View Full Version : Running Lean

01-06-2008, 05:12 AM
My buddy has a 96 Mystic Cobra, he put a H-pipe with Flowmaster's and he was running rich so obviously he put the MIL eliminators on and that solve the problem except for the fact that he is now running Lean on the left bank now aside for the plugs and wires can anybody help me out as to why it would be, any and all help would be greatly appreciated.

01-07-2008, 11:32 AM
If the car was running rich, MIL eliminators wouldn't fix that problem. MILs (malfunction indicator lamp) are triggered when adding an offroad pipe because of the lack of catalytic converters....thus triggering an event saying "cats aren't functioning". MIL Eliminators suppress this trigger by sending the same voltage as if catalytic converters were on and functioning, they don't change anything else. If the car was running rich, and now is running lean......it's something else going on that the MIL eliminators had no cause/effect on.