Knock at idle

The G-Series Tuning Forum is the place to discuss G35/G37 performance modifications and mechanical repair.
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Headnsouth
Posts: 57
Joined: Fri Nov 07, 2008 10:35 am
Car: 2005 G35

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Replaced spark plugs about 10k ago and a bad cam sensor. 159K miles on my 05 G35. MPG around town is 18.3, I was getting 20 MPG. The vehicle runs great but I do get a knock at idle, it's almost like getting a bumper tap. No codes. Any ideas on what to check? I've always ran 83 octane and never had a problem. :confused:

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Headnsouth
Posts: 57
Joined: Fri Nov 07, 2008 10:35 am
Car: 2005 G35

Post

The problem finally showed itself. Intermittent rough idle along with the check engine light. Ran a scan and it was a 305. Swapped coil packs and the code switched to the other cylinder.
Picked up a new coil pack and all is good. :) Gas ⛽ mileage is back at 20.
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Headnsouth
Posts: 57
Joined: Fri Nov 07, 2008 10:35 am
Car: 2005 G35

Post

The problem finally showed itself. Intermittent rough idle along with the check engine light. Ran a scan and it was a 305. Swapped coil packs and the code switched to the other cylinder.
Picked up a new coil pack and all is good. :) Gas mileage is back at 20.
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