Mazda 323,Mazda 626 & Mazda 929 Whether the compact 323, the mid sized 626, or the full sized 929, these vehicles remain very popular even though production has stopped.

p0171 bank 1 running lean

  #1  
Old 12-31-2014, 06:26 PM
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Location: Hemet, CA
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Default p0171 bank 1 running lean

My 1998 mazda 626 es 2.5L engine is running rough at idle and acceleration. I just replaced my valve cover gaskets and checked for vacuum leaks. I did run across a blue/yellow strip wire that looks to connect to the engine somewhere and leads back to the PRC solenoid. I have looked all over the Web and repair manual with no answer to where it plugs into on the engine. It looks as though it goes onto a post of sorts as its a round plug for a single wire. Any suggestions?
 
  #2  
Old 01-01-2015, 11:55 AM
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The blue/yellow wire goes to the PRC solenoid (pressure control solenoid valve) Fuel pressure regulator solenoid. According to the wiring diagram. There should be a vacuum hose coming from the fuel pressure regulator to the PRC and another vacuum hose going straight to intake vacuum. It should not set a code for one bank unless there is a vacuum leak on bank 1 intake runner.
 
  #3  
Old 01-02-2015, 11:17 PM
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Thanks, but I was asking about where that wire leads too from the prc solenoid. The wire end that's not connected is the far end from the prc solenoid.
 
  #4  
Old 01-03-2015, 08:02 AM
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The wiring diagram shows it going directly to the PCM. It does not show a connector as you describe. If the PRC was disconnected it would not give the symptoms you describe however.
 
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