05LSV starts then sputters and dies....

[saskyrider]

ok, so this started happening last week to me. started the boat and went for a little tour with the kids. then after being stopped for a few minutes the boat would start fine then sputter and die. it would crank over for a bit then start... take off and it would get to about 2500rpm then sputter and die. I have replaced fuel line.. checked fuel pump.. which is putting out 9lbs. changed fuel filter as well. tonight I pulled the distributer cap off amd there was corrosion. so I sprayed it with wd40 and let it sit had supper and then used emery cloth to clean the corrosion all away. put it back together and it will start and run but after about 90 seconds it sputters and dies. plugs look ok to me... I'm at a loss here. any suggestions??

thx

geoff

from Muh droid .....

[saskyrider]

FYI it is a carb not fuel injected...

from Muh droid .....

[Badfoot]

This happened to me. I have a 05 LSV. It turned out to be the oil pressure sensing unit. If the engine does not sense oil pressure, the engine will not get up to full speed. It will start but not run at speed.

[Stazi]

This happened to me. I have a 05 LSV. It turned out to be the oil pressure sensing unit. If the engine does not sense oil pressure, the engine will not get up to full speed. It will start but not run at speed.

Seems unlikely as he says the Fuel Pump is running and is getting 9psi (which seems high). I'm thinking you have a stuck float that is not allowing fuel to refill the bowl quick enough, so the 90 seconds it's running is the time it's taking to empty whats in the bowl after it has time to slowly refill. This would suggest why you're seeing the gas pressure on the high end; restriction INTO the carb.
Take the fuel rail of the car and check to make sure it's not blocked and then remove the bowls and check the floats and the vales in there for gum and dirt blocking it up.

[saskyrider]

Thanks Stasi... I will try that. I'm also going to change the spark plugs today as well. boat has 275 hours on it... might as well.

I'm also going to run some SEA FOAM through it today as well.

[Stazi]

Thanks Stasi... I will try that. I'm also going to change the spark plugs today as well. boat has 275 hours on it... might as well.

I'm also going to run some SEA FOAM through it today as well.

If there's any gum in the carbs, the Sea Foam should help....good luck!!

[saskyrider]

well nothing has worked so far... getting frustrated. today I replaced the distributor cap, plugs and put two cams of sea foam in it ( the tank was nearly full) I was only able to run it on the fake a lake tonight but same results. it will start amd run for about 90 seconds... rpm doesn't matter it can be idle or 3000 rpm it will run for a while the start to sputter and die. then with key off you need to out it in neutral and go full throttle then back to neutral... turn the key amd it fires right up and runs another 90 seconds or so. I'm thinking that I need to get it out on the lake and pour the coals to it to get the sea foam through the carb better under load... If that doesn't work its off to the dealership.....

from Muh droid .....

[saskyrider]

after it dies if you don't go full throttle and back with key off before trying to start it up it will just turn over without firing up...

from Muh droid .....

[Stazi]

Yeah, it's definitely a fuel issue. When you crank it it neutral to full throttle, you're using the accelerator pump in the carb to give it a good squirt of gas. That's what it's running on for those 90secs.

The carb is definitely at fault, if in fact you are getting fuel from the pump. Does you fuel rail have a pressure gauge on it and that's how you said it was seeing 9psi, earlier?

Did you remove the fuel rail from the bowls and inspect as I suggested?

[Badfoot]

True, but how long is the fuel pump running? It could be running until the pressure switch takes it out. I would not rule out a faulty oil pressure switch. Check the oil pressure gauge while idling and see what it does when you throttle up and see if it drops. All of the symptoms sound the same as mine did and turned out to be the pressure switch. The pressure switch is not expensive and easy to change.

[Badfoot]

Seems unlikely as he says the Fuel Pump is running and is getting 9psi (which seems high). I'm thinking you have a stuck float that is not allowing fuel to refill the bowl quick enough, so the 90 seconds it's running is the time it's taking to empty whats in the bowl after it has time to slowly refill. This would suggest why you're seeing the gas pressure on the high end; restriction INTO the carb.
Take the fuel rail of the car and check to make sure it's not blocked and then remove the bowls and check the floats and the vales in there for gum and dirt blocking it up.

Forgot to include the original reply from Stasi.

True, but how long is the fuel pump running? It could be running until the pressure switch takes it out. I would not rule out a faulty oil pressure switch. Check the oil pressure gauge while idling and see what it does when you throttle up and see if it drops. All of the symptoms sound the same as mine did and turned out to be the pressure switch. The pressure switch is not expensive and easy to change.

