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idle is loud & goes up & down--a problem??

Old 11-08-2007, 12:17 PM
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Location: Aurora, IL
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Default idle is loud & goes up & down--a problem??

When I get home from work or get to work after about a 30-minute drive on the highway, I'll pull into my spot, and if I just sit there for a minute, the tach needle will rev up and down, and a lot higher than it used to. It's pretty loud and the needle doesn't just move a little--it really goes UP and DOWN. I'm totally guessing here, but maybe like 150-200 RPM from low to high and down again. Is something not right here? If so, what might it be? Thanks.
Old 11-09-2007, 04:36 AM
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Default RE: idle is loud & goes up & down--a problem??

Search: Idle Surge Issues

Its a thread I started when I was going through the same thing. Tons of troubleshooting info there.

Good luck!
Old 11-10-2007, 05:11 PM
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Location: Harleysville, PA
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Default RE: idle is loud & goes up & down--a problem??

Idle Air Control Valve (IACV).

Unbolt it, clean the screen, and enjoy your nice idle.
Old 03-31-2008, 02:06 AM
Join Date: Mar 2008
Posts: 47
Default RE: idle is loud & goes up & down--a problem??


thats not my case i have done that i found out its my FIV its cloged and its stuck open when i plug the lower port it stops im going to clean it when it gets light out and then let everyone know if that fixed it
Old 04-02-2008, 03:09 PM
Join Date: Apr 2008
Posts: 1
Default RE: idle is loud & goes up & down--a problem??

i have the same problem...also heard it is the throttle posistion sensor....i will try cleanin the idle crontrol valve, id love to enjoy a smooth idle....
Old 04-02-2008, 05:17 PM
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Posts: 164
Default RE: idle is loud & goes up & down--a problem??

My idle was doing the same thing a few days ago. Shortly after, I had disconnected the battery to change the fuel filter. Ever since then, the idle surge has been gone. I guess resetting the ECU (if that's what happened) did the trick. Not saying that's your problem. Just saying... lol

Good luck, man.
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