ok i have a 94 Z28 with a 5.7 LT1 and the other day i was driving home with the cruise set at 55mph and all of a sudden i started hearing a chirping sound then it started to miss but when i got back on the gas it seemed to be fine but the chirp got louder as i got back to my town i was able totellas the rpm's went down the chirp would slow down aswell . so i parked it for the night and in the morning i went to start her and it would not go then i put my foot half down on the peddle and she kicked over but she is missing and sounding real rough and now she is blowing smoke!!!!! ANY IDEAS ON WHAT MAY HAVE GONE i have a idea but im not to sure PLEASE HELP

 

cherp do you know where from. is it moor of a nock. i am not shere what would be chirping but your belt. put some belt dressing on your belt see if it stops but that dosent explane why it is running rough.

slipping on your alternator????? idk sorry not much of a help

 

Have you done any mods? I had a gasket go bad with my headers that caused an exhaust leak that started to sound like a chirp. Usually a chirb is going to be a slipping piece of rubber (serpentine belt) or air getting in/out when it's not supposed to be. I would suggest pulling your serpentine belt and checking all the idler pullies spin easily as well as the alternator. If all that checks out make sure all the bolts in your exhaust manifolds are tight (or all there). You could also check for vaccume leaks, possibly in the intake elbow after the MAF, if you have unmetered air getting into the motor it's going to cause it to not run right.

 

sorry guys the chirp is like and suddle top end knock ...and now the Z wont start i think its my can or oil pump

 

I am not saying that this is the case, but a seized roller on a roller lifter cam make an awful screeching sound. As some one said on another thread, it is difficult to diagnose a noise problem without actually hearing it.