Link to part 2 (the follow up) • Multiple Problems/Poor...
2007 Chevy Suburban 5.3L with lean conditions from a fuel pressure issue and a vacuum leak, a dirty throttle body causing false TPS code P0121, and a charging system issue. If you are not careful with a job like this, it can end up costing you money.
Symptoms:
Long crank time, low power, backfiring through the intake, stalling, battery light on
:40 symptoms and customer complaint
2:18 what I think the problems are
3:36 code list and freeze frame data
5:05 long crank time
5:30 fuel trim data and O2 analysis
7:14 test drive to look at O2 at WOT
9:17 backfiring though the intake
9:33 forced open loop condition, fixed lean O2, how to test the O2 during this condition (do we have a mixture problem or O2 problem)
11:09 checking fuel pump current with a lab scope #uTestTerminalKit #AESwave
14:30 fuel pressure testing
17:15 addressing idle lean condition and TPS code
20:33 fuel pressure spec
23:35 fixing the TPS code/identifying and cleaning a dirty throttle body
29:14 reviewing the conditions and what we found with my brother
32:20 checking for a vacuum leak
33:05 why communication is the key
34:19 fuel psi dropped 2 psi when fans came on
35:10 idle relearn procedure
37:05 why it ran better in closed loop and after the codes were cleared
ScannerDanner Tools:
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working 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 video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this 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 in this video is the sole responsibility of the user and not ScannerDanner LLC.
14 янв 2022
