Vacuum leak causing lean codes

2004 CHEVROLET TAHOE
250,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
Avatar
922HONDA
  • MEMBER
  • 1 POST
Changed intake manifold gaskets code still came back. any idea?
Jun 16, 2017 at 8:47 AM
Advertisement
Avatar
MHPAUTOS
  • ✓Experienced 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.
Jun 16, 2017 at 5:20 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.