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        General >> Problems >> p0171 pinking
        
(Message started by: pedropedro on Jun 13^th, 2006, 5:32pm)

Title: p0171 pinking
Post by pedropedro on Jun 13^th, 2006, 5:32pm

can anyone help re my 2.3 ultima....idling is a liitle rough / hunts
also pinks when hot but not badly even with premium fuel ( disconnected batt etc to clear fuel tables didnt help ) ....codes show lean p0171..egr doesnt seem to be working ..cant feel any vacuum on pipe to valve..also shows a pending p1401 code..is that the diff amp unit...how can i be sure??

cleaned idle valve..changed plugs/leads ...changed o2 sensor..cleaned maf...shows only 1lb/min at speed of 1000 rpm is that right ?? if i disconnect engine goes lumpy so i assume uts working..any advice appreciated

Title: Re: p0171 pinking
Post by bizzay1 on Jun 13^th, 2006, 5:39pm

P1401 Differential Pressure Feedback Electronic Sensor circuit High Voltage

don't know exactly what it means but someone who does will be along shortly I'm sure

Title: Re: p0171 pinking
Post by sector-9 on Jun 14^th, 2006, 6:10pm

Differential pressure sensor is associated with EGR valve on newer petrol engines - it detects if gas is flowing through the valve or not by comparing the pressure either side of a venturi - if they're different then gas is flowing.

You can find the sensor by locating the EGR valve - there should be two small pipes connecting the EGR pipe itself to the sensor.

Darren