The engine starts but there is too much fuel moving to the cylinders, and it is fuming way too much, black fume suffocating the engine. I've changed the refrigerant sensor, it worked properly for an hour and the problem returned. I have then installed the original one, it worked fine for a while and failed once more. When it fails, the rpm tachometer drives crazy.

My Camaro z28, 1997 suddenly does not start. The engine begins running but won't finally start working. Coils and the crankshaft sensor have been checked but everything seems to be alright. There is no spark in the spark plugs, and I was told it is the computer that is failing.

At 1000 rpms it goes to over 7000 rpm,
Temp gauge passes the top while driving and sticks. Car also dies when stopping ( possible map sensor bad). Code 34 getting part tomorrow. Checked grounds look good.

There is no spark. I've already checked the optispark and crankshaft sensor and they are both alright. The coil and ignition switch are working properly just as well. What might it be? Does the crankshaft sensor send the signal to the optispark, then to the ignition switch and finally to the coil or how does it work?