Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Do you have a check engine light on?
Ok, do you have any idea what codes are being stored?
Also, did you use a maf sensor from the dealer when you replaced it?
Can you share the current codes with me please?
I would focus on the VIAS solenoid code. This is the one that actually opens the butterflies inside the chamber to give the car power under load. I am not saying 100% this is the issue, but have you done anything with it?Testing it or seeing if it's actually working or not?
It's not a great diagram, but this is mounted on the upper intake, then is has a vacuum line that runs over to the passenger side of the intake. You can see the lever it controls when vacuum is applied. If it's not opening this lever, the car is going to be a dog with no power at all. Get a helper and make sure it's pulling vacuum when accelerating, if it's not, check and make sure it's got power to it.
Please see the diagram, I will try to get a better diagram for you as well.
Heres a better diagram, it controls the power valve actuator.
Yeah, make sure the power valve moves when you step on the gas. If it doesn't then you have to check the solenoid to see if it's working if it's not sending vacuum she'll be a dog.
The 328 is the knock sensor, it's not really a problem and the P0300 might be caused by the VIAS not working properly
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So, it is pulling a vacuum when you rev the engine to the power valve?Can you move the power valve by hand or not?
It shouldn't have a constant vacuum that is the job of the solenoid, there shouldn't be vacuum until the computer tells it to switch the solenoid.
hat you need to do is put someone in the car because it has the electronic throttle, have them hit the gas quick and see if that arm is moving, if it is, then the solenoid is working like it should, if not, then it's not getting signal or the diaphram on the power valve is no good, OR it's dropped the screws that hold them in place inside.
This would be very bad.
It shouldn't have full vacuum all the time, if it does, you have to check and make sure the computer isn't grounding the solenoid all the time. You can do this with a test light and the solenoid plugged in. If it's grounded, there won't be power on the yellow/green striped wire. There should be voltage on that wire until the computer sends the ground signal.