EGR Valve

Hello,

The EGR valve is located at the front of the engine on the right side but only some had it this year. Here is a video to show you how to test it. You should know that some do not have an EGR valve. There is no egr valve on any of the 02 Chevy or gmc 5.3 engines

https://youtu.be/DqUCbbKdWf4

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers

Hello markvdb
hope this can help,

Pin Wire Color Circuit No. Function
A WHT 257 Exhaust Gas Recirculation (EGR)
B PPL 719 Sensor Return
C BRN 1456 Exhaust Gas Recirculation Solenoid Position Signal
D GRY 596 Reference Voltage Feed (5 Volt)
E RED 1676 Exhaust Gas Recirculation Solenoid Feed

location:

Hello,

P0170
P0174
The 2 codes point at the oxygen sensors,
What you should look again is for vacuum leaks - check for failed or loose vacuum lines, leaking intake gaskets, intake air tubes loose or any other source of un-metered air leaks (leaks after the Mass Air Flow Sensor)
2. Restricted fuel filter or bent/pinched fuel system lines (the last one could happens when jacking the car up on fuel line)
3. Incorrect input from other sensors, such as the Mass Air Flow Sensor wiring, which may not always drop a separate code
4. Engine misfire -. You might think that if there is a misfire then you will have all that unburned fuel and it should read rich; right? Well the O2 sensors read only oxygen content in the exhaust, so if you have all that unburned fuel from incomplete combustion then, you guessed it, you also have all that unburned oxygen. High O2 content in exhaust equals a lean reading!
EGR system will typically set a separate code. A leak in the exhaust system before the O2 sensor will also cause incorrect readings. And always check for after- market modifications. These can throw a wrench into the works! The only other possibilities (however unlikely), are wiring issues, computer concerns or a bad O2 sensor.

Hello

P0171 is on bank 1
Bank1 is the side with the cylinder #1
P0174 is on bank 2 on the other side.
Here is the diagram,

I have a marker on the side where the bank 1 is, oxygen sensors on that side.
Code does not say" sensor 1 before the catalytic converter and sensor 2 after the catalytic converter
So is the code p0174 on the other side.
Not all the oxygen sensors fail same time.
Have the injectors cleaned (walmart is cheap)
check for vacuum leak around the intake.

If Short Term + Long Term Fueling > 25% FOR TIME > 100 SEC.
P 0171 is set.
Your sensors are good, check for vacuum leak around the intake

Hello and thanks for donating

yes the 5.3L should have an EGR valve at the top right front of engine, if it's gone then previous repairs must have been made, although I don't believe the vehicle would run very well without the EGR valve if it was originally equipped with it.

EGR Valve is located on top right of engine-see diagram below: There is no egr valve on any of the 02 Chevy or gmc 5.3 engines

Hello, I am Danny.

Was this the picture that was provided? See attached -as it should be on the right front valve cover (circled in red). Some do not have an EGR valve FYI. Hope this helps and thanks for using 2CarPros.
Danny-

Welcome to 2CarPros.

I hate to ask, but I need you to start a new thread regarding your question. Please just copy and paste it to a new thread. We are trying to keep questions separated.

I hope you understand.

Thanks,
Joe.

First thing you need to do is have the codes read, Autozone does it free, Post the results with the code number(s). Even if the service engine light is not on, there should be freeze frame data stored.

Are you getting an EGR code now. What is the code that you have.