The vehicle being worked on is a 2004 Chevy Suburban with a 5.3L engine. It had multiple trouble codes in memory P0171 and P0174 (fuel system too lean bank 1 and 2) a P0101 (MAF circuit out of range) and a P0300 (engine misfire detected). All of these were related to one single problem.

Engine Performance Diagnostics chapter 1 pages 412

Symptoms
rough idle, especially cold
check engine light (P0171, P0174, P0101, P0300)
poor gas mileage
hesitation on acceleration
runs much better with engine warm

Fix
replace intake manifold gasket

Tests shown
how to use freeze frame data to determine type of lean condition
how to interpret fuel trim data
how to locate a vacuum leak with water
how to smoke test and intake manifold
how to know what trouble codes to fix first

Tools used
scan tool
smoke machine
water bottle

Playlist
(Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing
   • (Chapters 4 and 5) Fuel Trim and Oxyg...  

Related videos
Understanding Short Term and Long Term Fuel Trim (an SD Premium video)    • Understanding Short Term and Long Ter...  
How to find a vacuum leak with water
   • How to find a vacuum leak with water  
Misfire caused by a vacuum leak
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Ford F150 P0171 P0174 Trouble Codes vacuum leak (water test)    • Ford F150 P0171 P0174 Trouble Codes ...  
Idle Speed Problems P0507 caused by a vacuum leak
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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.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/joinsc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better online training of how to troubleshoot automotive electrical and electronics systems anywhere!

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