Question about 1985 Chevrolet S-10
Im getting plenty of fuel pressure to the throtle body ,fuel pump is working,fuel filter is clean the injector is good getting correct amount of voltage to the injector ,also replaced the prom and pcm, ohmed out the wires from the injector to the pcm all looks. also found that if i turn turn the key on and ground the negative side of the injector it will spray wide open. WHAT TELLS THE COMPUTER TO TELL THE INJECTOR SPRAY?GOING CRAZY PLEASE HELP!
Dude I had the same thing drop the fuel tank and check the hoses on the pump, mine had become weak and were sucking shut when the pump came on, also clogged fuel strainer on bottom of pump, it stumped everybody but it makes sense start at the beginning and confirm, don't start way down the road on a crazy side street and try to diagnose
Posted on Aug 11, 2009
Electronic engine control unit calculates the mass of fuel to inject, not how wide it sprays. It's the type of solenoid that you use. Some have wider spray nzzles than others. An external Fuel pump helps the delivery of the fuel. Also since fuel injectors rely on mass air flows nowadays, you have to have proper mixture coming through. hows your Fuel pressure regulator?
The throttle position sensor reports to the computer the position of the throttle butterfly valve, which the ECM uses to calculate the load upon the engine-but inorder for this to run, you may need an external pump.
Sounds like nothing is being grounded back to the ECM to even give a reading. If your regulator is improper and you do not have a external pump (depending on your model), than check those. If not, Start from scratch.
If you ever lose your way, go back to the beginning_REWIRE!
Posted on Feb 16, 2009
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