Vacuum Leak causing surging idle?

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Mar 5, 2013 | 06:41 PM

#21

poorman212

Super Moderator

Joined: May 2010

Posts: 11,834

From: Kenton, TN

So....is the idle better now?

Mar 6, 2013 | 09:15 AM

#22

Brandon Saunders

Thread Starter

Newest Of Newbies

Joined: Jun 2012

Posts: 26

From: Hesperia, CA 92345

Yes!!

So the idle is a whole lot better. It stars up at like 1200 and will wind its way down to about 900 in park. And in drive it sits at 900 when i'm idling. If I hit the gas too much in Park or neutral it will do the surging idle but that's ok. I tightened the locking nuts near the spring and control arm. It's a bit tight so I'm going to loosen it up bit by bit. Thank you again.

Oct 4, 2021 | 06:35 AM

#23

Sain1979

Joined: Oct 2021

Posts: 1

Vacation leak

Quote:

Originally Posted by Brandon Saunders

So I've been working on the surging idle for over a week and a half now reading all the forum posts etc...
So far I've:
Cleaned/Replaced IACV, FITV, Air boost valve, cleaned the TB, changed air filter, changed spark plugs, checked for vacuum leak, put techron fuel injection cleaner in, and put a new fuel filter in. So now I pulled the Vacuum Control Box off to check the MAP sensor and I can't really figure it out.
Oh and it only does the surging idle from 1500 to 1000 RPMS in Park and Neutral. No code is thrown. Any more ideas and I would be much appreciative! Thank you all for reading!

I'm having the same issue have you tried the egr valve or the tps sensor.. you said you replaced the IACV you check the map sensor .. the map sensor and IACV work hand in hand if o e is not working properly or try doing idle relearn that is has to be done for sure... If i give any more ideas . Do this first its call idle relearn look it up anytime you do work around throttle it has to be done.