View Full Version : lean fuel mixture

09-05-05, 12:25 AM
I have a 96 deville, the code came up for a lean fuel/ air mixture. how do I adjust this? thank you.

09-05-05, 10:57 AM
You can't adjust it. The PCM adjusts the mixture based on several other sensor inputs such as IAT (input air temp) sensor, MAF (mass air flow) sensor, O2 sensor, coolant temp sensor, etc. Any other codes stored?

09-06-05, 03:39 PM
As Ranger said, the mixture can't be adjusted by hand. If there is a lean mixture, it's probably due to some other problem. There could be a leak in a manifold or a bad sensor. That's why he's asking about other codes. Lay out all the codes for us and someone will probably be able to tell you what's going on and how to fix it.

09-16-05, 11:37 AM
My 2001 DHS has the same problem. P0171,P0174 codes.

Finally found intake manifold leak at phlenum(sp?) connecting manifold to water crossover. Will follow up after repair attempt.