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#572779 - 09/11/19 06:35 PM Re: Help - Acceleration Issues [Re: athiker]  
Joined: Sep 2019
Posts: 3
flemiis Offline
Warrant Officer
flemiis  Offline
Warrant Officer

Joined: Sep 2019
Posts: 3
fratees
You could check the pressure at the fuel rail to see if it is within spec. Did this come on suddenly or gradually? If gradually, I'd go for a heavy dose of injector cleaner with a small amount of fuel. If suddenly, I'd check the fuel pressure at the fuel rail. There should be a schrader valve somewhere

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#572780 - 09/12/19 12:53 PM Re: Help - Acceleration Issues [Re: athiker]  
Joined: Dec 2003
Posts: 3,902
athiker Offline
Admiral
athiker  Offline
Admiral

Joined: Dec 2003
Posts: 3,902
Lake Norman, NC
Thanks again for all the replies, and I'm sure they will help with future issues when they come. So I went down to the boat about 2 weeks ago and spent a good while trying to get the large rubber hoses off of the risers to check the exhaust flappers. There was no way to get them off w/o unbolting and removing the actual metal risers, which would require redoing the gaskets, etc. I was still dealing w/ post-op knee issues so could not spend all day in the engine well. I could not find a valve to check the fuel pressure, so it looked like that was going to require cutting in the fuel line. I did check the fuel spray cone with the flame arrestor off and it looked complete and strong.

So fast forward I caved and called a mechanic, who of course was backed up 2 weeks.

He just called and the said the boat is running great....and the culprit was....this is very embarrassing....spark plugs. He also cleaned the distributor cap but said it looked pretty good. That had been recently changed when I replaced the ignition sensor assembly back in 2017.

I had bought new plugs and wires a couple years back and asked a different mechanic to install them as part of another service call and he did the wires but told me I had the wrong plugs. I never got around to changing the plugs partly b/c the boat was running fine at the time. Guess it caught up to me. frown Lesson learned, check the plugs and distributor cap first before diving in too deep....the basics.

I guess it threw me b/c it seemed to run fine at idle and cruising speed, and was more of an acceleration issue at first so I thought fuel delivery. The very last time I took it out though it was feeling a little rough at cruising speed, so much so that I got worried and turned around.

Again, thanks for the input and just wanted to conclude with the apparent fix....will know for sure when I take it out this evening or this weekend.


2000 Cobalt 206 5.7L EFI Alpha 1
#572786 - 09/14/19 04:29 PM Re: Help - Acceleration Issues [Re: athiker]  
Joined: Jan 2003
Posts: 3,964
Jack T Offline
Admiral
Jack T  Offline
Admiral

Joined: Jan 2003
Posts: 3,964
Southern California
"Lesson learned, check the plugs and distributor cap first before diving in too deep....the basics."

First rule of troubleshooting--get the easy things first.


Have a great day of boating
2012 Monterey 224 FS,
300 HP Volvo Penta with catalytic converters

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