Lean exhaust code 44
Thread Starter
Instructor
Joined: Oct 2006
Posts: 233
Likes: 3
From: Franklin indiana
Lean exhaust code 44
I'm getting a lean exhaust code, but the car is running rich (smells, black smoke etc), so the computer thinks it is lean and is adding fuel. I've checked everything, replaced 02 sensor with AC unit, no change, can't find any vacuum leaks or anything. I'm thinking of replacing the intake gaskets anyway just to be sure. Anything else that could cause this? I have a PCMforless chip that eliminates EGR codes, but everything is still connected except for exhaust tube. Could this be causing problems?
Thanks for any help!
Thanks for any help!
Thread Starter
Instructor
Joined: Oct 2006
Posts: 233
Likes: 3
From: Franklin indiana
If it is an exhaust leak, it isn't a very big one. I replaced the IAC last summer, and put another new throttlebody gasket on, just in case. I may replace the collector gaskets with copper to see if that helps.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
When I last had a lean code on my 86, I tracked it down to the tiny, pin-hole leak in the #5 header, right where the header tube made a downward turn. Maybe 3" from the exhaust port on the head.
On the previous occasion, my 02 sensor had died.
Jake
On the previous occasion, my 02 sensor had died.
Jake
Thread Starter
Instructor
Joined: Oct 2006
Posts: 233
Likes: 3
From: Franklin indiana
Was your car running rich when you got the code? Maybe I should replace the header gaskets too. It doesn't seem like a small leak would suck enough air to throw O2 sensor off that much.
