Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
does it stalls when at mid or full throttle?, while accelerating or decelerating ? does it starts right up with out hesitations, not even pending codes?
Have they scan the transmission for torque converter lock up problems ? have they done a torque converter lock up test? if the lock up on the transmission is activating at the wrong time this will happen and won't leave any codes stored on the engine pcm. is there a way you can ask the service writer and ask him if that was done ?
another thing you should try is Unplug the Mass Air Flow sensor (MAF) and then test drive. If the problem is gone with the MAF unplugged, check the air intake and try cleaning the MAF sensor.
i understand i am old school also but had to learn about the new electronics and yes they are not the same as they use to be, will explain about the torque converter lock up later but in the meantime can you check on the maf sensor, and let me know if any difference.
you can continue to drive with the sensor disconnected this will just set an engine light but at least you will know if this is the problem in a couple of days. here is a little inside on the torque converter just copy this address to your browser https://www.thoughtco.com/diagnosing-gm-converter-lock-up-problems-262653
yes you can come in at anytime and let me know how is working and as to the lock up i broth it up because of the symptoms but if is as you said then lest forget that and concentrate on the Maf sensor Ido have lots of other areas we can check but first lest eliminate this possibility of a maf sensor problem. I will contact you in 3 days but if it happens earlier let me know.
OK yes i expected you would have hard start with the maf sensor disconnected but just wanted to see if it stall. I guess it didn't make any difference on the problem you are having. This problem is very difficult to find because is not leaving any codes on memory, a stall condition can be cause by fuel ,spark,air,transmission,torque converter, engine mechanical failure,etc. at this point I ran out of ideas and cant think what else it can be other then maybe an Ignition Switch reason why is because you have no codes stored on memory and if you have a bad ignition switch this can happen the computer reset and all codes will be erased before you can get to read any
let me opt out and see if any body had this problem before and may be able to help ok, sorry but i try my best but is not enough, do not answer back to me this will lock the question back to me and extend your waiting time . thank you.