I have a 94 Camaro z28 4l60e with 87,000 miles that has been causing me quite a few headaches. I bought the car a year ago and it seems like the list of repairs is endless. The car was having a misfire issue which I assume was caused by water leaking from the water pump onto the optispark. I recently replaced the water pump seal, optispark seal, water pump, optispark, thermostat, spark plugs, and O2 sensor. The problem I ran into was once I put everything back in place the car would not start whatsoever! This wasn't an issue before when it was misfiring. The car cranks over but won't start, so I assume all is well with the starter, plus the battery is semi new. I was wondering if anybody could guide me in the right direction of finding out what could be the cause of this ignition problem. Can anybody suggest anything specific to check for when it comes to resolving this issue. Anything helps!

 

Have you scanned for trouble codes? Checked fuses? Perhaps you got a bad opti. What brand is it? There is a sticky at the top of the forum regarding test procedures.