Vacuum leak causing lean codes

Tiny
922HONDA
  • MEMBER
  • 2004 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
Changed intake manifold gaskets code still came back. Any idea?
Friday, June 16th, 2017 AT 3:47 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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.
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Saturday, June 17th, 2017 AT 12:20 AM

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