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Speed increases on its own

Tiny
JERRY98
  • MEMBER
  • 2003 BUICK CENTURY
  • 58,000 MILES
What would cause my car's speed to increase after I let off the gas? The car runs fine other then that, I cleaned the throttle plate, and poured techron in the tank, checked vacuum hoses. The car has no trouble codes. The problem seems to be increasing. It doesnt happen all the time, but more often now I noticed the speed slowly increases instead of decreasing after I let off the gas. I'm usually going between 30-40 mph when I notice this, I occasionaly have a high then normal idle at start up also. Any idea's?
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Tuesday, April 17th, 2012 AT 11:15 PM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Is the return spring on the throttle properly installed?
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Tuesday, April 17th, 2012 AT 11:29 PM
Tiny
JERRY98
  • MEMBER
  • 6 POSTS
From what I can tell the spring is properly installed and original and seems to work ok by hand, the only work that has been done around the throttle body according to records was a canister purge control solenoid valve replaced back in 07.
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Tuesday, April 17th, 2012 AT 11:49 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
So you can open the throttle by hand and watch it snap back closed? Have you had it scanned for soft codes. These won't set the CEL, and don't show up on all scanners. And you have to let them know you want to know about soft codes.
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Wednesday, April 18th, 2012 AT 12:14 AM

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