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Christopher PerezJul 25, 2025
Why is the acceleration of my MerCruiser 305 CID (5.0L) Engine poor?
- SSusan HutchinsonJul 25, 2025
If your MerCruiser Engine's acceleration is poor, several factors could be the culprit. Begin by adjusting the idle mixture screws and checking/correcting the ignition timing. Inspect the intake manifold or carburetor base for any vacuum leaks. Replace any fouled, burned, or cracked spark plugs, ensuring they match the correct heat range. Also, check for a stream of raw fuel from the accelerator pump discharge nozzle when opening the throttle with the engine shut off. Replace a dirty or cracked distributor cap or rotor, and clean the carburetor if it's dirty. Low compression may also be a factor.
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