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I just replaced the left(rear) valve cover for my 2007

I just replaced the...

I just replaced the left(rear) valve cover for my 2007 Nissan Quest 2 of the seals for the spark plug were cracked. After reassembling there is a noise like a balloon whining that stops while accelerator is depressed. I ended up with a P0406 error code. and rough idling. Any suggestions where to start? Thanks.

Mechanic's Assistant: Is the rough idle intermittent or consistent?

I want to say consistent but it gets worse the longer at a standing idle. And more consistent the longer it has been running. After initial starting not as bad.

Mechanic's Assistant: Are you fixing your Quest yourself? What have you tried so far?

I have not taken it back apart since replacing the valve cover Friday afternoon. But I am not sure where to start. I was thinking of going back through everything to make sure a hose or something may not be connected properly. I just have not had the chance yet. I was not doing this prior to changing the valve cover, but I had a misfire on fire that I attributed to oil getting into the spark plug well because of the seal crack.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That is as much as I got right now.

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Answered in 4 hours by:
3/11/2018
Clifton B.
Clifton B., ASE Master Auto Tech
Category: Nissan
Satisfied Customers: 4,833
Experience: ASE Master Certified Tech, Nissan Master Certified Tech, 12 yrs. experience in auto repair.
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Hi my name is ***** ***** i will be helping you today
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If you have oil in the cylinders you will need to replace the valve cover and just the gaskets
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If there is a bollon type noise and a miss then you most likely have a intake leak or a vacuum hose loose
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You should recheck your work to start
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If you have any more questions
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If not please rate the service before you go thanks
Clifton B.
Clifton B., ASE Master Auto Tech
Category: Nissan
Satisfied Customers: 4,833
Experience: ASE Master Certified Tech, Nissan Master Certified Tech, 12 yrs. experience in auto repair.
Verified
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