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
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
Why replace a perfectly good ECM if you DONT have to?
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.
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