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PierceIt

2017 Cub Cadet Challenger 750 EPS won't start

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Hi everyone - I was driving my 2017 Cub Cadet Challenger 750 EPS today on the ranch when it dies on me. It started right up - and then as i was driving after about 50 feet the engine just turned off. It was running perfect before it cut out on me. No alarms, no weird sounds or smells. It just turned off. 

When I turn the ignition key, the starter cranks away and the battery and starter turns fast and strong - but the engine doesn't start.

I've confirmed gas flow to the carb - that the fuel filters are clean and clear. I've replaced the spark plug with a brand new one. I checked every fuse with a meter. I have confirmed air filters and airflow are good. 

But the darn thing cranks away without the engine even making a sputter or even attempting to fire.

Is there a kill switch somewhere that could have been tripped? I checked the seatbelt sensor, the brake sensor, and parking gear sensor - all are working and i'm in Park, pressing down on the brake, and have the seatbelt latched when i try to start. but - nada!

It acts like it isn't getting a spark. but like i said i put in a new spark plug. I have a feeling there is a sensor or an electrical kill switch somewhere that tripped. 

open to any ideas.

thanks all

Pierce

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Pull the spark plug out , and put the wire back on it, ground the plug to something metal, engine head, whatever, and crank it over, look for a spark at the electrode. Another way to check for spark is to take the plug out, put a small amount of gasoline down the plug hole, reinstall the plug and wire. Turn it over. If it cranks then dies. Fuel problem.

If nothing, no spark

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Thanks Travis. I should have added that have done what you suggested too - I pulled the plug out, connected it to the spark plug wire and while holding it near the engine head turned the key in the ignition.  There was a strong blue spark and gas/vapor sprayed out of the engine head through the spark plug hole as the piston moved while the engine cranked. I then put a little oil and gas down the spark plug hole, re-inserted the spark plug and tried to start again. It seemed to have more compression this time and the starter cranked a bit slower for a few seconds but still the engine didn’t so much as sputter one bit or try to start. 

I’m at a loss for what to explore next. I’ve got gas, air, and spark. But the engine doesn’t even try to sputter or ignite. Compression might be a hair low because the starter does seem to be turning just a hair faster than usual. 

I had also swapped the gas out for new gas.  Didn’t make a difference either.


 

 

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If you have Fuel, Spark and Compression, the next thing you need is the Correct timing for the plug to fire the spark.

I'm not sure how invasive it is to check timing on this machine, so I would look at timing as a last resort. Unless you know more.

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I've done a dry and wet compression test and based on the results I am now leaning towards this being either piston rings or timing chain or  timing woodruff key 

stay tuned

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Turns out the timing chain came off due to worn camshaft and sprockets. Need to replace $700 in parts.

Never missed an oil change and always used good synthetic oil. The metal inside these engines seems to be very cheap metal. 

Pretty disappointing since it only has 180 hours on it and less than 500 miles. 

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      I was driving my 2017 Cub Cadet Challenger 750 EPS today on the ranch when it dies on me. It started right up - and then as i was driving after about 50 feet the engine just turned off. It was running perfect before it cut out on me. No alarms, no weird sounds or smells. It just turned off.  When I turn the ignition key, the starter cranks away and the battery and starter turns fast and strong - but the engine doesn't start. I've confirmed gas flow to the carb - that the fuel filters are clean and clear. I've replaced the spark plug with a brand new one. I checked every fuse with a meter. I have confirmed air filters and airflow are good.  But the darn thing cranks away without the engine even making a sputter or even attempting to fire. Is there a kill switch somewhere that could have been tripped? I checked the seatbelt sensor, the brake sensor, and parking gear sensor - all are working and i'm in Park, pressing down on the brake, and have the seatbelt latched when i try to start. but - nada! It acts like it isn't getting a spark. but like i said i put in a new spark plug. I have a feeling there is a sensor or an electrical kill switch somewhere that tripped.  open to any ideas.
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