Many possibilities.
Ignition, lack of spark or damaged crank position sensor - if that is broken computer doesnt see engine turning and wont send signal to ignition system
Fuel delivery system, your car may have one or two pumps
Malfunctioning anti theft system which prevents from starting
Faulty ignition switch
When you turn ignition key from OFF to RUN (engine not running), you should hear the fuel pump run for a few seconds and then shut off.
Best to check fuel pressure to be certain.
I had the same problem in Opel Vectra
My friend is working in Umi services dep
He checked the fuel pump in aspecial device
And found that the pressor in the pump is not enough , i replace anew one and the problem Disappeared.
In some cases u should check the wired cables carefuly recomanded to relaze the battary before .
Ensure that the cables is connected well.
Check the oil level. low oil pressure will cause the vehicle to automatically shut down (ASD Relay) This is a safety feature to prevent catastrophic engine failure. Also check the oil pressure sending unit and its wiring. ususally located near the oil filter
ASD is found on Chrysler's . The oil switch on GM's was a backup to the fuel pump relay and had no effect unless the fuel pump relay was bad .
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SOURCE: fuel pump 2000 chevy blazer
Check your connections. did you run the fuel pump wiring under the drivers side door sash like GM did?.. if so check for nicks in the wire or bending or cracks.. this happens.. happened to me. check your fuel pressure. 40 dollar part at an auto store. If its below 59 PSI it wont work. And blazers are very intolerable to low fuel pressure. Also try taking the negative post off your battery for a little while and then putting it back on and if you can get it started again drive around (if its safe and running decent) for at least 30 minutes to get your car computer system acclimated to a new functioning part. Did you check the fuel filter?. rule of thumb when a pump goes change the filter its always the last thing people expect because we all jump to catastrophic engine failure at the first no start moment. lol.
Make sure that all your ducks are in get my drift.. Air oxygen fuel thats the mixture you need to check all those vital parts. before pulling your head off.
SOURCE: 2003 Chevy Blazer won't start
have the computer checked out. may need reprogramming and have updates added. also check for loose or corroded connections at the terminals.
SOURCE: chevy blazer 4.3 v6 4x4
check your timing to see if it is correct, also when was the last time it was given a tune up?
SOURCE: 94 s10 blazer wont go out of four wheel drive
The electric shift solennoid on the transfer case is probably bad,common problem with these.
SOURCE: 93 Chevy Blazer S-10 4.3L F.I.
if this is the vortec engine you may want to check to confirm that the injector pot is working. The injector pot is located under the air intake manifold (top half only) & PLEASE BE SURE TO DISCONECT BATTERY FIRST. if you unbolt the top half of the intake manifold you will find the main injector pot otherwise known as the SPIDER. This part does have a history of failing and can be very costly to replace if you purchase it new. most junk yards should be able to find one for you.
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