My friend has a jdm b16 and he increased the compression. It was running fine for a year then suddenly the exhaust started smelling like gas and the meter says he's running rich. What can suddenly cause it to run rich? Where should we look first? Thanks.

 

Does he have a wideband o2? or just a autometer gauge?

I found that on Colder days my car runs a little bit richer. but now that i got hondata coming with Iat and Coolant scaler for fuel

 

A stuck open injector would cause it.

 

I had my TPS plug come off recently and it ran real rich until I fixed it.

 

A misfire will not ignite the A/R mixture and make it seem like it's running rich, when it's actually just not firing at all.

 

misfire, might sound like something, i know someone looked at it recently and said the timing had to be adjusted. Thanks for your input guys!!