Demoncivic

I just bout a 98 model and im new to hondas.. I have to fix some suspension problems on it and I noticed while I was working on it that some dumbass replaced a peice of the exhaust between the manifold and the muffler and left the o2 sensor hanging. How can I fix this without replacing the entire exhaust system? I think they remkved the catalytic converter. Is it absolutely needed for it to run right?

ezone

Not 100% right because many do use the rear O2 for fuel control under certain conditions, but it is needed to pass emissions tests and keep that idiot light off.

If the CEL is always on, you would probably never know when a new problem happens unless the car quits completely.


/hugs a tree

Demoncivic

Ok... I was just wondering because the car idles up and down and I have already cleaned the iacv and throttle body with no change. So im guessing that might be the problem. Plus it is running real rich... I am eventually gonna install a new exhaust system but want it as close to right for the time being. Any info is appreciated. No emisssions tests where I live so thats not an issue just want it to run right and safely.

ezone

Missing cat won't cause that.
Look for IAC and/or FICV if equipped for sticking, and for getting HOT with coolant right away. FICV needs to sense coolant temperature in order to regulate fast idle speed down at the right time.
And vacuum leaks.




Why would you say this?

Codes?
Something else?

Demoncivic

I have already cleaned iacv and what is the ficv and where is it... I am smelling raw fuel coming from the exhaust... I was thinking that the hanging o2 sensor is the cause for it running rich like that.

ezone

IF this is, in fact, true....you have much bigger problems.

Demoncivic

Ok I dont know what I did but I started the car and revved it up to about 5000 rpms 3 times in a row and the rpms leveled out to 1000 and ran great for about 15 mins shut it off for a few hours, went back outside and started it and still ran like it was supposed to... So im guessing I had an air pocket in the iacv and when I revved the motor the water pump pushed out the air... So problem solve. But I am still gonna put the o2 sensor back inside the exhaust