Vacuum

2005 GMC ENVOY
150,000 MILES • V8 • 4WD • AUTOMATIC
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RNDYMN
  • MEMBER
  • 1 POST
Can a vacuum problem cause 4wd not to engage and ignition not to function some times ( crank shaft position )
Jan 31, 2016 at 1:16 PM
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CATAFINA
  • ✓ASE Certified Mechanic
  • 167 POSTS
  • ASE Certified Mechanic
If its not starting up could be the crankshaft position sensor, for the vacuum I doubt it on the 4WD
Jan 31, 2016 at 2:51 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
make sure your anit theft isn't engaged for no start. if no manual look online
Feb 1, 2016 at 7:07 AM
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