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1999 Chevy Suburban turbocharger

Tiny
ROSSPARKINSON
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
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?
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Saturday, June 6th, 2009 AT 9:05 AM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
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.
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Saturday, June 6th, 2009 AT 9:09 AM
Tiny
ROSSPARKINSON
  • MEMBER
  • 7 POSTS
Thanks I'll try it.
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Saturday, June 6th, 2009 AT 11:45 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Wastegates on these are electronicaly controlled, but mechanical moving wastgate to adjust boost.
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Sunday, June 7th, 2009 AT 7:42 AM

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