Engine starts but wont go into "neutral" position. HELP!

bs4690

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Nov 2, 2011
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I have a 1986 mercruiser I/O and recently had troubles stalling. A mechanic looked at it and tried to tell me i needed a new carb. I bought a rebuild kit for $70 compared to $800 for a new carb, rebuilt the carb and she starts up great.

She idles fine when i have the throttle control at the lowest position but when i try to pull the throttle to the "neutral" position (where it is straight up and down) the engine dies every time. Without being able to do this I obviously can't put into forward or reverse! I'm figuring I must have screwed something up when re-installing the throttle linkage at the carb. Any suggestions would be greatly appreciated because I cant seem to find where I've done wrong!
 

Don S

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Re: Engine starts but wont go into "neutral" position. HELP!

Assuming you are setting on a trailer and on muffs, disconnect the shift interrupt switch on the engine and see if it will work. Don't do this in the water.

What engine and assuming an Alpha drive.
 

bs4690

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Re: Engine starts but wont go into "neutral" position. HELP!

Thanks for the quick reply!

I checked the shift interrupt and it was working fine.

Fortunately I did figure out the problem...I ended up taking the throttle cable off from the control arm behind the carb and it idled fine when the control throttle(the one next to the steering wheel) was in it's vertical position. Thankfully it ruled out any electrical problems I thought I may have had. Some quick tinkering made me realize the idle screw on the throttle linkage had backed out a tad. Turned it in a turn or two and everything's working great.

Only problem now is I'm unsure of what the exact idle rpm should be set to? My crappy seloc manual doesn't specify. Its a 1986 mercruiser 3.0 140 hp, alpha one outdrive.
 

haulnazz15

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Re: Engine starts but wont go into "neutral" position. HELP!

$800 for a new carb? Not hardly. About half that at most.
 

Bondo

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Re: Engine starts but wont go into "neutral" position. HELP!

Only problem now is I'm unsure of what the exact idle rpm should be set to? My crappy seloc manual doesn't specify. Its a 1986 mercruiser 3.0 140 hp, alpha one outdrive.

Ayuh,.... 650/ 750 rpms, idle, in gear, in the water... 'bout 750 rpms on the wagon, muffed up...
 
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