Change in RPM's

2001 VOLVO S80
144,000 MILES
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TAHOE
  • MEMBER
  • 5 POSTS
When driving (mostly on freeway) RPM's jump back and forth 2000 to 2500. Car jumps a bit. I apply the same pressure to gas pedal, but rpms jump back and forth
Jan 18, 2012 at 10:07 PM
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RIVERMIKERAT
  • ✓ASE Certified Mechanic
  • 6,110 POSTS
  • ASE Certified Mechanic
Check for vacuum leaks and verify proper timing.
Jan 18, 2012 at 11:26 PM
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JIS001
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  • 3,412 POSTS
  • ASE Certified Mechanic
Is this a turbo engine? Also has the check engine light come on?
Jan 20, 2012 at 12:11 AM
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TAHOE
  • MEMBER
  • 5 POSTS
yes it is a turbo, Engine light came on for one day and then did not come on again
Jan 20, 2012 at 6:03 AM
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JIS001
  • ✓ASE Certified Mechanic
  • 3,412 POSTS
  • ASE Certified Mechanic
Have it scanned for fault codes to see what codes you are getting? If you are feeling a surge then you could be having an issue with the turbo control valve failing. Once they start to stick it will cause the vehicle to*****/surge while under load (accelerating). If it feels like you have no power then you would need to inspect the vacuum lines from the turbo control valve to the waste gate. If the hose or "T" valve is broken it would be better to replace the vacuum hose as an assembly. keep us posted please and post the fault codes if you can.
Jan 20, 2012 at 6:46 AM
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