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CEL lean code on idle

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Old Aug 28, 2017 | 01:06 PM
  #21  
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Everyone is over thinking this!!!

get a scanner out and look at long term and short term fuel trims at idle and report back
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Old Aug 28, 2017 | 02:08 PM
  #22  
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Originally Posted by T/A KID
Everyone is over thinking this!!!

get a scanner out and look at long term and short term fuel trims at idle and report back
Im gonna bring it to my tuner, if he cant figure it out this time i gotta data log. I was tryin to get by without spending the money on a datalogger/tuner.

Last edited by Liter of cola; Aug 28, 2017 at 02:09 PM.
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Old Aug 28, 2017 | 07:05 PM
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Wow, thought for sure that you had an issue with oil in your air intake...this one is really odd.
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Old Aug 29, 2017 | 09:49 AM
  #24  
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There may be a vacuum leak either on the intake manifold or throttle body. Also, check for header leaks ahead of the O2 sensor.
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Old Aug 29, 2017 | 12:00 PM
  #25  
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If these c7 cars are like the c5 & c6 with that 103 T.B. on it, it took along time for the tuner to work out the tuning problems with the 102 T.B. on the c5 & c6 it was in the tune on cold idle & in the VE table.

More than one guy pulled them off the c5 I was one of them tuner couldn't get it worked out for some time. But I say in the tune.. Robert
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Old Aug 30, 2017 | 07:55 PM
  #26  
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Those large 103 TBs are a major PITA to smooth out.

Elmer
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Old Aug 31, 2017 | 12:04 PM
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I've done 3 103mm TBs so far and none have gave me any issues... I set the scaler and haven't had any issues... this Tq based system controls everything much better then the airflow system on the Gen 4
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