running really lean Options

[d3ath2009]

hey i just put a header on my car and gutted the caty.. sounds wicked and u can feel the power difference, but now its running incredibly lean... what can i do to get it to run a little richer?

[d3ath2009]

i kno its running lean bc its killing my milage and you can smell the gas coming out of the exhaust... i was told that the heat from the header could cause this and i need to cool the engine bay.. any suggestions?

[Jamchell]

i kno its running lean bc its killing my milage and you can smell the gas coming out of the exhaust... i was told that the heat from the header could cause this and i need to cool the engine bay.. any suggestions?

Hmm, if you are running lean then you will usually have better rather than worse fuel economy, you sure wont be smelling any fuel coming out of the exhaust and you will have 1 or more cylinders missing under load as well.

I bet you are running in open loop since you don't have a proper setup for your O2 sensors, this will cause the car to run RICH and you will have a loss of MPG and notice the odor of fuel coming from the exhaust. Removing both the stock manifold and catalytic converters on a car with OBDII is going to cause issues and you will need to find a way to trick the ECU into thinking those sensors are working again.

This post has been edited by Jamchell: Jun 25, 2010 - 6:02 PM