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2001 Toyota 4Runner Rough Idle when letting go of gas

Tiny
CHEF2511
  • MEMBER
  • 2001 TOYOTA 4RUNNER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 77,500 MILES
Hello,

The best way I can explain my question is when I'm traveling at speeds of about 30 mph or more and let go of the gas, the car feels like it's got a rough idle to it. I don't feel the rough idle while stepping on the gas, only when I let go of the gas peddle - as the car begins to slow down, it's idling rough. I'm wondering what could be causing this. I've had regular oil changes and tune ups. Thanks for any information, I really appreciate it!
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Sunday, March 9th, 2008 AT 4:11 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the idle air control valve/throttle position sensor and EGR valve checked-also the fuel pressure with and w/o the fuel pressure regulator. Meaning vacuum and No vacuum-
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Sunday, March 9th, 2008 AT 4:17 PM
Tiny
CHEF2511
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  • 7 POSTS
Thank you so much rasmataz! I'm wondering if this is considered a "major problem" that requires immediate attention or can I wait several days to a week? What are the consequences of waiting to have it repaired - if any? Would you know approx how much this would cost to repair? If it turns out to be a valve issue, is it just replacement of the affected valve?
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Sunday, March 9th, 2008 AT 5:09 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The valves issue could just mean-opening it up and cleaning it out. I really dunno how much it would cost for the repair, as for labor/parts it varies with location.

Waiting for repairs-its gonna eat fuel like nobody's business. Just get it checked out-
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Monday, March 10th, 2008 AT 5:21 AM
Tiny
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  • MEMBER
  • 7 POSTS
IT turned out to be the u-joints for both front & rear drive shaft - needs replacement -does this sound right for 2001 40runner with 78K miles? Thx!
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Wednesday, March 12th, 2008 AT 3:10 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Its an engine performance problem -the driveline/ U Joints has nothing to do with a rough idle-
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Wednesday, March 12th, 2008 AT 4:55 PM

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