1999 Chevy Suburban turbocharger

1999 CHEVROLET SUBURBAN
Avatar
ROSSPARKINSON
  • MEMBER
  • 7 POSTS
Engine Mechanical problem
1999 Chevy Suburban 6.5L Four Wheel Drive Automatic 185000 miles

turbocharger not working. Accessory vacuum pump making "louder" knocking noise, and new knocking noise appears to have developed just behind turbocharger. Any common suggestions? Vacuum pump always starts to knock and must be replaced. Might be unrelated to Turbo?
Jun 6, 2009 at 9:05 AM
Advertisement
Avatar
MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
If you are not getting any boost, the wastegate must be completely open. This is probably mechanical (wastegate stuck open due to soot).

As long as turbo in not blowing blue smoke, the turbo itself should be OK.
Jun 6, 2009 at 9:09 AM
Avatar
ROSSPARKINSON
  • MEMBER
  • 7 POSTS
Thanks I'll try it.
Jun 6, 2009 at 11:45 AM
Avatar
MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
Wastegates on these are electronicaly controlled, but mechanical moving wastgate to adjust boost.
Jun 7, 2009 at 7:42 AM
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.