Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
I am sorry your having this problem
with the key ON is the check engine light lit up in the dash ? do you have spark at the spark plugs when cranking it over ?
will the engine somewhat run if you spray in some starting fluid or carb cleaner down the throttle body ?
there is NO check engine light lit up in the dash with the key ON ?
any codes set at all ? can you communicate with the computer ?
with the key ON does the fuses called ECMB and ECM1 both show 12 volts on both sides of both fuses testing the fuses in place through the little openings in the tops of those fuses ?
just make sure they both show 12 volts
if they do you need to check ground G103 and G105 as seen in this picture the G103 is right above the oil filter on the block
you have to be sure those grounds are all clean and tight and not broken at all
if all that checks out either the computer is bad or the connections at the computer are bad but to be sure you would need to unplug the computer connector the BLUE colored connector then turn the key ON and see if pin terminal # ***** and # ***** shows 12 volts with the key ON if they do then check pin terminals # ***** and # ***** for good grounds
if that checks out on the OTHER computer connector check pin terminal # ***** for a good ground
if ALL of those check out with the key ON then the computer is bad
who is guessing ?
if you do those tests i said too there is not a guessing game at all that is how you diagnose this issue to see what is wrong without throwing parts at it
with the key ON and the check engine light is NOT lit up in the dash the computer is dead
do to it being bad itself or it missing a power or ground at it
if the check engine light is on the computer is working
so we can scrap the computer being the issue right now
we are experts here but we have to find the cause of the engine not running
this engine needs spark and fuel and compression to run
you have confirmed spark
unplug any fuel injector connector you can get to and connect the test light clip with a wire or paper clip and stick it into one terminal in the connector you unplugged then touch the test light tip into the other terminal in the connector
when cranking it over does the test light bulb blink ?
if it does and it will NOT run even a little with starting fluid or carb cleaner being sprayed down the throttle body butter fly then remove all 4 plugs and see what the compression is in all 4 cylinders
the timing is non adjustable
you need a compression gauge tester to test compression
if it has spark and fuel then we need to see if possibly the timing chain has broken or jumped causing low or no compression
we just have to see which one of the 3 we area missing
spark or fuel or compression
pulling the timing cover and checking the timing chain marks
lets see if another expert can help
hang on another expert will reply back to you