[ta2tony]

This is my first post, I have searched but not seen a problem like mine. My girlfriend drove her 1997 c1500 5.7l vortec 5 speed 2WD (200k miles) and parked it. In the morning it would not start. It turns over but will not fire. Furthermore, when turning it over, the motor seemed to 'tighten' up as though it didn't even want to turn. There is no 'security' light and the diagnostic showed no error codes when hooked up the the OBD-II.

Here's the stats: Pressure gage on fuel line reads 66 pounds when cranking. Got spark at the plugs. Turned the engine till #1 compressed, mark on the balancer matched the TDC mark on the timing chain cover and the distributor rotor was pointed at the #1 location, so it appears the timing is OK.

We replaced the fuel pressure regulator, fuel filter, and spark plugs. The distributor cap and rotor are fairly new. We also dropped the exhaust prior to the catalytic converters in case they are clogged. The motor turns more freely now but still won't start. Aside from throwing a timing light on it, I don't know where to go from here.

You all seem to know your Chevy's, any ideas would be greatly appreciated.