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Rough idle after sitting.

Originally Posted by BrendenZ34 Hey so my 370z has been parked for the winter here in Illinois and I started it up for the first time I about two months.

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Rough idle after sitting. Rough idle after sitting.
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Old 03-01-2023, 08:12 AM   #1 (permalink)
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Hey so my 370z has been parked for the winter here in Illinois and I started it up for the first time I about two months. Car has been sitting since late October. When I started it up it had a rough idle and after several minutes the check engine light came on. Can someone help possibly diagnose this I can get code soon here but I bet it's just gonna be that pesky PO300 code. I was wondering since gas can go bad in 3-6 months of sitting is that possible? I doubt I'd need to spark plugs as it has 30k miles but I'm open to suggestions. Anything feedback helps thank you.
My bet would be map sensors.
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Old 03-01-2023, 10:22 AM   #2 (permalink)
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If you have a code. You need to know what it is before going any further.
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Old 03-03-2023, 03:28 PM   #3 (permalink)
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My bet would be map sensors.
You might want to remove the air filters and check for obstructions like a mouse nest. Been finding these lately in various cars no matter where they are stored. Good luck and get that OBD code and post it.
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Old 03-04-2023, 08:07 AM   #4 (permalink)
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You might want to remove the air filters and check for obstructions like a mouse nest. Been finding these lately in various cars no matter where they are stored. Good luck and get that OBD code and post it.
It was the PO305 code cylinder 5 misfire any ideas on what could cause that? Obviously spark plugs and coils are possible but given the mileage and it sitting I feel like it might be something else. Plugs don't go bad from sitting I wonder if gunk or something is in there or clogging part of the injector or something. Anyone think that could be a possibility?

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