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Discussion Starter · #1 ·
I installed the AEM in my car and my car takes alot longer to warm up now than when it was on stock ECU. It takes about 10-15 mins to get to 140F. My car starts at 10AFR then slowly ends up at 13.5AFR when at 139F. Once the coolant temp hits 140, that's when my O2 FB comes on and it starts to idle at 14.6 AFR

Those with a Wideband and on stock ECU, can you give me a range the stock ECU sets the AFR to when you're cold starting the motor with the coolant temp around 65F to when it starts O2 FB?

Would be much appreciative.
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