Start by checking under the distributor cap. See that the rotor is in good shape, and has no carbon tracks on it. If there is any doubt, replace the cap and rotor. Check to see that the rotor is actually turning when the engine is cranked.
Keep in mind that the engine needs THREE things to run:
1) Compression
2) Spark - and at the right time and place.
3) Fuel and air mixture.
One of the three is not as it should be. There are many possibilities. I'll try to work you through the most common ones to begin with.
Does the engine sound normally when you are cranking it? If not, then a compression test is in order. A timing chain could have gotten loose enough to affect your valve timing. A compression test will show this.
Is the distributor rotor turning evenly? I have seen the gear on the distributor "apple core" and not fully engage the drive gear. This will cause the ignition timing to be wrong, and will cause the engine not to start.
Check throttle position sensor voltage. The sensor is located on the throttle body opposite the throttle cable connection. Without unplugging the connector, probe the GRAY wire with a YELLOW stripe. You can do this by inserting a straight pin into the connector alongside the wire. Check voltage to engine ground with a digital meter. With the ignition on and engine not running, and throttle closed, the voltage should be from.75 to 1.0 volts. Any higher indicates a bad sensor, and is turning off the injectors while you are trying to start.
This should get you started. Once again, post back with results, and if necessary, we can continue.
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Thursday, March 16th, 2017 AT 12:07 PM
