1996 Ford Windstar lean condition on both banks

Tiny
CHEZGIGI
  • MEMBER
  • 1996 FORD WINDSTAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 157,000 MILES
In trying to solve this problem I have replaced both converters, all 3 o2 sensors, Idle air contole valve, tps, maf and checked feed on all connections all check out. Still get 171 bank 1 lean and 174 bank2 lean also I get poping when I try to accelerate and have poor performance, so poor I can't run a/c and can barely drive vehicle. I, m lost?
Wednesday, September 8th, 2010 AT 4:55 PM

1 Reply

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Start by checking for vaccum leaks

On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is more negative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. Note that both Banks 1 and 2 will exhibit negative corrections for 2-bank system. If only one bank of a 2-bank system has negative corrections, the MAF sensor is probably not contaminated.
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Wednesday, September 8th, 2010 AT 5:17 PM

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