Hi All, My 1999 died on highway a few weeks ago and I've been investigating possible causes. First thing was fuel system thinking maybe a bad fuel pump. I was contemplating pulling tank or bed off, but wanted to check fuel pressure first. I purchased a fuel pressure gage kit ($50) to check fuel rail pressure (there is a convenient Schreader (bicycle type valve) connector in engine compartment). When connected and ignition switch in 'Run', fuel rail presure was 40 psi, right where it should be. This also elimenated anu electrical problem or rollover switch malfunction. When I went to 'start', gage needle pulsed between 40-45 psi. This indicated fuel injectors were operating, otherwise pressure would remain steady. So fuel pump is OK! No tank or bed removal.
On an earlier posting, 'dizturbe3d' suggested a timing belt failure. How to check this? If timing belt is broken, valves are not cycling when engine is cranking. Since the engine is basically a compressor, i.e., air comes into engine and is exhausted WHEN the valve are properly lined up, which is the function of the timing belt. With a broken timing belt, air comes into engine from intake AND exhaust, depending on how valves are positioned at each cylinder. There is no net air flow through engine. To check this, I put a plastic bag on the exhaust pipe and with a rubber band to hold in place. Upon cranking engine, bag inflated and deflated slightly in a cyclical manner (there should not be air going into exhaust). If valves were working properly, bag would have filled and burst. End of investigation.