292 help
Lead Gopher
Joined: Aug 2012
Posts: 10,066
Likes: 1,616
From: Seattle
Ray is correct here. When looking down the throat and giving it a manual throttle increase you should just see a shot of gas added to the venturi and not a continuous stream that doesn't stop.
Often as the engine is accelerated it takes more voltage to deliver a spark to the plugs and a condenser that is partly shorted (resistors and transistors typically open on failure, condensers/capacitors typically short internally) can cause a pretty good stumble or nearly die as the spark from the points isn't fully delivered to the downstream components but is sent to ground through the shorted condenser.
If you eliminate fuel delivery as being a culprit keep the innocent looking condenser in mind. It's been the cause in at least 6 cases I know of this year.
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Thread Starter
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Senior User
Joined: Oct 2014
Posts: 313
Likes: 1
Ray is correct here. When looking down the throat and giving it a manual throttle increase you should just see a shot of gas added to the venturi and not a continuous stream that doesn't stop.
Often as the engine is accelerated it takes more voltage to deliver a spark to the plugs and a condenser that is partly shorted (resistors and transistors typically open on failure, condensers/capacitors typically short internally) can cause a pretty good stumble or nearly die as the spark from the points isn't fully delivered to the downstream components but is sent to ground through the shorted condenser.
If you eliminate fuel delivery as being a culprit keep the innocent looking condenser in mind. It's been the cause in at least 6 cases I know of this year.
.
Often as the engine is accelerated it takes more voltage to deliver a spark to the plugs and a condenser that is partly shorted (resistors and transistors typically open on failure, condensers/capacitors typically short internally) can cause a pretty good stumble or nearly die as the spark from the points isn't fully delivered to the downstream components but is sent to ground through the shorted condenser.
If you eliminate fuel delivery as being a culprit keep the innocent looking condenser in mind. It's been the cause in at least 6 cases I know of this year.
.
Fleet Mechanic
Joined: Jan 2014
Posts: 1,558
Likes: 295
From: Billings Montana
As I said with motor not running look down the throat of the carb and open the throttle. Open it all the way. You should get a shot of gas almost the entire stroke of the throttle. If you get a shot just off where idle would be and then nothing that is not right. Since this happened all of a sudden and has not been an issue for a long period of time. I am still saying bad diaphram on accelerator pump. Not a kinked fuel line because that would cause problems at higher speeds and hard acceleration because the flow may not be able to keep the bowl full. Check the diaphragm. You can buy just the diaphragm at a good parts store
Fleet Mechanic
Joined: Oct 2007
Posts: 1,981
Likes: 106
My 292 seems like it is down on power, but since this is my first one and it is a low compression engine with that funky crossover exhaust, Im not sure how it should perform.
I do not that not having a fuel filter at all cant be helping.
I do not that not having a fuel filter at all cant be helping.
Thread Starter
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Senior User
Joined: Oct 2014
Posts: 313
Likes: 1
As I said with motor not running look down the throat of the carb and open the throttle. Open it all the way. You should get a shot of gas almost the entire stroke of the throttle. If you get a shot just off where idle would be and then nothing that is not right. Since this happened all of a sudden and has not been an issue for a long period of time. I am still saying bad diaphram on accelerator pump. Not a kinked fuel line because that would cause problems at higher speeds and hard acceleration because the flow may not be able to keep the bowl full. Check the diaphragm. You can buy just the diaphragm at a good parts store
Senior User
Joined: Nov 2013
Posts: 106
Likes: 0
Replace the condenser. New ones have a high failure rate. I had a new one fail after less than 100 miles and it will cause the truck to run goofy (like a fuel related issue) before complete failure.
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