 PM | #4 |
did you read my post?
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05-26-2009, 06:38 PM | #5 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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05-26-2009, 07:39 PM | #6 |
P0171 is a lean condition. which means your getting not enough fuel or un-metered air into the engine after the mass air flow sensor. double check everything you touched make sure hoses are connected and not broken and i would pull that TB off again and check the gasket. just pulling the battery to clear the code wont repair the problem.
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05-26-2009, 07:44 PM | #7 | |
Quote:
One step at a time. |
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05-26-2009, 07:58 PM | #8 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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I'm hoping it's just the ECU needing to relearn the stock TB again
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05-27-2009, 11:11 PM | #9 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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No such luck. The car idled smoother today than it did before I disconnected the battery, but still rougher than normal. And the CEL came back at idle after driving a few miles. Ideas?
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05-28-2009, 02:06 PM | #10 |
Look for air leaks....thats more than likely the cause of your problem.
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05-28-2009, 04:18 PM | #11 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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05-30-2009, 12:57 AM | #12 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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I switched back to the 1ZZ TB w/ chip swap and adjusted the idle screw... still getting P0171 but the idle doesn't seem rough now.
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05-30-2009, 07:11 AM | #13 |
I guess make sure that the vacuum lines are all reconnected, I accidentally pulled the vent off of the valve cover once.
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05-30-2009, 12:33 PM | #14 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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The engine's idling smoothly now, but I'm still getting CEL P0171... where should I be looking for a possible air leak?
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05-30-2009, 01:10 PM | #15 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
Posts: 792
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Found it! The valve on the Husky filter I'm using as an oil catch can is for shit... leaks air like crazy.
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