slicker358

My stock 1995 LT1 ran fine until about 10 weeks ago. Suddenly would not start. Replaced fuel pump and pressure regulator. Fuel pressure now reads 42 pounds and maintains after pump shut off. Replaced coil and ignition control module. Still no start. Put light on spark plug wire, as engine cranks each plug firing, but spark appears weak. Will not start even with starter fluid. I have 2 questions, although further suggestions are welcome. Will weak spark prevent an engine from starting? Second, as the spark is apparently being distributed to the plugs, however weak, does this mean the problem is isolated to the optispark/distributor/rotor assembly? Thanks for your help.

Cliff Harris

Usually that eliminates a fuel problem. I suppose it's possible that you might still have one, but it's unlikely.

So your problem appears to be spark related. That could be spark at the wrong time, spark going to the wrong place (wires crossed) or some other issue, like loose connections.

You said "weak spark". "Weak" is pretty hard to define. I guess a spark tester could help you determine if that is indeed your problem.