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Old 08-18-2007, 11:18 AM   #1
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Question on fuel cutoff during coast

On a warmed-up engine, if the ECU goes open-loop during no-accelerator coasting above a given RPM, does that imply fuel cutoff?

I didn't believe my VW Cabrio implemented fuel cutoff, but I've been watching loop status lately and now I'm thinking I was mistaken. It seems to go open-loop any time the accelerator isn't depressed and the engine is spinning faster than about 1400RPM. (Interestingly, this happens whether the A/T is in drive or neutral.)

Just wondering if that's a sure sign fuel cutoff is happening. If so, I need to tweak my driving style slightly.

Thanks,
Rick
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Old 08-18-2007, 11:53 AM   #2
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It's likely fuel cut-off. skewbe noticed the same thing with his Metro:

http://www.gassavers.org/showthread....loop#post40207
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Old 08-18-2007, 01:07 PM   #3
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Just about any EFI car has a fuel cutoff above a certain rpm in gear w/ no throttle.
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Old 08-20-2007, 08:19 PM   #4
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My car shows open loop under the same conditions you just described. You can also feel the car go out of fuel-cutoff into normal mode if you leave it in gear and let yourself coast down to below the RPM range. I feel a little shudder (and a reduction in deceleration) at the same time the Scanguage starts showing open loop, so I believe that is what it displays in my car.
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