Engine running rich

87DIB5.0

Member
Jun 9, 2018
23
3
13
Houston
I have an 87 that has been switched to mass air. Its running rich and i cant find out why. I have pulled codes and comes back code 11 which i understand is system ok. It idles fine and runs fine. I have checked the mass air sensor, 02 sensor, TPS sensor, IAC sensor, and the coolant temp sensor and all read good. The fuel pressure regulator is set at about 38psi without the vacuum line connected. Any help will be greatly appreciated.
 
Last edited:
  • Sponsors (?)


It is a ford maf sensor that is matched to the 19lb injectors. the computer is an A9L. And the 02 sensors are probably a year old.
The sensor doesn't do the match, the housing does. It could be the housing is not for 19lb. If you need one, I have 2 or 3 of the 55mm matched to 19lb. You can have one for the shipping cost. Just swap to your sensor.
 
  • Like
Reactions: 1 user
6E18B5BB-002E-4E7B-AE00-245BBC5DA00F.jpeg
86806FAD-3E91-4AA1-8408-71FA0670289B.jpeg
 
Not having cats is going to cause more fuel smell in the exhaust. You could try cleaning the MAF sensor, and the oxygen sensors may not be working very well if they're old.

Do you still have a functioning carbon canister?