Chasing P0172 and P0175 codes
Thread Starter
Teching In
Joined: Oct 2009
Posts: 29
Likes: 0
From: Whittier CA
Chasing P0172 and P0175 codes Hey guys,
I have an 01 Camaro LS1, with just cold air intake and exhaust. My headache started with replacing the knock sensors. Now I have the rich codes P0172 and P0175. The car idles really rough until it goes into closed loop. It stalls if try and drive it in open loop.
I've replaced the MAF, MAP, and IAC. I cleaned the throttle body, new intake gaskets, replaced all the PCV rubber lines, checked the EVAP valve.
After all of that it led me to check the fuel pressure at the rail, fuel line, and injectors. I listened to each injector and I can hear each one clicking. Then I checked the pressure at the rail and the fuel feed line. Both went to 60psi and dropped to 10psi within a minute, which I believe means a bad fuel pressure regulator.
Here is a vid of the pressure at the metal fuel line in the engine bay.
With the fuel regulator in the tank how could this cause these rich codes? Or is this another issue and its the injectors causing the rich code?
Any help would be great!
I have an 01 Camaro LS1, with just cold air intake and exhaust. My headache started with replacing the knock sensors. Now I have the rich codes P0172 and P0175. The car idles really rough until it goes into closed loop. It stalls if try and drive it in open loop.
I've replaced the MAF, MAP, and IAC. I cleaned the throttle body, new intake gaskets, replaced all the PCV rubber lines, checked the EVAP valve.
After all of that it led me to check the fuel pressure at the rail, fuel line, and injectors. I listened to each injector and I can hear each one clicking. Then I checked the pressure at the rail and the fuel feed line. Both went to 60psi and dropped to 10psi within a minute, which I believe means a bad fuel pressure regulator.
Here is a vid of the pressure at the metal fuel line in the engine bay.
With the fuel regulator in the tank how could this cause these rich codes? Or is this another issue and its the injectors causing the rich code?
Any help would be great!
Last edited by p8ntballkid090; Aug 23, 2016 at 03:00 AM.
If it started after you replaced the knock sensors I would look at the intake very close. I have seen a couple times over the years where people got the harness pinched under the intake and ground out the map sensor.
Thread Starter
Teching In
Joined: Oct 2009
Posts: 29
Likes: 0
From: Whittier CA
I have a scanner that can view the PID live data and the new MAP sensor is reading normally.
Hey guys,
I have an 01 Camaro LS1, with just cold air intake and exhaust. My headache started with replacing the knock sensors. Now I have the rich codes P0172 and P0175. The car idles really rough until it goes into closed loop. It stalls if try and drive it in open loop.
I've replaced the MAF, MAP, and IAC. I cleaned the throttle body, new intake gaskets, replaced all the PCV rubber lines, checked the EVAP valve.
After all of that it led me to check the fuel pressure at the rail, fuel line, and injectors. I listened to each injector and I can hear each one clicking. Then I checked the pressure at the rail and the fuel feed line. Both went to 60psi and dropped to 10psi within a minute, which I believe means a bad fuel pressure regulator.
Here is a vid of the pressure at the metal fuel line in the engine bay.
Fuel Line Pressure Check - YouTube
With the fuel regulator in the tank how could this cause these rich codes? Or is this another issue and its the injectors causing the rich code?
Any help would be great!
I have an 01 Camaro LS1, with just cold air intake and exhaust. My headache started with replacing the knock sensors. Now I have the rich codes P0172 and P0175. The car idles really rough until it goes into closed loop. It stalls if try and drive it in open loop.
I've replaced the MAF, MAP, and IAC. I cleaned the throttle body, new intake gaskets, replaced all the PCV rubber lines, checked the EVAP valve.
After all of that it led me to check the fuel pressure at the rail, fuel line, and injectors. I listened to each injector and I can hear each one clicking. Then I checked the pressure at the rail and the fuel feed line. Both went to 60psi and dropped to 10psi within a minute, which I believe means a bad fuel pressure regulator.
Here is a vid of the pressure at the metal fuel line in the engine bay.
Fuel Line Pressure Check - YouTube
With the fuel regulator in the tank how could this cause these rich codes? Or is this another issue and its the injectors causing the rich code?
Any help would be great!
Thread Starter
Teching In
Joined: Oct 2009
Posts: 29
Likes: 0
From: Whittier CA
The long term has been hanging around -7 to -10 normally.
Trending Topics
CONDITIONS FOR RUNNING THE DTC
DTCs P0101, P0103, P0108, P0135, P0137, P0141, P0200, P0300, P0410, P0420, P0430, P0440, P0442, P0443, P0446, P0449, P0506, P0507, or P1441 are not set.
The Engine Coolant Temperature (ECT) is between 75-115°C (167-239°F).
The Intake Air Temperature (IAT) is between -20 and +90°C (4-194°F).
The Manifold Absolute Pressure (MAP) is between 26-90 kPa (3.7-13 psi).
The vehicle speed is less than 137 km/h (85 mph).
The engine speed is between 400-3,000 RPM.
The Barometric Pressure (BARO) is more than 74 kPa (10.7 psi).
The Mass Air Flow (MAF) is between 5-90 g/s.
The fuel level is more than 10 percent .
The Throttle Position (TP) is less than 90 percent.
CONDITIONS FOR SETTING THE DTC
The average long term fuel trim value is below - 13 percent.
All of the above conditions are present for 40 seconds .
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
