I have a prochem performer with a Nissan a12 engine. At the beginning of a cleaning the machine runs great but about by the time im 3/4 into the job the machine starts to stumble like its not getting enough fuel and wants to die what could this be?
lack of fuel? Did you check the fuel filter? I would be more inclined to believe it is an ignition part failing, as coils, wire and what not heat up any faults (cracks) will open up and it will lose conductivity and fail to perform.
I did have trouble with the ignition it shut off and taped the circuit breaker and the ignition worked again and started i didnt change any of those parts yet it as it only did that once not sure why but i think i should. I didnt think that would make the engine stumble though?
by taping the breaker so it would not trip would cause what ever it is trying to protect burn up if it has a problem instead of breaking the circuit...if there is a burnt wire or a loose connection it is possible that it may just stumble....(normally they just get hot and burn when it cant trip).......it is very important that you replace that breaker and see if you can figure out why it was tripping out....it may have been just a bad/weak breaker....I would still replace the fuel filter...
I have the same machine, and same engine. I am also suddenly having this problem. I have replaced plugs, wires, cap, rotor, coil, and air filter. Also new fuel pump, fuel filter, and fresh gas(87 octane). No change! I have not changed the condenser in the distibutor. I have a buddy who is pretty good with this weird stuff and he thinks that I need a higher octane fuel because he says it sounds like it is dieseling from running hot and igniting the lower octane fuel midway through the compression stroke causing it to pop around through the exhaust, and stumbling around for about 5 min and then dying. It has to sit for 10 min or so before restarting or it won't start! I have verified spark throughout this process and its always there. I just can't figure out why now, IF thats the issue.
Also to mention that it runs great for 45 min to an hour before this starts happening. When it does start, it begins by backfiring through the exhaust a bit and eventually starts throttling up and down, choking around and then falling flat on its face!
Sounds like something is heating up. Like a condenser. Or maybe the gas line is too close to something where it is boiling the gas. Might want to check the float level in the carb. With all that bouncing around; the float level might change too much where there isn't enough gas in the bowl when it heats up. I've seen this happen on smaller engines. Mine had the a15 in it. Never had that problem though. Hope you find the problem.
Jon Don might have them. Or a local fork truck company. I find that the auto parts stores usually need to know what car the engine is in. Of course their not in a car.
I had a prochem with this engine and would happen after running for a long while. I believe it is vapor lock and has something to do with the ethanol they are adding to the gas. I would had a very hard time re starting after it was hot and would have to give it a quick spray of starting fluid.
The guy at a local supply house said its my fuel system, that it needs to be updated it needs more fuel and a return for the fuel to the fuel tank so it doesn't get to much fuel.
Jmo, the main purpose for a return is to circulate fuel back to the tank so it doesn't sit in the hose near the engine. In hot conditions the stagnant fuel in the line can boil, causing vapor lock (thus my suggestion earlier). If vapor lock is your problem, insulating or wrapping the line from the fuel pump to the carb with wet rags can (temporarily) cure the problem, which would confirm the diagnosis. A weak fuel pump (like Jim said) can make the vapor lock problem appear, or get worse.
