I have a 93 z28 with 120k miles, a while back the car would be driving fine and all of a sudden rev up really high then die...ive talked to a few people on what this could be and they all say the same things its the "opti" well ive changed the opti, new cap n rotor....changed spark plugs and wires, my main problem is im not getting any spark at all.... i hook up the scanner to it and i get zero codes ...it says there is no communication. If anyone knows anything bout what im going through or knows where i can get a factory repair manual please please let me know asap.

Thanks.

 

try the ignition modual.

 

this is what i have. the best manual that i know of. this ones kind of spendy.
http://www.diyrepairmanuals.com/products.asp?cat=971

 

Ya ive checked that as well...im lost atm but thank you for the book page ima buy one of those idc how much it costs lol

 

make sure your getting juice to the coil and check the fuses. check around the exhaust manifold and the power box (black box on driver fenderwell) for any wires that could have gotten damaged.

 

I had the same problem with my 97. it may be optispark. is your water pump leaking? if so it probably got your distributor wet and fried it. It is a pain to chane and expensive. Sorry man

 

If it is the optispark it isnt that bad to change it. just takes some time. There are some good threads that will walk you through it.

 

guys i think he says he changed the opti but after reading again im not clear if he did. to the op, if all u changed on the opti was the cap and rotor then u didnt change the opti and i would suspect it. the main parts of the opti are in the base, readers stuff like that that i dont completely understand. lol.

 

Survey says....he changed the opti.

 

if there is no communication doesnt that usually mean pcm? i would think probably fuses like craby said or a bad wire some where