Killing the engine while revved up: Ok? - Fuelly Forums

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Old 07-08-2008, 04:31 PM   #1
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Question Killing the engine while revved up: Ok?

When I kill my engine for EOC, it's generally still revving as high as it was in gear, thanks to drive-by-wire rev hang. This could mean 2000 to 3000rpm. Is repeatedly turning off the engine at that speed ok?
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Old 07-08-2008, 05:21 PM   #2
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I shouldn't think it would be really much different to the ECU itself suddenly cutting fuel in DFCO
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Old 07-08-2008, 06:13 PM   #3
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Quote:
Originally Posted by theholycow View Post
When I kill my engine for EOC, it's generally still revving as high as it was in gear, thanks to drive-by-wire rev hang. This could mean 2000 to 3000rpm. Is repeatedly turning off the engine at that speed ok?
Personally I would not do it... I can remember dad yelling at me as a kid when I'd shut off the tractor at high throttle. Dad always said put the throttle on low first before you turn it off. He must have done something right. That little tractor is 53 years old now.

-Jay
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Old 07-08-2008, 06:15 PM   #4
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Possibly with a carbed motor the risk would be flooding it and locking it with gas.
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Old 07-08-2008, 07:12 PM   #5
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Carbed engines will push raw fuel into the exhaust system and when you fire her back up KABOOM!!!!!!!

Ask me how I know LOL, 59 Corvette throttle stuck wide open up to 140 MPH.

Fuel injected, no problem, kill the ignition kill the fuel. Same as high speed DFCO, except you return to idle with ignition on.

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gary
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Old 07-08-2008, 07:26 PM   #6
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Actually you end up with a little extra engine cooling as the water pump is circulating coolent and getting rid of the hot spots in the exhaust areas - I find that my Scion xB engine starts better after I shut it off with a little rev and some open throttle plus it also flushes the exhaust system with some air to remove moisture in the winter time.
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Old 07-09-2008, 06:49 AM   #7
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Old 07-09-2008, 07:33 AM   #8
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I usually let mine settle to idle. It stops much quicker then, with less down-time and more gauge-reading and mileage-counting time. Not sure what difference it makes.

My V-twin lawn tractor mower does that same Kaboom if you shut it down from WOT. Idling for a few seconds first cures it.
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Old 07-09-2008, 08:04 AM   #9
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Quote:
Originally Posted by PaleMelanesian View Post
I usually let mine settle to idle. It stops much quicker then, with less down-time and more gauge-reading and mileage-counting time. Not sure what difference it makes.
My mileage counts even with the ignition off. I intend to add a kill switch eventually.
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Old 07-09-2008, 08:42 AM   #10
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Does it really? That's interesting. Mine stops for as long as the key is back one notch. As soon as I turn it back to the run position (but engine still off), it starts again. It's only a moment, but one I try to minimize.
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