I have a 89 s10 it just quit on me all the sudden no problems before that it is not spraying any gas out of the injector i put anew fuel filter, new fuel pump,new injector, new computer still the same thing ican hear the pump running i tokk the gas line loose it is pumping gas to the throttle body but not spraying through injector.
There's a tiny plug-in noid-lite (Snap-on YA8320) that's used to show if the injector is getting a fire signal..mine's still in the package as it's never been needed..
If it flashes than means the electrical system is ok..and problem lies in fuel system
dat's all i know on dis situation
that situation does sound like the ECM isnt sending impulses to the injector. I had that happen on my 87 S10, the ecm is a silver metal box located on the right side underneath the dash board and is held in with a bolt.
Try Changing The Relay on the LEFT FRONT FENDER !
if you have TWO relays on the fender . Change the one that has an orange and a Green wire
First which engine do you have? There are atleast 3 different S-10 Engines for 1989. 2.5 I-4, 2.8V6,
Second Check for Pulse to the fuel injector(s). If you have Pulse to the Injector(s) check the voltage of the injector(s). If they read too low they will not work. (Im not sure of S-truck injector voltages). If you have no Pluse to the Injectors next step is to verify you have ground on the proper wire and power on the other. After that you check the coil, magnetic pick ups, or module depending on engine.
Third, Unless submerged, or damaged in a crash, ECM's rarely go bad. They often get blaimed as bad when someone does not know the proper diagnostic proceedures.
Why replace a perfectly good ECM if you DONT have to?
charles i have the 2.5 I-4, i have power on the wire that plugs into the injector i talked with chevrolet mechanic he said it could be something in the distributor
On my 96 Sonoma with the 2.2 liter 4 cyl encgine I had the same problem. Checked the fuel pressure. ok. Good spark, Found it had jumped time. Try spraying starting fluid in the throttle body. If it starts its the fuel sys. Maybe the regulator bad or clogged. If it doesnt, stand back and watch it try to start. If its blowing back through the throttle bod, look for jumped time. Change the timing chain, gears, AND TENSIONER.