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Old 05-27-2023, 05:55 PM   #1
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Default Throttle creep

When i throttle up to a cruising speed rpm within 5 to 10 seconds the rpm will slowly increase 400 to 800 rpm’s. I have replaced the fuel pump, carburetor, shifter and all the cables, plugs and spark plug wires, distributer cap and it still has the rpm creep. I was wondering if anyone else has had this issue?
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Old 05-28-2023, 01:50 AM   #2
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Originally Posted by aguydenon View Post
When i throttle up to a cruising speed rpm within 5 to 10 seconds the rpm will slowly increase 400 to 800 rpm’s. I have replaced the fuel pump, carburetor, shifter and all the cables, plugs and spark plug wires, distributer cap and it still has the rpm creep. I was wondering if anyone else has had this issue?
Some details on what engine you have and if it carbureted or fuel injected.
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Old 05-28-2023, 04:08 PM   #3
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Some details on what engine you have and if it carbureted or fuel injected.
I have the mercruiser 5.7 alpha one gen 2
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Old 05-28-2023, 05:44 PM   #4
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You may have an issue with the Tach as they are problematic in the marine environment. Also could be movement in the throttle cable, sometime there is a small amount of pressure on the cable and it ends up slipping causing a change in throttle setting.
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Old 05-29-2023, 04:51 AM   #5
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Is it possible that the slight increase in rpm is from the hull trim changing slightly as the speed increases and hull attitude settles in to a stable plane
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Old 05-30-2023, 06:35 PM   #6
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Is it possible that the slight increase in rpm is from the hull trim changing slightly as the speed increases and hull attitude settles in to a stable plane
Agreed, let's talk actual RPM's here.

Does it increase beyond the initial increase?

If you reduce RPM's does it keep repeatedly creeping up?

Once up on plane and outdrive is trimmed out and trim tabs are tuned, I'd expect a small spike in rpm.
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