My sky team st125 wount start

have the fuel pressure checked to ensure that it's consistent. If you have a cel light on check for those codes as well. also check for a vacuum leak and check for a stuck egr valve.

On the 2.0 and 2.4 engines there is an ignition module that fires the coil from input from the computer and sensors.
You may have to get a shop manual to have the testing procedures needed to check the module.

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if the timing is off you wouldn't have good compression
make sure you have at least 136-170 psi and the different should not be more than 14 psi.

try ebikes in bristol UK, they are A++
let me know how you get on

tom

this sounds like you have a problem with the electric fuel pump sticking, that would be where i would look, when u turn the key on with the windows up do u hear a humming noise for about 3 seconds? if not the fuel pump is the problem.

I HAD THE SAME PROBLEM WITH MY 1999 GMC YUKON WITH THE 5.7 ENGINE HAVING TO JUMP START ALL THE TIME TO GET IT RUNNING, THE PROBLEM WITH MINE WAS THE FUEL PUMP HAD TO BE REPLACED, EVEN WHEN I REMOVED THE PUMP AND TURNED THE KEY FUEL PUMPED OUT BUT WAS NOT ENOUGH PRESSURE TO GET AND KEEP THE ENGINE RUNNING.I ALSO TRIED STARTER FLUID, THE ENGINE WOULD RUN UNTIL THE FLUID BURNED OFF.SO THE SOLUTION FOR MY TRUCK WAS THE FUEL PUMP AND NOW ITS STARTING LIKE A CHAMP

i would check your ignition system. you would need a meter for this but look for broke or loose connections. if it was a fuel problem i dont think it would just start up after 20 minutes. or you might try your ignition switch. if its shorting or something then ya well it would cut your engine off real quick