12-14 MPG Average?????

overtureZ · 12-14-2016, 11:42 PM

Quote:

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 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.

jchammond · 12-14-2016, 11:49 PM

Here's an intake pic,,,not oem- but you will see how air flows.

Sent from my iPhone using Tapatalk

jchammond · 12-14-2016, 11:53 PM

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.

jchammond · 12-14-2016, 11:55 PM

Just seeing you have HFC's,,,hopefully they are not clogged/damaged.

overtureZ · 12-15-2016, 03:04 PM

Update on it, 8 took it to get the codes pulled again and it's still saying bank 2 running lean.

ChaseZ · 12-15-2016, 05:27 PM

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

overtureZ · 12-25-2016, 11:07 AM

Update on this and my misfire issue. It was all due to a bad CRANKSHAFT position sensor!

Smashley · 12-25-2016, 08:24 PM

Quote:

Originally Posted by overtureZ

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?

overtureZ · 01-05-2017, 09:17 AM

Quote:

Originally Posted by Smashley

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.

12-14-2016, 11:49 PM	#17 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 59 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684396	Here's an intake pic,,,not oem- but you will see how air flows. Sent from my iPhone using Tapatalk SouthArk370Z likes this. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

12-14-2016, 11:53 PM	#18 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 59 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684396	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. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

12-14-2016, 11:55 PM	#19 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 59 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684396	Just seeing you have HFC's,,,hopefully they are not clogged/damaged. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

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12-15-2016, 03:04 PM	#20 (permalink)
overtureZ Enthusiast Member Join Date: Dec 2015 Location: Middle TN Age: 32 Posts: 319 Drives: Da Boosted Z Rep Power: 11	Update on it, 8 took it to get the codes pulled again and it's still saying bank 2 running lean.

12-15-2016, 05:27 PM	#21 (permalink)
ChaseZ A True Z Fanatic Join Date: May 2016 Location: Calgary Posts: 3,799 Drives: 16 370z Rep Power: 94685	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

12-25-2016, 11:07 AM	#22 (permalink)
overtureZ Enthusiast Member Join Date: Dec 2015 Location: Middle TN Age: 32 Posts: 319 Drives: Da Boosted Z Rep Power: 11	Update on this and my misfire issue. It was all due to a bad CRANKSHAFT position sensor!