[trayson]

you can certainly disconnect the house that's going to your fuel pump, then put the hose into a 2 gallon gas can with good gas. That will eliminate anything downstream (gas tank issues and the like).

Also don't forget to spray carb cleaner and lube on the outer arms and linkages of the carb. Those can get gummed up.

[trayson]

Oh, and when mine was sputtering and dying on me, I reset the screws on my carb to the default. IIRC, I think that's all the way in and 1.5 turns back out for my Holley

[saskyrider]

Sorry Stazi for not clarifying. My wife's cousin has a fuel pump pressure gauge and we took the line off where it attaches to the fuel rail and then started cranking the engine over (with the garden hose attached of course), thats how we got the 9 psi reading... i did take the fuel rail off completely and blow it out with an airline and there were no obstructions. The little brass filters in between the fuel rail and the carb were replaced as well.

Badfoot -- the oil pressure gauge comes up like normal and actually increases some as i increase the throttle, and since i can have the engine run a 3000 rpm for that 90 seconds it shouldn't be the sensor now? the sensor wouldn't allow the rpm to get that hi if i'm understanding you right? Since the pressure switch is not expensive i have got one coming as well. gonna have a lot of new parts on this engine if this keeps up lol!

[saskyrider]

Yeah, it's definitely a fuel issue. When you crank it it neutral to full throttle, you're using the accelerator pump in the carb to give it a good squirt of gas. That's what it's running on for those 90secs.

The carb is definitely at fault, if in fact you are getting fuel from the pump. Does you fuel rail have a pressure gauge on it and that's how you said it was seeing 9psi, earlier?

Did you remove the fuel rail from the bowls and inspect as I suggested?

If the engine is off when i go neutral to full throttle does it still squirt fuel? Wouldn't the engine need to be running to make that happen.

This just got me thinking... i'm wondering if my vent line from the fuel cap to the tank isn't at fault.... could it be starving for air? and after the engine shuts down it gets air slowly back in and allow it to run again... the fact that the time frame really doesn't change even when it is running at different RPM settings really confuses me. Does this make sense at all?

[parrothd]

The oil guage and switch are totally different things.. Check the oil pressure switch..

Sent from my Nexus 4 using Tapatalk 2

[saskyrider]

The oil guage and switch are totally different things.. Check the oil pressure switch..

Sent from my Nexus 4 using Tapatalk 2

working on it.. I have one coming.. should be here tomorrow

from Muh droid .....

[saskyrider]

True, but how long is the fuel pump running? It could be running until the pressure switch takes it out. I would not rule out a faulty oil pressure switch. Check the oil pressure gauge while idling and see what it does when you throttle up and see if it drops. All of the symptoms sound the same as mine did and turned out to be the pressure switch. The pressure switch is not expensive and easy to change.

where abouts is the pressure switch?

from Muh droid .....

[saskyrider]

SUCCESS!!!!!!! it was the pressure switch. I jumped it to see if that was the cause and it runs like a swiss watch. 90 seconds after pulling the jumper wire off it started to sputter. put the wire back on and sat there with it idling for 20 minutes and drank several beer in celebration!!! thanks for the help gentlemen!!! and we leave on holidays friday morning!! I learned a lot about that engine by all this trial amd error which is great to.

from Muh droid .....

[saskyrider]

badfoot, stasi, parrothd & trayson thanks so much for your replies!!! you easily saved me a 1000 $!!! 2 hour pull to the dealer 135/hour at the dealer and a 2 hour pull home. you guys saved me a lot of pesos!!!

Wahoo!

from Muh droid .....

[trayson]

Congrats. glad it worked out for ya. Finding the problem via forum help is always a great feeling and so much WIN.

[Stazi]

Congrats!
I changed my oil pressure switch last year too. In my case though, I have a permanent fuel pressure gauge on my fuel rail and I could see it was getting no fuel pressure while idling. I ended up replacing the pump before I discovered there was a oil pressure safety switch, and BAM it was faulty. I got a "generic" replacement from my local NAPA and got it back up and running.

Now I have a spare fuel pump.....:roll:

[Badfoot]

Glad it worked out for you.
Stay thirsty my friend.

[saskyrider]

Congrats!
I changed my oil pressure switch last year too. In my case though, I have a permanent fuel pressure gauge on my fuel rail and I could see it was getting no fuel pressure while idling. I ended up replacing the pump before I discovered there was a oil pressure safety switch, and BAM it was faulty. I got a "generic" replacement from my local NAPA and got it back up and running.

Now I have a spare fuel pump.....:roll:

haha ya I have a spare raw water pump plus impeller and will have a spare pressure switch as well. where did you get your fuel pressure gauge for on the rail? I'd like to have one of those!!

from Muh droid .....