Last night i was on the way over to a friends house and i decided to run my car real hard from a stop light. It was actually the first time I floored it since i put my new clutch in about 600 miles ago. Anyways, I had the car at about 5800 rpm's for a few second and launched from the light like normal. When I let off, the car started to run pretty rough and there was a really weird clicking noise coming from the front of the motor. I got out and checked the motor to notice any simple problems like plug problem, egr tube, vacuum leak and there was nothing that i could notice. The exhaust note has completely changed and i am not really sure what else to check other than internals. I have heard people have similar problems with broken valvetrain components and i always seems to assume the worst first. I checked the exhaust as well and it all seems to be tightly connected. Any ideas on what could be the cause of a symptom like this. Thanks

 

oh i forgot to say my car is a 1993 z28 m6 with minor bolt ons and no internal work.

 

Try to isolate the noise. Could be valvetrain, but might be the opti rotor letting loose.

 

I checked the oil pressure and fuel pressure and they are both normal, it vibrates and clicks at all rpms whether sitting still or driving the car. It gets a pretty aggressive vibration at certain rpms, but the whole car shakes no matter where you are in the rpm band. What key things should i check first before i rip into the valve covers?

 

pull the covers.

 

yup sounds like a 'train problem

and i would not run it any more until you do, get the covers off and if nothing is obvious fire it up then and look around

 

my bet is valvetrain, somethings broken/loose,

 

Could be the timing chain aswell.

Mine started acting like you said......the timing gear sheered its bolts off of the cam....destroyed the motor.....