Thread: Odd AFR issue
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equality72521 equality72521 is offline
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Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,840
Odd AFR issue

Scenario: On a cold engine I'm rich with low RPMs (AAR, the one with the electrical plug, removed) and as it warms up it leans out and idle increases, normal behavior. At normal operating temps AFR is around ~14.5 and idle is 1000 RPM. Now, if I park the car for a while (30-90 minutes or so) and restart before it cools completely my idle drops to ~800 and my AFR leans out to ~16-16.5 and it doesn't run so well. It stutters and pops for a little bit and after ~5 minutes or so the AFR at idle drops back to ~14.5 and idle is back up to 1000RPM. Now it makes sense that the idle would drop as the engine is cooling but why would my AFR go lean rather than rich as is normal when the engine temp is dropping? I've checked system pressure, cold control pressure, and hot control pressure and they are all dead on factory specs. What could cause this?
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Old 04-06-2010, 06:21 AM
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