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 4-12

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
   • Misfire caused by a vacuum leak  
- Ford F-150 P0171 P0174 Trouble Codes - vacuum leak (water test)    • Ford F-150 P0171 P0174 Trouble Codes ...  
- Idle Speed Problems P0507 caused by a vacuum leak
   • P0507 Idle Speed Performance Higher T...  

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/join-sc... 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 on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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