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I have a 2003 Silverado 1500 with the 5.3 in it. For the past couple months the trucks been getting the p0172 and p0175 bank 1 and 2 running rich. I have clean the maf sensor and put a new air filter and spark plugs in and cleaned the pcv valve, throttlebody and map sensor too checked for leaks around the intake manifold and around the throttle body and found no leaks also put in new o2 sensors and the codes still come back up every time. Wondering if anyone else has had this problem or know what could be causing the codes? I’ll post a picture of the freeze frame data from the codes too.
Long time lurker who finally created an account. Y'all have been a wealth of info and I really appreciate it.
I have a 2001 Tahoe LT Autoride with the 5.3. My father-in-law bought it new and I bought it from him when he upgraded to a 2019 Tahoe Premier. I've been going through the Tahoe since buying it from him. It was always maintained at the dealer and serviced at every interval.
The issue I am having now is a hard start when cold. It takes at least 2 cranks to get it started in the morning or after a long period of not driving.
I have searched the forums and found some help but no threads with results. Here is what I have done so far to remedy the issue.
-New fuel filter
-New fuel pump
-Techron in tank (one bottle so far)
I have a new fuel pressure regulator coming and will swap that next but the telltale signs of failure aren't there (gas leaking through vacuum line).
The truck had one other issue that has since been fixed. It would overheat (on the gauge) on hot days mainly at low speeds and belch coolant when turned off. I ended up replacing the fan clutch, coolant temp sensor, expansion tank, thermostat, and expansion tank cap.
Any advice would be hugely appreciated!
1997 5.7 Vortec intermittent slow start revisited.
I have a 1997 Express with a 5.7 Vortec and the CSFI system. It has 130k miles.
It is hard to start after sitting. If I pulse each of the fuel injectors with an injector tester then it starts right up. Problem description is mostly in next post. The test procedure that makes it start is in the third post.
In this video we show the step by step process for changing the high pressure fuel pump on Cliff's 2014 Silverado with the 5.3L EcoTec V8. This issue is related to fault codes Powertrain P0172 and Powertrain P0175. The exact issue is fuel being blown past the HP fuel pumps seals and into the crank case which contaminates the motor oil. If left uncorrected, this can damage internal components as the oil will break down due to the fuel and lose its lubricating ability. ?? LINKS TO PURCHASE TOOLS & PARTS FEATURED BELOW?? A quick indicator that the fuel pump is likely at fault is a smell of fuel when removing the oil dipstick. The high pressure fuel pump failure was verified by a local dealer by monitoring the fuel trim levels. I was very surprised to find out this the high pressure fuel pump is not covered by the factory power train warranty. Especially since it is literally driven by the camshaft, directly affects the health of the motor, and the codes literally read "POWERTRAIN". GM really should get their act together since this appears to be such a common problem. Note that the fault code did clear itself after a few starts of the truck. Fortunately, this is a pretty straight forward job that only requires basic tools. The process showed in this video should be identical on 2014 through 2018 Silverados and Sierras with the 5.3L EcoTec V8 These steps should also be very similar to other GM models with the 5.3L, 6.0L, and 6.2L such as the Tahoe, Suburban, and Escalade.
⚠️Try anything shown in this video at your own risk ⚠️
HP Pressure Fuel Pump: https://amzn.to/2XnUq0g
GM PN: 12697966 ACDelco PN: HPM1035
Note eight (x8) of these gaskets are required
Intake Manifold Gaskets: https://amzn.to/2Y1hZJg
GM PN: 12626354
Note: we did not need to remove the throttle body from the intake manifold during the install so this part was not required. I have listed it here because GM includes it in the recommend parts for this job.
Throttle Body Gasket: https://amzn.to/2ITJRIW
GM PN: 12632900
High Pressure Fuel Line: https://amzn.to/2XrsHf8
GM PN: 12677004
Unique Tools Needed
Fuel Line Connector Removal Tool: https://amzn.to/2WTzN7J
Flare Nut Wrench Set: https://amzn.to/2KrYqGT
Thumb Driver: https://amzn.to/2FlZVlO
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