P0171 System Too Lean bank 1 Chevy Trailblazer "Fixed with no parts"

Рет қаралды 601,711

6 жыл бұрын

Customer Concern: Malfunction Indicator Lamp (MIL) on. Powertrain Control Module (PCM) DTC P0171.
Average Reported Mileage: 100343
P0171 p0174 System Lean Trailblazer "Fixed with no parts"
Mass air flow sensor cleaner: amzn.to/2HbyNJm
Air filter and tune up kit for Chevy Trailblazer: amzn.to/2vt1pbA
Smoke Diagnostic Machine amzn.to/2tbEMoe
Tests/Procedures: 1. Check for a vacuum leak by spraying water around the engine and see if it reacts.
2. At the Mass Air Flow (MAF) sensor connector locate, backprobe and ground the Yellow wire. Reset fuel trims using the scanner and see if Long Term Fuel Trim (LTFT) stay in single digits.
3. Access the fuel system test port, near the fuel tank and fuel filter.
4. Connect a pressure gauge to the port.
5. Fuel pressure should be steady at all loads, 50-57 PSI.
6. Verify that the fuel pressure value is between the range of 50-57 and not dropping under load.
7. Check fuel filter for restriction.
8. Clean the throttle body assembly.
9. Run cleaner through the injectors.
Vehicle Application:
2006 Rainier 4.2
2006 Trailblazer 4.2
2006 Trailblazer EXT 4.2
2006 Envoy 4.2
2006 Envoy XL 4.2
2006 Ascender 4.2
2006 9-7x 4.2
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Disclaimer:
Due to factors beyond the control of The Flat Rate Mechanic, it cannot guarantee against unauthorized modifications of this information or improper use of this information. The Flat Rate Mechanic assumes no liability for property damage or injury incurred as a result of any of the information contained in this automotive repair video. The Flat Rate Mechanic recommends safe practices when working on cars or trucks with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this repair video. Due to factors beyond the control of The Flat Rate Mechanic, no information contained in this automotive repair video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

Пікірлер: 188

@FlatRateMechanic 6 жыл бұрын

Things I needed in this video. Smoke Diagnostic Machine

@bgtoups 4 жыл бұрын

Thanks for a very clear method for diagnosing a problem and demonstrating how to verify and confirm the fix. Great video.

@MitchGeddes 5 жыл бұрын

Saved me a trip to the shop. Had that hose unhooked on my Envoy as well. Big thanks!

@casey7223 Жыл бұрын

Exact hose loose on my 08! THANK YOU for this quick video, I know this is not the fix all the time, but helped in my case. Cleared the code, now time will tell.

@jackbrown3270 3 жыл бұрын

CHECK YOUR O2 SENSOR BY THE MANIFOLD!!!! that fixed my light even tho the code says to replace maf sensor

@ibraahimahmed9130 Жыл бұрын

I really appreciated the free information mechanic was trying to change me 300 I watched your video did it myself thanks again

@user-nt1xz6qn8x Күн бұрын

Good for checking the oxygen sensors too because they are providing feedback once the vacuum leak is fixed by the short term fuel trim going negative.

@joeyfogderud2858 4 жыл бұрын

08 Envoy 4.2, same code. I watched this video and I checked that same hose and guess what, that same hose was hanging off lol. Same problem. I just bought vehcile so previous owner left it undone.... I saved money as well, which is the best part!!!!!!!!!!

@wayne19703 Жыл бұрын

Fixed my 2004 silverado quick thnx to you. It was hose on passenger side valve cover going to intake ducting behind mass airflow..

@-MrRichBiker1967 6 жыл бұрын

Yo... You are an awesome mechanic,

@Savage7mileKilla 3 жыл бұрын

The shop probably left it like that on purpose to keep the person coming back spending money.... a lot of these shops don’t want you to have your car running right they greedy

@YH7R Жыл бұрын

Great detailed content GOD BLESS

@Gen01Lee 5 жыл бұрын

Thanks was exactly the problem.

@joaquinaguirre2976 2 жыл бұрын

Thank you so much! good video, I will do the test myself.

@Mime619 Жыл бұрын

Mine kept surging on start up to 3k rpms and slowly made its way down before stalling. Guys, don't go buy a smoke detector. I literally hooked up a hair dryer to duct and blew smoke into it. Plugged the other end next to it with a neoprene glove. Worked really well. I located the problem instantly. It was the resonator plug on the right with the metal strap. It was warped and put on wrong. $53 at the salvage yard for the new resonator.

@luisalejandrojorquera3177 4 жыл бұрын

Very good video thank you

@GaryW48 4 жыл бұрын

My 'Check Engine' light came on just tonight. In called OnStar and they gave me the same P0171 code. At least I know what to expect when I head in to see a mechanic in a couple of days, and not be fleeced for $$$.