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Old 01-30-2021, 02:06 PM   #12
Elbert Bass
Scooby Specialist
 
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

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Quote:
Originally Posted by jimmy12345678 View Post
Yes I do have an Autel MS906 scan tool and am capable of getting the live data readings, so I will check short and long term fuel trims, A/F and O2 sensor readings, MAF values, etc. while recreating the problem, as well as i-AVLS Duty Cycle and whether the solenoid is open or closed. Any other data PID's you feel would be handy to monitor?

I found something that COULD explain my issue in another thread on this site, tell me if this makes sense to you or if it's gibberish:



This would also explain my "rattle" at high RPM's like that and should be able to be seen by a scan tool but might not set a MIL. When the "rattling" noise was occurring one of the times and I really got on it going up a steep hill, the MIL came on and set the P0028 code.

I've checked all the heat shields on the vehicle and none are loose or rubbing on anything (been burned by loose heat shields before on customer's vehicles) along with the P0028 code setting during the noise occurring makes me certain is it a legitimate problem.

Have not tried driving with the MAF unplugged, what exactly would it mean if the problem went away with the MAF unplugged?

I WILL get to the bottom of what is causing this issue, I might not be the best diagnostic tech but I'm stubborn enough to not give up when there's a problem LOL
That post does not pertain to your engine, only turbo engines and FB engines after 2012. You do not have AVCS (variable valve timing). You have i-AVLS (variable valve lift). Two totally different systems/functions.

Please clarify, you never confirmed after the oil flush/change - do you still get the P0028 or not? I assumed it went away (my bad for not asking).
If you still get P0028 then swap the oil pressure switches on the oil control solenoids from left to right then drive it. Does the P0028 come back or does it change to P0026? Then we can proceed further. One step at a time.

Driving with MAF unplugged puts ECM in limp mode. A preprogrammed fuel mixture/ignition timing based soley on engine speed and throttle position. It is assumed that if the engine runs relatively normal in limp mode the engine is relatively good shape mechanically and the issue is related to engine control sensors and/or wiring for sensors.
Lets sort the P0028 first if that is still happening.
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