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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 08-11-2014, 01:40 PM   #1
JCO2185
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P2179 Code and then real rough idle

My check engine light keeps coming on, throwing P2179 code. I had Airraid intake, Elite Catch Can, BBK Long tubes with hi-flow cats, Doug Thorley catback, Trifecta tune.

I know the P2179 code is for the car running lean at idle. What i have noticed is that whenever i clear the code with my code scanner or through EZ Flash with trifecta, the next time i go to start the car, it idles extremely rough and the check engine light will flash. It even sounded like something clunking around in the exhaust. Not sure what that was, but after 5 minutes of the car idling real rough, it smoothed out. Of course the check engine light came back on after driving 20 miles.

I have heard that the Airraid intake causes the code, so i cleaned the MAF sensor. Didnt do anything and still threw the code.

Could it be the catch can? I checked all the connections and i didnt find any vacuum leaks. I dont know where else to look. Could it be something with my tune file? My car needs to get inspected soon so i need to get this figured out quickly.

sorry for the long rant!
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Old 08-12-2014, 08:47 AM   #2
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My check Engine light is one. No clue whats going on. Im going to take her in on Thursday.
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Old 08-15-2014, 09:39 PM   #3
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bump
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Old 08-18-2014, 04:54 PM   #4
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AIRAID its self shouldn't throw a code. At least mine never threw one.


When did the rough idle start? Was it soon after install? Or did it just one day start throwing a code associated with a rough idle?
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Old 08-18-2014, 05:03 PM   #5
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The P2179 code has been on for a while now. The engine only runs real rough after I clear the codes with EZFLASH. Then the code comes back...Very weird
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Old 08-18-2014, 05:20 PM   #6
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When did the code come on compared to when your mods were installed?
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Old 08-18-2014, 08:31 PM   #7
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From what I remember, the P2179 code started right around the time I put the catch can on.
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Old 08-28-2014, 01:03 AM   #8
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What's your LTFT % at idle for bank 1 and bank 2? What's your LTFT % at say 2000 RPM for bank 1 & 2 ?
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