sudden loss of power

panteramatt · 11-06-2015, 04:41 PM

So i just got back for a ride in the mountains. The throttle got stuck wide open so i had to slow it down with the brakes and kill the power. About a minute late loose power amd she limped home. Remove air filter amd theres a lot of oil residue butit smells like gas. Good thw plugs just be fouled? I cant pull them right now as i dont have any tools. It doesnt smoke at all.

sho305 · 11-06-2015, 07:07 PM

Could be a valvetrain problem if rpm went way high, but if its not knocking a rod you should be happy. I don't know about your vanny (or what parts are in it) but in my experience pushrods and springs like to fail at high rpm sometimes valves. In that case you would lose a cylinder and that is half your motor.

panteramatt · 11-06-2015, 10:17 PM

Rpm never went high as i was climbing the mountain. The motor starts right up with no smoke just has no balls. With the motor running i can see a mist coming from the crankcase vent.

nobuckbuild · 11-06-2015, 11:46 PM

you blew a head gasket i bet

1989Marathon · 11-07-2015, 11:10 AM

Quote:

Originally Posted by nobuckbuild

you blew a head gasket i bet

I agree. Between the cylinder and the oil return hole. A compression check will tell you which one.

panteramatt · 11-07-2015, 01:39 PM

Ok. It runs like the chokes on but it aint. Oil level is fine amd it dont smoke at all. Sputters off idle and jist hardly moves. Is that a sign of a head gasket?

sho305 · 11-07-2015, 04:25 PM

That would be blow by, either its a head gasket leaking into the oil return or you lost your rings which would be really strange and it would smoke when you gassed it.

Courageous Carts · 11-13-2015, 10:01 PM

It's also a sign on a bent push rod.

fstg21 · 11-13-2015, 10:41 PM

You probably bent a rod and are running on 1 cylinder.

Easy diagnosis, pull each plug wire while its running. If the tone doesn't change when you pull 1 vs the other, there's your dead hole.

panteramatt · 11-14-2015, 01:27 PM

Ok checked the compression. one cylinder was 120-125 psi and other one was 60. Removed the valve cover and the set screw for the intake rocker arm was laying in there and the rod was too. Its not bent. Wonder how this could have happened? Forget what to set the lash at .006 or .008? Hopefully I can get it in and set with the motor in there.

11-06-2015, 04:41 PM	#1
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	sudden loss of power So i just got back for a ride in the mountains. The throttle got stuck wide open so i had to slow it down with the brakes and kill the power. About a minute late loose power amd she limped home. Remove air filter amd theres a lot of oil residue butit smells like gas. Good thw plugs just be fouled? I cant pull them right now as i dont have any tools. It doesnt smoke at all.

11-06-2015, 07:07 PM	#2
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: sudden loss of power Could be a valvetrain problem if rpm went way high, but if its not knocking a rod you should be happy. I don't know about your vanny (or what parts are in it) but in my experience pushrods and springs like to fail at high rpm sometimes valves. In that case you would lose a cylinder and that is half your motor.

11-06-2015, 10:17 PM	#3
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: sudden loss of power Rpm never went high as i was climbing the mountain. The motor starts right up with no smoke just has no balls. With the motor running i can see a mist coming from the crankcase vent.

11-06-2015, 11:46 PM	#4
nobuckbuild Gone Wild Join Date: Mar 2012 Location: CENTRAL PENNSYLVANIA Posts: 1,466	Re: sudden loss of power you blew a head gasket i bet

11-07-2015, 01:39 PM	#6
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: sudden loss of power Ok. It runs like the chokes on but it aint. Oil level is fine amd it dont smoke at all. Sputters off idle and jist hardly moves. Is that a sign of a head gasket?

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11-07-2015, 04:25 PM	#7
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,443	Re: sudden loss of power That would be blow by, either its a head gasket leaking into the oil return or you lost your rings which would be really strange and it would smoke when you gassed it.

11-13-2015, 10:01 PM	#8
Courageous Carts Not Yet Wild Join Date: Nov 2015 Location: Georgia Posts: 10	Re: sudden loss of power It's also a sign on a bent push rod.

11-13-2015, 10:41 PM	#9
fstg21 Gone Wild Join Date: Sep 2011 Location: ARIZONA Posts: 476	Re: sudden loss of power You probably bent a rod and are running on 1 cylinder. Easy diagnosis, pull each plug wire while its running. If the tone doesn't change when you pull 1 vs the other, there's your dead hole.

11-14-2015, 01:27 PM	#10
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: sudden loss of power Ok checked the compression. one cylinder was 120-125 psi and other one was 60. Removed the valve cover and the set screw for the intake rocker arm was laying in there and the rod was too. Its not bent. Wonder how this could have happened? Forget what to set the lash at .006 or .008? Hopefully I can get it in and set with the motor in there.

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