2.3L Cobra stall

[Joecef]

Hey guys,
I am brand new to this forum, thought id reach out and see if anyone could help me. I recently purchased as 1950 blue fin with a 2.3L Cobra. The boat starts fine every time, well almost. So whats happening is after it runs for about 15-20 min it starts to chug or misfire. If I play around with the throttle when its doing it I can stop it from stalling right away but it will eventually stall. Once its stalled I try and start it back up it'll run for about 5 seconds and shut off again. if I let it sit for 10-15 min she starts right back up and runs. I've done a compression test and all cylinders are within 10% of one another (147-154 psi). my temp gauge doesn't get over 170. I have felt the ignitor when she stalls and it was warm not really that hot. I have replace cap and rotor and plugs and wires. I have tried to see what other people have done but can't find to much out.. Id like to to the newer electric ignition which will be done this week. Just wondering if anyone has any ideas or suggestions. I am almost pulling my hair out

 

[Scott Danforth]

few things.

verify your temp gauge. 170 is a bit warm

go thru your carb. you have a carb issue.

 

[Joecef]

few things.

verify your temp gauge. 170 is a bit warm

go thru your carb. you have a carb issue.

Okay, I will go through that tonight. I am new to the carb world....haha, why would the carb start acting up after running for a bit and then after sitting run like nothing happened? I am just trying to understand it. Thanks for your help in advance

 

[Scott Danforth]

the crud in your fuel tank is probably in the carb now. a bit of crud most likely is plugging the idle circuit

also check to make sure the clear line from the fuel pump to the spark arrestor does not have fuel in it. if it does, the motor will run like crap. that is the tell tale for a failed fuel pump.

 

[Joecef]

the crud in your fuel tank is probably in the carb now. a bit of crud most likely is plugging the idle circuit

also check to make sure the clear line from the fuel pump to the spark arrestor does not have fuel in it. if it does, the motor will run like crap. that is the tell tale for a failed fuel pump.

awesome ill check that tonight. ill report back here. Thankyou

 

[Joecef]

Okay so little update. I just my fuel pump, no gunk was inside. I check the clear line, noticed some kinks, so I replaced it also no fuel inside that line. I started the boat and let it run in the driveway. it idled for about 20 min before I started hearing some ticking coming from the dist. I then noticed once that happened it started having a rough idle I touched the igniter it was hot, I could rest my hand on it for about 5 sec or so. so the ticking got louder and then the boat just shut off. Now im assuming I should replace my entire ignition system, cap rotor dist and ignitor. any brand I should go to? I was told to run a newer electric ignition from pertronix flame thrower II also heard something about by passing and no inline resistors needed... Any help would be greatly appreciated

Thanks Joe

 

[Scott Danforth]

if it is the aftermarket igniter, I would put points back in the dizzy

 

[Joecef]

if it is the aftermarket igniter, I would put points back in the dizzy

No its all stock ignition in it now. I noticed when I pulled off the cap the points have some carbon on them, one of them has ben in contact..... So I believe the dist is done

 

[Scott Danforth]

i would search fleabay for another dizzy then.

 

[Joecef]

So what should my dwell be at? I’m at 39 degrees. I noticed today that I ran my boat with the gas cap off and it ran a lot longer before acting up. My vent hose vents through the back of the boat with nothing on it. Shouldn’t there be a one way valve on it?

 

[Lightwin 3]

No one way valve.

Does the vent line have any bows or kinks in it. If it has a bow (low spot) fuel can sit in there and cause a restriction.

After it stalls, is the carb dry? Can you see fuel squirting when you work the throttle?

 

[Joecef]

No one way valve.

Does the vent line have any bows or kinks in it. If it has a bow (low spot) fuel can sit in there and cause a restriction.

After it stalls, is the carb dry? Can you see fuel squirting when you work the throttle?

Sorry for the delay, no restrictions or kinks in the line. the carb is damp so its still getting fuel. I replaced the coil last weekend
but ive been way to busy to put it in the lake. I did run it in my driveway for 20-25 min and it seemed to run way better. I am hoping to put it in the water this week and see how the out come is

 

[Joecef]

Okay so a little update. Took her out for a ride yesterday, and she ran good. shut it off to fish, went to turn it back on and it just cranked. I could smell fuel, so thought maybe I flooded it. I let it sit for 5 min and went back, she fired right up. I put it into drive and it stalled right away. I turned it over again and it fired up and soon as I put it into gear it stalled. so I left it for a bit, tried it after 10-15 she fired up and got into gear and limped it home. I did notice tho anything over half throttle at this point it was bogging out like it had no power, and want to die. if I backed it off a little to say 1/4 throttle it smoothed out and ran okay.......any suggestions before I cave and bring it into a shop??
I didn't have anyone with me to see well cranking if there was fuel, I just assumed it was getting fuel because I could smell it

 

[huggyb1972]

I have the same boat and motor mine is a 1990. When you say the carb is damp like where? It shouldn't have anything outside of it. Did you change your fuel filter yet? being a aluminum hull that thing will pull moisture like no other. Are you still running points? I had not found a source for a pertronix unit for the 2.3 yet, but then again engine troubles aren't my trouble.

 

[Joecef]

I have the same boat and motor mine is a 1990. When you say the carb is damp like where? It shouldn't have anything outside of it. Did you change your fuel filter yet? being a aluminum hull that thing will pull moisture like no other. Are you still running points? I had not found a source for a pertronix unit for the 2.3 yet, but then again engine troubles aren't my trouble.

Ya on the outside of the carb its damp. I do have a brand new water separator on it. I changed the plugs again yesterday. I did notice last time it stalled, it was at a higher rpm it kept bogging down almost like its out of fuel. So i am going to go over the fuel pump again. if i find a fuel pump issue i may sway it out to electric fuel pump.

As far as electronics i am still running a points system. I replaced the coil, cap and rotor. spark is not my issue. This is starting to become mind blowing ha. I am going to attempt a fuel test, and see if i can see whats going on in the fuel system. if i can not pin point the issue i am going to put my head down and drop it off at the marina

 

[Wkd179]

How was gear oil filled? Its critical to fill drive from the middle screw hole

 

[Wkd179]

sorry I posted in the wrong forum