i own a 92 honda accord SOHC automatic 2.2, i straight piped it for better flow issues. i assumed you could do the same with a 94 honda accord SOHC automatic2.2; but since i staight piped the 94 after warming up my RPM's jump up and down on idle like it's hunting. any way to bypass O2 sensor from eliminated catilytic converter. any help or suggestions would be greatly appreciated. Thanx

 

The O2 sensor is what tells the ECU what the A/F is and fine tunes it for power and economy. Removing it would be foolish. And unless the catalyst was plugged you gained no appreciably power with a SOHC AT car.

 

even though i put headers i would still need to use a cat? i figured it was causing a restriction of air flow?

 

Removing the catalyst will not gain you any power. A catalyst is only a restriction when it mechanically fails.

If you are looking for better acceleration, a change in transmission would be the ticket. The Accord transmission has tall gears(numerically lower) which are better for fuel economy, a Prelude transmission has shorter(numerically higher) gears which would offer quicker acceleration.

If all you have done is install a header then you have a few more things to do to improve the power output of the engine prior to removing non issue components.

 

Remember back pressure is your friend. Unless you are running a 280+ horse power engine having a straight through exhaust system will destroy your low end power.

 

No. No it is not.

Scavenging is your friend.
Velocity is your friend.

Back pressure is not.

 

I despise the words back pressure....why do so many people always say exhaust systems need back pressure...........

A modern fuel injected engine does not gain tq from exhaust back pressure. Not will the exhaust valves burn due to a lean burn Air fuel mixture. Supposedly cause by higher flowing exhaust systems. Since the advent of Fuel injection and the ECU (PGM-FI) there is no need to worry. It takes care of all of those old myths.

OP,

Is your O2 sensor plugged into the header?

The 94 OBD1 Accord still only had one O2 sensor. There was no O2 after the cat so the O2 sensor should not be your issue. Unless you have removed it. You need to have the primary O2 plugged into the header/collector. Without it your not going anywhere. the only way to bypass it is to have an aftermarket/ or chipped ECU tuned on a dyno and running open loop. Honestly not a very good option for a daily driver.

 

thanks for the insight guys i guess i deleted sumpin i needed so since this thread i have looked into a high flow cat, would that be OK or it really makes no diffrence.

 

A Cat is not essential for your engine, you really only need it for emissions. If your O2 sensor is in the path of the exhaust gases it would not be the cause of your issue......

The cheaper high flow cats are usually no more high flow than a stock cat. Unless it is a larger diameter or has fewer cells. Ether way On a stock 2"-2.25" diameter exhaust a larger cat won't really make any difference.

 

Yup.

Having an exhaust larger than the downpipe from your header is also pointless.
Mega 3" exhausts are too large,also heavy, and can actually be detrimental to exhaust flow as the gases can stall in the exhaust system. Not good for the almighty powa.

 

Check your IACV, But an 02 sensor is good, Something that is running high rpms the larger the better but on a sohc auto ya its going to hurt more then help.