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Whippled 509 quits over 1000 rpm

Old 08-01-2020, 10:59 AM
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Default Whippled 509 quits over 1000 rpm

Twin whippled 509s. Port motor starts, idles and shifts fine but once you push throttle over 1000 rpm it coughs, sputters and dies instantly or sometimes it may lose rpm down to 3-400, catch itself and slowly come back up to idle. They have new cap, new rotors, swapped fuel pumps, swapped coils and swapped ECMs. They have thrown no trouble codes other than low voltage on the throttle body sensor. Also had the fuel tank drained and cleaned. All fuel filters are clean or new. Any ideas?
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Old 08-01-2020, 11:35 AM
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I would start by checking fuel pressure
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Old 08-01-2020, 11:42 AM
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you can pull the IAC and cycle the key on and off to see if its functioning normal..........I had one do similar issues engine would die when put in gear under load, swap the IAC's see if it follows...........what blowers are these 3.3 ?
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Old 08-01-2020, 11:57 AM
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Fuel pressure 45-50

2.3 whipples
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Old 08-01-2020, 12:00 PM
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Originally Posted by bigboat28 View Post
Fuel pressure 45-50

2.3 whipples
seems high, is that what whipple calls for ? to much fuel pressure injectors wont fire correctly

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Old 08-01-2020, 12:04 PM
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Think so or so I was told
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Old 08-01-2020, 09:08 PM
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Originally Posted by F-2 Speedy View Post
seems high, is that what whipple calls for ? to much fuel pressure injectors wont fire correctly
they'll fire just fine up to 70psi,i tested mine up to 100psi,had to tap start them to fire,but once going,they did fine.I was just testing them to make sure they were fine.
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Old 08-01-2020, 09:12 PM
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Originally Posted by bigboat28 View Post
Twin whippled 509s. Port motor starts, idles and shifts fine but once you push throttle over 1000 rpm it coughs, sputters and dies instantly or sometimes it may lose rpm down to 3-400, catch itself and slowly come back up to idle. They have new cap, new rotors, swapped fuel pumps, swapped coils and swapped ECMs. They have thrown no trouble codes other than low voltage on the throttle body sensor. Also had the fuel tank drained and cleaned. All fuel filters are clean or new. Any ideas?
are you talking about the throttle position sensor,,if voltage is low,need to find out what connection is bad.
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Old 08-01-2020, 09:16 PM
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Yes throttle position sensor
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Old 08-01-2020, 09:39 PM
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Originally Posted by bigboat28 View Post
Yes throttle position sensor
I'd say you have a bad sensor or a sensor ground was missed.
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