1997 Ford Aerostar lean condition

  • 6 CYL
  • 2WD
  • 181,000 MILES
I get a check engine light about 3 miles after I leave my house in the morning. The code was lean on right bank. I replaced o2 sensors, but did the same thing again, at about 3 miles from my house. I borrowed an analizer and reset the code as soon as it happened again. Both times the computer showed 156 degrees temperature at about 1700 rpm. After resetting the code, I continued driving, bringing the engine up to normal operating temperature. I continued driving without any light coming on. The rest of the day was uneventful. The outside air temperature has been about 90 degrees. The van really never had a chance to cool completely down for the rest of the day. Tomorrow morning I expect the same thing will happen at about the same place on the hiway on the way to work. Air cleaner is clean. Mass airflow sensor was replaced about 2 years ago. The car does not lack in power at all. It idles very smooth. Help. Thanks, Jan Hamud
Do you
have the same problem?
Wednesday, August 27th, 2008 AT 9:45 PM

1 Reply

After 3 miles of driving with the outside temp at 90 degress your engine temp should have been at about 190 degrees. I have no clue what size engine or the code. Would you post it and maybe some could help. Lean on right bank could mean several things.
Air leaks after the MAF sensor, or leaks in the PCV system
Exhaust leaks before or near where the HO2S is mounted
Fuel injector(s) restricted or not supplying enough fuel
Fuel pump not supplying enough fuel during high fuel demand conditions
Leaking EGR gasket, or leaking EGR valve diaphragm
MAF sensor dirty (causes PCM to underestimate airflow)
Vehicle running out of fuel or engine oil dip stick not seated
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Wednesday, August 27th, 2008 AT 10:24 PM

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