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Old 05-11-2021, 12:26 PM   #1
wabisabi
Scooby Newbie
 
Member#: 470586
Join Date: Jul 2017
Chapter/Region: South East
Location: Florida
Vehicle:
2004 Impreza WRX
World Rally Blue

Default AFR lean spikes on cold idle when put into neutral?

I’ve been having a weird issue lately where when I put the car into neutral from any gear while still relatively cold, my AFR’s will drop to ~11 then spike to 17-18 then fall at stoich. I have a new MAF sensor on the way (my stocker has 180k) as well as an IACV gasket with the intent of removing it to clean.

Also not sure if related, but on decel when my RPM’s reach around 1800 or whenever injectors kick back in to maintain idle, my AFR will also be around 17-18.

I’d appreciate any insight, thanks!
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Old 06-01-2021, 02:42 PM   #2
wabisabi
Scooby Newbie
 
Member#: 470586
Join Date: Jul 2017
Chapter/Region: South East
Location: Florida
Vehicle:
2004 Impreza WRX
World Rally Blue

Default

Well I ended up throwing the stock air box back on, new denso maf, and cleaned the IACV. Car still leans up to around 16 but nothing crazy, maybe I’m just paranoid. Ratios are normal under any other condition.
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