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So it cranks over, but does not fire. Since you can hear the pump turn on, locate the bleedoff/test valve on the injector fuel rail, (looks like a tire valve). Use anything but your fingernail and, using eye protection, depress the valve stem, there should be about 40-45 PSI in the fuel rail. If you have fuel then the next thing is to disconnect the connector off of any one of the 8 injectors, (key off, of course). Get out your 12 volt test light, turn the key to on, and check for current at the two terminals of the injector connector, one of them should be "hot". If so, then connect your test light across the two terminals of the connector and crank the engine, the light should blink on and off. If all of this checks OK, then the fuel system is. Next, check for spark at the plugs. If everything checks OK, then bump the engine over until the timing marks are indexed, remove the distributor cap and check where the rotor is pointing, it should be pointing at #1 or #6 plug wire. If it isn't, then your timing chain has "slipped", in the 302 usually the teeth are torn off the camshaft sprocket. If you didn't get any power at the injector connector, then your switch could be defective, the main power relay could have failed, etc. If you have power, but the light doesn't blink then the computer isn't "firing" the injectors,check the power supply to the computer. If you don't get any spark to the plugs, suspect the TFI ignition module in the side of the distributor, they have a habit of failing. |
RV and bus conversion info since 1996.
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