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Old 07-08-2024, 02:26 PM   #1
Join Date: Aug 2021
Posts: 6
Default Fast Idle

I have a 1996 Maxum 1900 SR with 4.3LX mercruiser alpha one.

Had an issue this past weekend with a fast idle, around 1400 RPM. This occurred near the end of a day of waterskiing. Running fine before that.

I let it sit for a hour or so and then took the boat out for a slow tour of the lake and again had a fast idle and faster than normal speed with low throttle.

Seemed to run fine next day when I took the boat to the ramp to take out of the water.

Any thoughts on what may be the cause of the fast idle?

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Old 07-08-2024, 04:27 PM   #2
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Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,419

sticking throttle cable or sticking throttle plates on the carburetor. A vacuum leak under the carburetor can also cause this but typically is associated with a poor idle.
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

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