Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I would be pulling the spark plugs out to see if one injector has flooded the engine to a hydraulic condition.
I have seen many cars with injectors that stick open.
The next start up is generally no crank condition.
Are you able to do this or have it done for you?
Do you mean it cranks no fire, crank crank crank?
Or no crank at all?
It could be one of many things wrong here.
The first thing for you to do here is to have the vehicle scanned for codes.
Crank no fire would be unlikely more than one coil.
It could be a crank sensor that was starting to, then has ultimately failed.
An engine dtc will be set if this is the case.
I would be checking the valve timing also if necessary.
Well now it gets difficult.
One of the three things we need it missing.
We need to check for spark, fuel pressure and injector pulse, and correct valve timing/compression.
Are you capable of doing all of this?
I am not with you so if you can get a friend to help you, we'll see how we go.
There is a special procedure to check for spark.
Your engine has an ignition coil housing with an ignition control module mounted on top of it.
I don't want to say replace this, replace this etc.
An ignition coil failure on one or more cylinders would make the car run rough AND store misfire codes.
Yours only stores rich code of P0172.
Sounds more like a jammed fuel pressure regulator.
I would recommend you take the car to Chevrolet for further diagnosis.
The main thing is the engine is a timing chain engine, so if the was a problem there, it would have been noisy.
I hope this is of some help.