I changed the fuel filter the fuel pump and all the fuel lines. I can't run premium because I work for the state and we have an on site tank of 500 gallons that we use but the other ztrack runs fine so I don't think it's bad fuel
John Deere ztrack 830a impossible problem to pin point here!!! Please help
- Thread starter HSMC
- Start date
Nwatson99
Well-Known Member
Holy crap that is a lot of gaskets to narrow down, but the gasket should actually seal better with the heat from the engine unless it is the float gasket?
I only speak here due to your frustration, not my knowledge of your machine. With that many hours I would perform some basic stuff. Have you tried a compression test? Have you run a probe through the fuel line? Crud in tank that clears and then settles at the fuel port off and on? Do your read the plug color when it starts missing. You said the choke keeps it running, but then it needs fuel? Did you mean throttle, meaning it is fouled and needs more air? Wiring flops around. Check for loose or unsecured connectors that could be intermittent. Could you have a binding fuel float that sometimes sticks? Dirty inlet valve? Just some idea.
Yesterday I took the gas cap off when it was running bad, there was no change. The compression test came back a little low but still above spec. I have drained the fuel take and refilled it. The spark plugs are turning a little white on the tips so I know it's firing hot but on a air cooled motor I don't really thing that's a problem. I have never had a machine confuse me like this lol. Thanks everyone for the help I have like 3-4 days before the carb rebuild kit gets here but I just know I am going to put it back together be a few hours into mowing and then it's going to run like crap....
Don't discount plug color as a clue. Intake gaskets could provide lean out if worn out as noted by others. If you have an infra red gun take some head temps. And BTW even new coils will fail at overheat. Of course I believe all AC engines are close to overheat, having measured 310F on my Intek. No I have not measured how hot a coil gets, but they have components in them that will only tolerate a certain threshold. Remember, too a lean running engine is much hotter .Not trying to torment, but you've got a tough one, right?
Nwatson99
Well-Known Member
HSMC did you purchase all your replacement parts from JD?
If so take the coils back, somehow I do not have a clue had they did it, but the service manager at my dealer checked both of my coils when I bought the new ones and said yes one was bad and the other one was good, but I replaced both of them and my problem which is like you have described went away.
Now just a thought where it sounds like either firing or not enough fuel, the valve cover where the fuel pump is located do you see a leak around it?
If so take the coils back, somehow I do not have a clue had they did it, but the service manager at my dealer checked both of my coils when I bought the new ones and said yes one was bad and the other one was good, but I replaced both of them and my problem which is like you have described went away.
Now just a thought where it sounds like either firing or not enough fuel, the valve cover where the fuel pump is located do you see a leak around it?
Yes all the parts have come from a JD dealer, there is no leak around that valve cover and the dealer changed the valves last week along with cylinder heads so those are new gaskets. I will have the coils checked again I mean it's free why not. Also the theory on the engine overheating and making the coil go out is not a bad idea. Do you think I should pull the oil cooler and see if it's clogged? Although I am not sure how I would find out if it's clogged or not?