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Posting a reply to: Re: Merc 175 EFI 1997 idle problems

Muskie Fishing -> Muskie Boats and Motors

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Macintosh

Posted 5/3/2016 10:35 AM (#815916 - in reply to #815814)
Subject: Re: Merc 175 EFI 1997 idle problems

Posts: 117

or old fuel lines gummed up from ethanol fuel. This is exactly how my engine acted from old fuel lines. It's a cheap fix and can't hurt, might be worth replacing the fuel system from the tank right up into the engine anyway. Mine would start hard, stutter and idle rough, occasionally stall, it would sometimes hesitate on dropping the throttle, then would go fine and start OK. We cut open the fuel lines and found them full of varnish. Replaced with ethanol-resistant hosing and bulb and new filters, including in the engine, for something like $140 including parts and labor, and she ran smooth after that.