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Change in RPM's

Tiny
TAHOE
  • MEMBER
  • 2001 VOLVO S80
  • 144,000 MILES
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
Wednesday, January 18th, 2012 AT 10:07 PM

4 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check for vacuum leaks and verify proper timing.
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Wednesday, January 18th, 2012 AT 11:26 PM
Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
Is this a turbo engine? Also has the check engine light come on?
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Friday, January 20th, 2012 AT 12:11 AM
Tiny
TAHOE
  • MEMBER
  • 5 POSTS
Yes it is a turbo, Engine light came on for one day and then did not come on again
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Friday, January 20th, 2012 AT 6:03 AM
Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
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.
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Friday, January 20th, 2012 AT 6:46 AM

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