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500 efi blue racing running bad!!!


500 efi blue racing running bad!!!

Old 11-21-2018, 06:35 PM
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Default 500 efi blue racing running bad!!!

hey guys I have a 27’ Fountain with a 500 efi with very rough idle & sometimes acts like she wants to die, have to bump throttle a little & she idles fine, hesitates, coming out the hole & once I get her on plane I try & give her more throttle, she hesitates, sputters, just not accelerating like she should!
PLEASE HELP!!! I’ve had computer scanned no codes, changed IAC valve, changed plugs, fuel filter!

Last edited by Jh06231987; 11-21-2018 at 06:40 PM.
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Old 11-21-2018, 06:45 PM
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First place if no codes would be fuel pressure, pull the vacuum line off the fuel pressure regulator to see if there is any gas in it. If there is your fuel pressure regulator is shot.
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Old 11-21-2018, 08:53 PM
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MULTECS do not have to say anymore.

And fuel pressure

Your source for 2018 injectors instead of 1989 MULTECS

When I went to Bosch in person THEY COULD NOT BELIEVE THAT ANYONE is still using them in current times. Just saying
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