runnin rich both banks
Thread Starter
Teching In
Joined: Oct 2007
Posts: 19
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From: midland
runnin rich both banks codes p0172 p0175 pcm says runnin rich, worst case scenario is have to change fuel pump anyone had this problem? plz help dont have the cash for a new fuel pump right now.
Thread Starter
Teching In
Joined: Oct 2007
Posts: 19
Likes: 0
From: midland
2 many diag steps just looking for a short cut or if anyone has come across this before.fuel pressure regulator intank with f/pump dont know if they sell it seperate thats what i mean by buying f/pump. diag steps says will be bad regulator
Last edited by will02; Oct 6, 2010 at 11:36 AM.
Scanners tell you the code only. Follow the steps or take it to someone who knows how to work on cars, pretty simple. No place in the diagnostics does it say to replace the fuel pump.
Why don't you tell us a little less about the car? If you thing the regulator is bad have you thought about maybe checking the fuel pressure on the rail with a fuel pressure gauge or are you waiting for someone here to tell you what your fuel pressure is. That would seem to make more sense than just throwing parts at it without a little diagnosis.
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Teching In
Joined: Feb 2007
Posts: 34
Likes: 0
From: Charleston, SC
If your fuel pressure is holding in the 50's, then nothing in the tank is the issue. Time to look elsewhere.
If you don't care to share what has been done (if anything) to your car, you'll get very few suggestions.
If you don't care to share what has been done (if anything) to your car, you'll get very few suggestions.
The fuel pressure would have to be really high. You are at least 40% extra fuel
The Purge valve can cause this if it is stuck open, but you should set a DTC for purge when no purge commanded
The MAF could be the cause, but the MAF sensor would have to show 40% extra airflow. That is hard too do. Usually the show less airflow when they are bad
The IAT sensor can cause this issue. I have seen it a few times. The IAT sensor will read lower temp than it is. Either a bad sensor or the wires break at the sensor. Before the wire break off the high resistance in the circuit causes the reading to be incorrect, but not -40° so no DTC is set. Then the car comes in later with the IAT sensor DTC set
The ECT can cause this DTC also. The scan tool will display the ECT at a low number like 70° when the engine is up to temp.
Remember you are over 40% rich to set the DTC.
The Purge valve can cause this if it is stuck open, but you should set a DTC for purge when no purge commanded
The MAF could be the cause, but the MAF sensor would have to show 40% extra airflow. That is hard too do. Usually the show less airflow when they are bad
The IAT sensor can cause this issue. I have seen it a few times. The IAT sensor will read lower temp than it is. Either a bad sensor or the wires break at the sensor. Before the wire break off the high resistance in the circuit causes the reading to be incorrect, but not -40° so no DTC is set. Then the car comes in later with the IAT sensor DTC set
The ECT can cause this DTC also. The scan tool will display the ECT at a low number like 70° when the engine is up to temp.
Remember you are over 40% rich to set the DTC.
