okay,I couldn't get the original carb that I rebuilt to idle right.So I took a chance on one from the junkyard.(Hitachi).Didn't do anything but spray it out with carb cleaner and plug it in.Idles fine with just a little hesitation when step on the gas.Runs pretty good when I take it out on the road.But when I'm down on it and let off the gas it will spit and sputter through the exhaust and sometimes backfire.The original downfall pipe was wasted when I bought the car'so I replaced it with 2" stainless pipe back to about where the cat would connect to the 1 3/4 pipe .It is 1 3/4 back to the muffler,new turbo muffler.The question is should I take the car down and have interstate muffler run me 1 3/4 all the way back and see if my problems dissappear,or should I get a WEBER and see if they dissappear.I have been messing with this engine issue since christmas,and I'd like to be done with the body work before summer gets here.Thanks for your help.

Birddog

85 gl 4wd

its possible you may have aslight vacuum leak, henge the popping and burbling of the exhaust upon deceleration. hitachis will wear at the throttle shaft

 

go with the weber before you blame the exhaust, my 2 cents

If I read this right, you have removed the cat from the exhaust, (it was in the Y-pipe). If that is true, you will need to plug the hoses to the AIS/ASV systems, (at the air filter can), or just plain remove those systems outright. Those systems pump extra air into the exhaust to aid the cat in doing it's job, hence your unwanted noises.

 

I did this to mine when I installed the 2" exhaust system, and had the same burbling and kapows from the exhaust on decelleration. Tended to PO the nieghbors at 5:AM. I removed all of the AIS/ASV crapola, and plugged the steel lines where they come off from the exhaust ports.

 

As far as pipe size goes, I'm running full 2" duals, no cross connection, turbo mufflers, and the Weberized EA-82 seems to like it. (Nice ear candy too) Others are running 1-7/8" from the engine to cat, (if needed), then 2" on back, thru muffler of choice.

 

Been lots of debates on here over pipe size for the Soob engines. I went with 2", because it matched the port size in the head. Just seemed to be the right thing to do.