Vacuum leak causing lean codes

2004 CHEVROLET TAHOE
250,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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922HONDA
  • MEMBER
  • 1 POST
Changed intake manifold gaskets code still came back. any idea?
Jun 16, 2017 at 3:47 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
two ways of locating a vacuum leak, spray some brake clean carefully around the inlet and vacuum hoses if the leak is bad the engine will surge. the best method is a smoke machine, this pressurizes the induction with harmless smoke and you can see where the leaks are, many work shops have this equipment.
Jun 17, 2017 at 12:20 AM
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