Had this code for a few days now, car is running rich and when coming to a stop the car either idles really low or stalls. I'm thinking fuel pressure regulator, any idea folks?
#123015, "RE: check engine PO172 code" In response to Reply # 1
I have cleared the code before came back the next day. Dont have a safc guess I will check map sensor also. btw where do you guys get filters for your missinglink, missed placed all the ones I had not too long ago.
#123017, "RE: check engine PO172 code" In response to Reply # 1 Jun-11-06 07:26 PM by turbo8u
Originally posted by turbo8u ok this is what you got: first of all, reset it. see if it, or any other one, comes back. PO172 52 Fuel System Rich MAP sensor output / Injector / Fuel pressure / Intake air leaks / Heated oxygen sensor / Adjust S-AFC check accordingly
do you have a datalogger? hows the car idle? do you have a fuel pressure gauge, and if so whats the pressure? with the datalogger youll be able to see the oxygen sensor cycle in open loop, if it sticks at any certain voltage for a long time, its probably faulty.
also if you have an ohmmeter it wouldnt hurt to check the map sensors resistance and see if its in spec (use the tech manual)
just tryin to help
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96 Black ESi 91 Red TSI AWD (RIP) 02 WRX
"turnin wrenches for nine hours in the pouring rain, just to get the beast up and running again"
Aerospace Certified TIG welder for Precision Castparts in Portland, OR.
#123019, "RE: check engine PO172 code" In response to Reply # 4
Originally posted by turbo8u check the map sensors resistance
I've never done that before... why would you want to send current from an ohm meter through that sensor? Maybe there is a way to check the vitality of that sensor through measuring the resistance that I don't know about. As far as I know, the easiest way to check if it's working is to get a datalogger and watch the output or tap the output wire with a voltmeter and check to see you get ~4.5 volts with the engine stopped and a much lower reading while it is running at idle.
#123020, "RE: check engine PO172 code" In response to Reply # 6
Originally posted by ner947
Originally posted by turbo8u check the map sensors resistance
I've never done that before... why would you want to send current from an ohm meter through that sensor?
You're not supposed to check resistance with any current flowing. Typically an ohmmeter has a 5-10amp fuse and it will pop. No current flowing when youre using and ohmmeter, no power. Just checks for continuity, excessive resistance, and shorts, etc.
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96 Black ESi 91 Red TSI AWD (RIP) 02 WRX
"turnin wrenches for nine hours in the pouring rain, just to get the beast up and running again"
Aerospace Certified TIG welder for Precision Castparts in Portland, OR.
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