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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


 
 
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Old 08-24-2019, 10:45 PM   #1
RickyBobbyS13
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Join Date: Mar 2011
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RB20DET Running extremely lean on idle.

Hey everyone. So to start, my RB20DET ran fine in my other chassis, when i swapped it to my new chassis and switched to a front mount the car runs extremely lean on idle. AEM Wideband is reading 16-17 and then so lean it wont even give me a reading. I havent found any leaks in my couplers or IC piping and cant seem to narrow down if there is a vac leak. I replaced the plugs/coil packs already but cant figure out what my issue is. Stock RB20 with an RB25NEO turbo and ISR downpipe/exhaust.

Any ideas on what else to trouble shoot? Fuel pump finally shit the bed maybe?
Thanks.
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