I'm not too familiar with the BBK filter set-up. If it is anything like the K&N filters that require being treated with oil, then I would suspect the MAF sensor. The other thing you mentioned that I have seen before is the modified exhaust system. If you have modified cat converters or no cat converters at all, then the downstream O2 sensors are not sending the signal that the computer is expecting. This can cause a rich condition on the upstream O2 sensors. Find out what they have done to the exhaust and if there are even any downstream O2 sensors. I've even seen installers use a shunt and leave out the O2 all together. All this info will help us determine what's going on. Blackop555 is correct, though, check the obvious first and then consider the obscure.
Tuesday, April 8th, 2008 AT 10:25 PM