[ufcman]

i have a issue cant figure out my zforce was freshly rebuilt i road it couple hundred miles then it just started running like crap,then shut off wont start just cranks so i added new fuel pump new injector new plug it has spark,injector is shooting gas as it should no error codes plenty of compression air filter is clean i also clean throttle body changed all fuses still no luck just cranks no start not even trying to start
i also put a new coil and wire on it just to make sure 

[NMKawierider]

Check the actual compression and...check the valve timing. Also check the valve lash. Something's missing..just need to find out what.

[ufcman]

well just had the dealer install new valves and all the other goodies in there

[NMKawierider]

Then take it back to that dealer. Must have done something wrong.

[ufcman]

would never take it back to dealer they charged me 5k to do the job never again will i go to a dealer

[doug80638]

Did you test spark, fuel, and compression before replacing all those bits?

If you have fuel, spark, and compression, then it's time to check the timing. Pull the valve cover off and check the timing chain is tight and the timing marks are correct at TDC. Check for any damage in the valve train.

After that, I would start to suspect the ECU.

[ufcman]

i did check that all seems fine only thing i havent checked was compression but couple hundred miles shouldnt kill the engine that bad only thing left that i can think of is the pickup coil on flywheel might be on its way out

[doug80638]

Your initial post said compression was good, but now you say you didn't test it.

Test it.  One worn or sticky valve can crush compression.

If the CPS wasn't working, you would not get spark and the EFI system would not energize the injectors.
There are videos on youtube that show how to test the CPS.

[NMKawierider]

Agreed. Must confirm all mechanicals are correct first then go to electrical and fuel. A lot can happen in a short time..broken rings,valve spring,warped stem, seizing guide,rocker roller failure,cam sprocket bolt came loose...lots of things that won't be obvious until certain things are done like a compression and leak-down test and valve timing check. 

[ufcman]

well guess your right i did get parts from china all cheaply made so ill check it all

[Skbball06]

Find a dealer that has BG products look for three part kit EPR,EPC,44k. Auto dealerships will likely have it somewhere near you and can buy kit from them.
EPR will clean sticking rings restore compression etc.
EPC with new oil (additive)
44k best fuel cleaner you can find.

Good luck!