I had an 89 rs that made knocking like noise at idle and when decelerating and the whole issue was a bad exhaust manifold gasket. It sounded like it was coming from the top end of the engine too. I have an 86 fiero gt with rod knock and it sounds like its coming from up top till you get underneath it, you can hear that here http://www.youtube.com/watch?v=0eGvzuA1yXs

 

are these hard to fix? also i do have a couple gaskets going out on my exaust, like my donut gaskets but from my cat back its all new, ill replace those manifold gaskets, how hard are they to replace?

 

it doesnt sound like that fierro in the video, hoping its that gasket!!

 

maybe its lose tourqe converter bolts? i know my engine moves alittle so maybe this is it?? hopefully?? HELP PLEASEEEEEE

 

Exhaust manifold gaskets aren't too difficult to replace it's getting them off without breaking bolt's that's the fun part. You could inspect around the manifolds to see if there's any carbon from where the exhaust gasses leak out if you don't see anything I would just leave em alone.

 

okay, anything on the loose converter bolts?

 

Check your tranny mounts. My Dad's old 89 RS with a 305 had a bad tranny mount and the back of the motor would come up because of it.

 

guys over at camaroforum think its one of my lifters, any input?

 

Only way to tell is to listen to the bottom end... More than likely it is pretty serious. I had several people tell me my 2.8's noise was a lifter or "piston slap". A couple months later, the #4 connecting rod blew itself into 4 pieces and took out a good portion of the driver's side of the block. The #4 rod will almost always go first since that is usually the first to lose oil pressure when there is a problem (just like the #3 in a Chrysler 4 banger).

 

im taking it to my mechanic tomorrow so he can look at it..

 

that's a good idea. I will tell you I had a grand am that had a worn motor mount, and the vibration of the engine at idle made it sound terrible. give it a little gas, things smoothed out and it was fine

 

yeah iv had several ideas, exhaust manifold gaskets,valves,lifters, loose torque converter bolts, injectors, push rods, conector rod, ect im lost..

 

thats what mine were. i had a knock also and when my uncle took apart my 2.8 he noticed that my torque converter bolts werent on properly....well 2 of them. i think he said the bolt was too long or something like that but he said when it was at low rpms it would rattle or actually wobble in this case and cause the noise. at first he said it might be the intake manifold or exhaust manifold i cant remember much but in the end it was the bolts