by removing my smog pump will i gain any power and will the cat be affected by running with no smog pump. i have a 83 cfi z28

 

No and no. Unless you count a very VERY slight difference in warm up temp. Your hydrocarbon ppm will be slightly higher but that's the only down side. Your o2 sensor might not warm up instantly but it'll still warm up before the computer goes into closed loop so it's not a problem.

 

the carf will only loose about 15 lbs, and it cleans up the engine compartment. No hp will be gained really.

 

In removing your AIR system, if you were to, say, Disconnect the pump and remove the diverter vlave, but leave everything else (well, till ya had time to f*ck with it anyways...), would that be ok, or would exhaust gasses 'backfire' out through the AIR tubes, and burn sh*t?

 

I took it out all in one shot and used pipe-plugs screwing right into the stock manifolds... but I believe if you leave on the entire assembly up to right before the box, the check valves are somewhere after that point... so nothing will back fire.

You could try taking out the box, then starting the car to see if there's any exhuast coming out of the pipes. If there isn't you can leave it like that for a while. But IMO just get it all over with in one shot

 

I would like to, but I need to get rid of that diverter valve in order fer my air cleaner to sit nicely, and I really didnt wan to get into anything like that untill I put headers on...

 

JPrevost, why would the O2 sensor (I assume you're talking about the one in the driver's side collector - I don't know of any thirdgens w/the OBD II downstream O2 sensor setup behind the cat...) warm up any differently? It's upstream of the exhaust gas the AIR pump pumps into the cat.

 

you will get a little big of backfire into the motor...no real problem tho i havent seen any bad side effects yet

 

i have had the same problem except a little diffrent. i ripped everything off from the cat. to the manifolds now i have neadman headers on that y pipe to exh. ! it clears a hole bunch of sh*t.i just have a problem as now what to do with the o2 sensor that lies in my engine bay? and the check engine light! l


little help here!!!!!! thanx

 

Why don't you just have an O2 sensor bung welded (at an exhaust shop - they should have the bungs in stock even) into your driver's side header and screw the sensor in?

Unless you're running a carb instead of your TBI, I'm guessing you're getting pretty bad gas mileage w/o the O2 sensor...

 

The air pump diverts air to the exhaust manifolds on cold startup. This warms up the o2 sensor by burning the fuel that didn't burn in the engine. Pumping the fresh air in before the o2 sensor will warm up the o2 sensor faster and then after everything warms up the air diverter switch pumps only into the cat converter. That is the whole reason for the air diverter in the first place.
It's been proven by many people on the board that it doesn't really help warm up the o2 sensor any faster. In most cases the eprom closed loop time is set to a pretty long time. AND if your coolant temp is lower than 56C then it won't go into closed loop. My car takes a few minutes to get to 56C and by then the o2 sensor is plenty warm.

 

DEF get the o2 put back in.

 

i removed my smog pump and AC at the same time and it seems like i freed up alittle power the car definetly runs better now. smooth and seems to be faster..i went from using a 96'' (or something around there) belt to a 82 inch so that had to add alittle power