4 hours and 4 plugs R shot

[lodough780]

After rebuilding my Mercarb and doing a complete tuneup my 1988 3.0 mercruiser. It has started fouling out my spark plugs after 4 hours of running. The plugs are solid black so I know that it is running rich, I also used 3/4 tank of gas during my 4 hour venture. Anybody know whats going on with this thing?

 

[4winnsskipper]

Re: 4 hours and 4 plugs R shot

i think you answered your own question, your running way to rich...........lean it out to the appropriate settings, change plugs or burn them if your a cheap-o

 

[Coors]

Re: 4 hours and 4 plugs R shot

What is your fuel pressure? And that rich is not a screw adjustment.

 

[Silvertip]

Re: 4 hours and 4 plugs R shot

You screwed something up in the carb. Here are things to check: 1) float level, 2) inlet needle and seat function, 3) check ball fell out and was not replaced (some have it some don't) 4) choke misadjusted (high probability) and 5) Choke pull off not functional, not connected, or misadjusted. NEVER attempt to adjust the choke or any of its related linkage on a warm engine.

 

[lodough780]

Re: 4 hours and 4 plugs R shot

I have pulled the carb 2x's and have reset the float level. I have put the float in gas for several days to see if it was cracked and filling with fuel, it was ok. I have reset the choke while cold at a setting of 2mm like the rebuild kit says. I've noticed while running that the choke never fully opens even At full throttle. This engine has always used alot more gas than I think that it should. I guess Il break it down again and see if I find something that I missed. Thanks

 

[Boomyal]

Re: 4 hours and 4 plugs R shot

,,,,I've noticed while running that the choke never fully opens even At full throttle. This engine has always used alot more gas than I think that it should.

Hmmmm, methinks you've stumbled on to something here. Before you tear into it again, I would dial the choke all the way off and go run it. If your plugs don't foul and the engine runs better, you can deal with the choke without tearing it all apart again.

 

[Silvertip]

Re: 4 hours and 4 plugs R shot

By golly -- if the choke never opens up fully you have only one cause. the choke stove is not working.

 

[Boomyal]

Re: 4 hours and 4 plugs R shot

By golly -- if the choke never opens up fully you have only one cause. the choke stove is not working.

Hmmmm? A new term for me. I've heard of coke stove but never 'choke stove'.!

 

[Coors]

Re: 4 hours and 4 plugs R shot

Boom, are you a youngin? choke stove is the tube from the intake manifold

 

[Silvertip]

Re: 4 hours and 4 plugs R shot

Or if this carb has an electric choke, that choke stove ain't workin'. Either way, the choke needs heat to open fully. No heat -- the stove ain't workin'
Danged kids!!

 

[Boomyal]

Re: 4 hours and 4 plugs R shot

Boom, are you a youngin? choke stove is the tube from the intake manifold

I'd call that a 'choke flue' Coors, not a 'choke stove'.

 

[Reel Poor]

Re: 4 hours and 4 plugs R shot

I'd call that a 'choke flue' Coors, not a 'choke stove'.

"Choke Flue", that sounds like something you need antibiotics for.

 

[lodough780]

Re: 4 hours and 4 plugs R shot

Ha ha ha! Stop it you guys are friggn killn me! I'll drop a new set of plugs and reset the electric "choke stove" again. Thanks for the replies and pray for rain our lake is 8.5 feet below summer pool!

 

[Bondo]

Re: 4 hours and 4 plugs R shot

Ayuh,.........

I Think the Choke Stove is that little cavity in the manifold that the Choke Flue comes Out of........

Other times the Spring sits in the Choke Stove,+ a rod controls the Choke.......
It's a Much Healthier set up,............ No Flu...............



Btw,........ I Think your Carb Problems are Much Deeper than a Stuck Choke.........

 

[lodough780]

Re: 4 hours and 4 plugs R shot

Finally over the choke flu but still having one plug foul out and boat sputters at 3/4 throttle unless you feather throttle or adjust trim. Its still using more gas than I think it should(it always has). What is the average price of letting a shop rebuild my carb?