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98 V70 nearly stalls at a stop and a p0171 code

  #1  
Old 10-14-2013, 01:33 PM
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Join Date: Sep 2009
Location: Barneveld, NY
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Default 98 V70 nearly stalls at a stop and a p0171 code

My 98 V70 T5 233k will almost stall at a stop, idle drops to 500 or less then surges back to normal and will idle and drive fine until the next stop. I've cleaned the trottle body , replaced the MAF with new Bosch unit, spark plugs, wires cap and rotor and replaced the IAC valve with another, I have several used ones on hand. This poblem went away for a while after replacing the MAF but has now started up again. The code p0171 has been a real pia I've checked and or replaced all the visable rubber vaccum line connectors that can find in the engine compartment. Any ideas on where to go next?
 
  #2  
Old 10-19-2013, 12:12 AM
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Location: Pac NW
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Most likely a vacuum leak; have you tried the carb cleaner spray test at idle?

http://engine-codes.com/p0171.html
 
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