One Exhaust Header Hotter than The Other

**RX7Driver4Life** · 03-20-2011, 06:06 PM

I slapped on the headman headers in anticipation of my new exhaust coming in. I proceded to turn the car on to let idle and burn off the exhaust coating, when I notice that one manifold is smoking off the coating the other is not. I shut it down and droped some spit on the smoking one and it fried right up but on the other it would take long to evaporate. What could be causing this tempature diffrence between banks.

**RX7Driver4Life** · 03-20-2011, 06:11 PM

I slapped on the headman headers in anticipation of my new exhaust coming in. I proceded to turn the car on to let idle and burn off the exhaust coating, when I notice that one manifold is smoking off the coating the other is not. I shut it down and droped some spit on the smoking one and it fried right up but on the other it would take long to evaporate. What could be causing this tempature diffrence between banks.

**95ImpySS** · 03-20-2011, 06:36 PM

Is the engine running ok? IE not missing. Is it modified?

There is a table in the PCM that will allow Individual cyl trimming.

Also you could have a bad O2 sensor causing one to run leaner thane the other.