Running lean in closed loop
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 53
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Running lean in closed loop As soon as my car goes into closed loop, my AFR meter shows 17 and up afr. Why is it running so lean? I checked for vacuum leaks but everything seems to be fine. Any ideas? FP is at 45 psi with stock injectors. Changed both o2 sensors and still the same problem.
Teching In
Joined: Sep 2005
Posts: 24
Likes: 0
Don't know if this will help, but here goes. I had a very similar problem with my car (94 LT1 at the time). It was showing the proper fuel pressure at key on but once it ran a bit the fuel pressure dropped dramatically. It turned out to be a dying fuel pump. Is the car throwing codes? Idling funny? doing anything else at all?
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