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Mercruiser 57 L Low RPM

J

John McCall

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"I have a 1990 Regal Commodore

"I have a 1990 Regal Commodore with twin 5.7 L Mercruiser engines. My port engine won't produce more than 3200 RPM's.I changed plugs, wires, rotor,fuel filter. It runs fine but won't get above 3200. Carb rebuild next?"
 
"Run it hard, shut it down imm

"Run it hard, shut it down immediately (with NO idling period), let it cool down then pull and examine at least two plugs. The color will clue you in on where to start looking.

Jeff"
 
Ran accross this two years ago

Ran accross this two years ago. Did everything you did at tuneup time plus carb rebuild and changed the fuel pump. Turned out a wire fell off a plug. Never backfired just never reached WOT. Also check your prop on that side for pitch damage.
 
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