codes a popping

[Craig]

Hello,

I have a 1989 SHO. It is 20 years old but is in pretty good shape inside and out. I recently put a new exhaust on including the y-pipe with cats back. The dynomax exhaust has a bigger diameter than stock. My car popped 3 codes right away - 81, 91, and 66 (MAF sensor according to Autozone). My MAF had 250K miles so I put on a 73mm tube and new electronic part. The car then popped a 19, 41, and 91, The 91 points to the air/fuel mixture. The 19 is a CID circuit failure and the 41 is 'No EGO sensor switching detected'. Can anyone give me any guidance?

Thanks,
Craig
Richmond, KY

 

[bubba]

Yeah you need a tune, to run that 73mm maf, and sounds like your crank sencer is going out.

Hello,

I have a 1989 SHO. It is 20 years old but is in pretty good shape inside and out. I recently put a new exhaust on including the y-pipe with cats back. The dynomax exhaust has a bigger diameter than stock. My car popped 3 codes right away - 81, 91, and 66 (MAF sensor according to Autozone). My MAF had 250K miles so I put on a 73mm tube and new electronic part. The car then popped a 19, 41, and 91, The 91 points to the air/fuel mixture. The 19 is a CID circuit failure and the 41 is 'No EGO sensor switching detected'. Can anyone give me any guidance?

Thanks,
Craig
Richmond, KY

 

[Craig]

Thanks for the reply.

Thanks for the reply. My crank and cam shaft sensors are fairly new. I did ask the person at C & L about needing anything else with the 73mm. He said that I should be able to put the 73mm tube in with my old electronics and everthing should work without doing anything else. The MAF code group popped when I installed the exhaust before installing the new MAF.
ct

 

[bubba]

clean it out.... maf cleaner should help you