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
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