Ok guys heres the deal, I just got this 94 t/a and it had a very bad miss when I got it and the previous owner drove it around like that. He talked to some people and they told him it was probly the opti. Well that wouldnt be a problem. So I get it to the house and start tearing it apart and find that number 5 doesnt even have a plug wire on it. So I put a new plug in it (cause it was black and full of carbon and fuel), and a wire and fired it up. Well it was a whole lot better but still had a miss to it. And it had a pretty bad exhaust leak. I had a set of long tubes laying around so I desided to put them on while I was at it. Come to find out the whole drivers bank was fould out. I think number 7 was not that bad but 1,3, and 5 were just all gouped up. Oil and water look good. No smoking at all. So no real signs of a head gasket. I just put the long tubes on and changed all plugs and wires. Well my question is; Will it feel like it is missing with open headers and no O2's hooked up at all? I just wanted to see if I had fixed it before comletely finishing it. I didnt run it long, but it seems to idle fine but doesnt rap up good. It feels like it still has a miss when giving it fuel. Im just hopeing this is cause of no O2's and not burnt valves or something.

Sorry for the long post but any help would be greatly appreciated. thanks
Billy

 

Buler.......................Buler

 

O2's aren't that hard to put on, so I would hook them up and try it again just to make sure.

 

Is it running rich? Without O2's it's quite possible to have a hesitation, especially if it is running rich. It will never go to closed loop. My car is running terrible in open loop. Plug in your O2's.

Edit: if you run long enough with rich condition - you can easilly foul your new plugs and get even worse misfire.

 

Yea I didnt run it but for maybe 10-15 sec. The last lt1 I built had all the bolt ons hot cam etc..... and I fired it up and drove it to the muffler shop with open headers. But that one had the O2 bungs in the headers. The headers that I have on the T/A dont have the bungs in them, so thats why I just left them off. Another guy mentioned the egr. I welded the plate up that goes on the back of the intake but didnt take any electrical connectors loose or anything. So maybe that is it. Its a start!