Slow RPM gain and rough idle, cylinders 2, 4, 6 not getting power

Tiny
CHRISTOPHER MURPHY
  • MEMBER
  • 2004 INFINITI G35
  • 3.5L
  • 6 CYL
  • 2WD
  • MANUAL
  • 147,000 MILES
Okay, so I replaced my spark plugs and after have been having a rough idle and wasn't sure what it was. Seeing some wires beat up on the mass airflow system I had it replaced, but I am still having the issue. The mechanic said there were no codes being thrown after that. However, as I went to drive away clearly it was still a problem and then the check engine light was flashing, due to cylinders 2 4 6 not firing all on the same side of the engine. Did I pull on something accidentally and now it might have a loose plug or broken wire? Maybe a bad ground some where?
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Friday, October 11th, 2019 AT 4:15 PM

3 Replies

Tiny
JIS001
  • EXPERT
I would recommend you look at the oil control valve on the driver intake side. Attached diagrams below. If the solenoid is faulty or your low on oil it will cause timing issues and misfires.

2004 Infiniti G35 Sedan

V6-3.5L (VQ35DE)

Components

Vehicle Powertrain Management Computers and Control Systems Variable Valve Timing Solenoid Description and Operation Components

COMPONENTS

IVT CONTROL

SYSTEM DESCRIPTION

System Description

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This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.

IVT CONTROL SOLENOID VALVE

Component Description

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Intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM.

The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve timing control unit or stops oil flow.

The longer pulse width advances valve angle. The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.
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Friday, October 11th, 2019 AT 11:36 PM
Tiny
CHRISTOPHER MURPHY
  • MEMBER
Would that shut the whole bank down? Also, what about a bad ground when I rev it it flashes the battery and brake light?
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Saturday, October 12th, 2019 AT 5:01 PM
Tiny
JIS001
  • EXPERT
If the variable valve timing is not doing what is suppose to then it will effect that one bank. As for the other lights, you need to have a volt meter to properly check the voltage.

https://www.2carpros.com/articles/how-to-check-a-car-alternator
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Sunday, October 13th, 2019 AT 10:23 AM

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