This is on a 94 Z28 4L60E. The car has been having hard starting, as in acting like it has low cranking power for a few weeks, It seemed to also start smoking black a little then started missing a little too, now today I go out and it rolls over but with no fire, no spark what so ever. Over, & over,& over...The plugs are not fouled out, wires are great., I put a new coil on it but not a coil module yet. No check engine light. Is it the Opti? Is it the PCM? I also think I was having a problem with my throttle posetion sensor before this happened if that makes a difference. I still have not replaced it either. What about the Opti? Who has the best one? MSD? ACCEL? Help please!! Thanks! ..

 

When you say "low cranking power", do you mean your battery voltage is dropping severely when you try and start the car? The PCM/sensors may become very unstable with poor system voltage.

Even though the SES light isn't on, it would be a good idea to scan it for codes. It isn't unusual for a major Opti code like DTC 16 not to turn on the SES light.

 

Yeah it cranks hard like the battery is crap or the starter is weak. Im sure its the battery because now im cranking it with a jumper cable on and it cranks fine...Still no spark though. My brother is a Mechanic in Mississippi and he came for a visit this week and brought his $1600 Gennisis scan tool. However, We found nouthing out with it. This sucks...