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12-14 MPG Average?????

Originally Posted by jchammond Have you had the upper plenum off, or installed a CAI recently? the po300 random cylinder misfire could be any different one.....or did it say cylinders

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Old 12-15-2016, 12:42 AM   #16 (permalink)
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Quote:
Originally Posted by jchammond View Post
Have you had the upper plenum off, or installed a CAI recently? the po300 random cylinder misfire could be any different one.....or did it say cylinders 2,4 & 6 only (bank 2 cylinders) ?
Berk HFC and AAM short tails but they have been on there since like 20k miles and the issue just started happening. Once I changed out drive (US) side MAF sensor, all the problems cleared. But now I have horrible gas mileage.
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Old 12-15-2016, 12:49 AM   #17 (permalink)
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Here's an intake pic,,,not oem- but you will see how air flows.


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Old 12-15-2016, 12:53 AM   #18 (permalink)
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You also don't want to just start changing parts to see if it corrects problem w/fuel milage,,,As SouthArk first suggested to test values of O2's & run a test....would be first step...I'm not sure if you had your ~Z~ Tuned,,,but a re-tune on Dyno would definitely help.
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Old 12-15-2016, 12:55 AM   #19 (permalink)
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Just seeing you have HFC's,,,hopefully they are not clogged/damaged.
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Old 12-15-2016, 04:04 PM   #20 (permalink)
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Update on it, 8 took it to get the codes pulled again and it's still saying bank 2 running lean.
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Old 12-15-2016, 06:27 PM   #21 (permalink)
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Probably stupid comment but you did reset the ECU to get rid of the codes afterwards right?

I have no idea why kind of mileage I get, except that it's going to get a lot worse lol
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Old 12-25-2016, 12:07 PM   #22 (permalink)
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Update on this and my misfire issue. It was all due to a bad CRANKSHAFT position sensor!
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Old 12-25-2016, 09:24 PM   #23 (permalink)
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Quote:
Originally Posted by overtureZ View Post
Update on this and my misfire issue. It was all due to a bad CRANKSHAFT position sensor!
How much is the part and how difficult to replace?
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Old 01-05-2017, 10:17 AM   #24 (permalink)
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How much is the part and how difficult to replace?
From the Nissan dealership it cost me $188.?? and it wasn't to bad but was a very difficult spot to get your arm and ratchet in.
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