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496 ho hesitation on start up

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496 ho hesitation on start up

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Old 05-27-2018 | 08:46 AM
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Default 496 ho hesitation on start up

Just wondering if this is common for a 496 ho to start up like in the video, seems like a little hesitation when it starts up. Here is the YouTube link... https://youtu.be/jtLSHiblkBM
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Old 05-28-2018 | 06:06 AM
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Sounds fine to me. If you have any doubt get the injectors cleaned/services/balanced. How were you feed the engine H2O?
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Old 05-28-2018 | 06:31 AM
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Sounds like my old 496. If I remember correct, something has to prime for a sec then it fires.

Maybe I missed it, you are running water through the impeller right?
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Old 05-28-2018 | 06:50 AM
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I hear nothing wrong in that vid. Sounds the same as mine.
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Old 05-28-2018 | 07:42 AM
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Couldn't see a lot of water coming out the pipes, I assume you had the hose connected to an engine flush? When I flush mine on the muffs, I get a lot more water through the exhaust, make sure your water pressure isn't starving the cooling system.

I couldn't hear anything wrong. Is it a hesitation between turning the key and the starter motor turning or is it cranking a while before she fires?

RR





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Old 05-28-2018 | 07:43 AM
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Originally Posted by CJSYD
I hear nothing wrong in that vid. Sounds the same as mine.
Same here. Normal. Pack cooler. Go boating!
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Old 05-28-2018 | 09:22 AM
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Yeah i have the garden hose hook up to the intake side on the raw water pump, it has decent flow just doesn't look like it in the video. Well it just seems like it fires then there is a little hesitation for a split second and then finishes it's ramp up...this is my first big block so was just curious. Have yet to water test it. Still warming up here in Canada....
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Old 05-28-2018 | 09:45 AM
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Okay, I think I understand better now....
When she fires, the engine barks to life as though you've got the throttle open but then immediately seems to drop back below idle like it's going to stall then comes back up and stabilizes at normal idle speed. It only takes a second or two, If that's it then she's perfectly normal. Sounds more severe out of the water, exhaust noise isn't trapped under the platform like when it's in the water. Just enjoy the noise!

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Old 05-28-2018 | 10:24 AM
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Where's BUP?
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Old 05-28-2018 | 10:25 AM
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the link is posted but not accessible for me here.

A clean flame arrestor and clean IAC muffler and all its passages always help with idle control along with the IAC.
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