Possible fueling issues?

DIGItonium · 06-09-2015, 12:36 AM

I took a quick drive to my friend's house while treating the car like it is in the break-in period and boost no higher than 2 PSI, half throttle, and keeping the revs below 4k RPM.
https://drive.google.com/open?id=0B1...UjA&authuser=0

For comparision, here's a log taken BEFORE the maintenance work was performed.
https://drive.google.com/open?id=0B1...XzQ&authuser=0

From brief observation, post-maintenance engine idle is a bit higher between 725-800 RPM on average. However, A/F correction seems to be greatly improved (around 105% or so) after about 25 miles total driving. Slight idle bounce exists, but it doesn't seem severe enough to throw a code. There's absolutely no roughness, so engine feels pretty smooth.

Before maintenance, the engine idle was intermittently rough (felt like misfire) and shows up as slight bounce. I was already wondering about potential leaks before performing the work.

06-09-2015, 12:36 AM	#11 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 44	Cipher Log Observations: 6/8/2015 I took a quick drive to my friend's house while treating the car like it is in the break-in period and boost no higher than 2 PSI, half throttle, and keeping the revs below 4k RPM. https://drive.google.com/open?id=0B1...UjA&authuser=0 For comparision, here's a log taken BEFORE the maintenance work was performed. https://drive.google.com/open?id=0B1...XzQ&authuser=0 From brief observation, post-maintenance engine idle is a bit higher between 725-800 RPM on average. However, A/F correction seems to be greatly improved (around 105% or so) after about 25 miles total driving. Slight idle bounce exists, but it doesn't seem severe enough to throw a code. There's absolutely no roughness, so engine feels pretty smooth. Before maintenance, the engine idle was intermittently rough (felt like misfire) and shows up as slight bounce. I was already wondering about potential leaks before performing the work. __________________ Last edited by DIGItonium; 06-27-2016 at 01:26 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Having some issues with my 7AT	falconfixer	Engine & Drivetrain	21	04-22-2013 02:17 PM
GTM issues	spawn350	Forced Induction	80	09-27-2012 08:21 PM
MBC issues?	AWX Z34	Forced Induction	7	04-06-2012 10:13 PM
thinking of buying 370z, then GTM turbo's , but overheat issues,oil issues ??	Christopher	Nissan 370Z General Discussions	19	10-16-2009 03:55 PM
Initial Z issues that are now non-issues......	cave vulture	Nissan 370Z General Discussions	1	09-06-2009 10:19 PM