Thread: Odd AFR issue
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gogomobil gogomobil is offline
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Join Date: Apr 2008
Posts: 138
Originally Posted by equality72521 View Post
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?
Sounds like a bad fuel accumulator, pelican 911-110-197-02-M14
91 C2 Turbo, K27 7006, headers, Greddy EBC, 1bar
Old 04-08-2010, 01:29 AM
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