Will not start- engine rolls but does not fire
First you need to determine whether or not the fuel is getting to the cylinders. If it is, the problem has to do with the ignition side. Assuming that the engine has been running recently, Check for gas smell by removing a spark plug after cranking the engine. If there is no gas odor and the spark plug is not wet, there is a problem with the fuel delivery. Check that the fuel pump runs, you should hear it for a few seconds when the key is first turned on (it's in the fuel tank) just before the engine cranks. If the pump runs, check for pressure at the injector rail - you will need a service manual for some of this. If the fuel is getting to the cylinders, check the ignition coil by pulling one of the spark plug wires mostly off and listen for a distinct snaps as the engine is cranked. If this doesn't lead you to the problem, you'll need someone with proper test equipment to help you. It could be bad electronic ignition, bad cpu, broken wiring, battery low, short somewhere, bad switches, bad fuses, fuel pump shot, fuel filter plugged, out of time due to broken or slipped timing chain, etc. Extremely plugged air intake or exhaust could do it, too, but would more likely cause it to start and then shut-off.
Wife blew a bypass hose and kept driving it shut down at a light and will not start now. Replaced spark plugs and checked cylinder compression. I can't find what the Natural Gas compression is supposed to be I am getting readings around 115 - 125spi. But either way it isn't turning over it's just cranking.
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