In fact, I have seem cases where a dirty MAF caused only one bank to run lean. My sisters 95 v6 stang did this last year. As it got dirtier, it threw a code on the other side too. Not to say that one side didn't have a pinhole leak on one side.
You are right, those are good things to check for, but cleaning the MAF is the most likely and easiest way to start troubleshooting it.
Quote:
Originally Posted by Don 95Vert  If the MAF were the issue BOTH banks would show an error. The most probable cause is a tiny exhaust leak on the driver's side, somewhere ahead of the front 02 sensor. A tiny pinpoint leak will allow air leaks into the exhaust which will skew readings and trip the code. Other causes can be a vacuum leak on that side or an injector not firing for whatever reason. But 99% of the time it's an exhaust leak.
Don |