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Strange fueling issue while coasting

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Old Dec 17, 2009 | 03:00 PM
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cmj
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Strange fueling issue while coasting
I was coasting down a long hill at 65+mph with the clutch in and noticed that the AFRs would not stabilize as the engine idled with the clutch in. The AFRs swing wildly from 11-20 when coasting with the clutch in above about 40mph. This really doesn’t cause any drivability problems but I am curious what is causing it. I don’t recall if it happened before I installed the V7 map or not.

Any ideas?
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Old Dec 17, 2009 | 03:27 PM
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RoadSpike
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Originally Posted by cmj
I was coasting down a long hill at 65+mph with the clutch in and noticed that the AFRs would not stabilize as the engine idled with the clutch in. The AFRs swing wildly from 11-20 when coasting with the clutch in above about 40mph. This really doesn’t cause any drivability problems but I am curious what is causing it. I don’t recall if it happened before I installed the V7 map or not.

Any ideas?
Could possibly just be wind buffeting the intake I noticed big swings with a maf when i went in those corny gas station washes when the blow dryers would hit the hood.
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