171 & 174 Code help
Thread Starter
Instructor
Joined: Jul 2008
Posts: 233
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From: Acworth GA
171 & 174 Code help
Can't seem to kick the 171/174 codes. ( both banks running lean) The car runs rough and stumbles from a start. When I unplug the MAF it runs great except for the check engine Light. ( its my understanding that the computer goes to a rich setting when the MAF is unplugged). Cleaned the MAF with the correct cleaner, and even swapped out one with no help. I have looked for a vacuum leaks and haven't turned up anything. Whats next? Check the o2 sensors? How? Anyone had this code, what was the fix?
