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06-12-2015, 09:30 AM
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#1
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Join Date: Aug 2014
Location: Newton NJ
Posts: 23
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Idle Hangs
After installation of a full exhaust (LTs, Y pipe, Cat-Back) and a ported and polished throttle body, I have been having a wired idle issue:
If I am driving, push in the clutch, take it out of gear and roll, the rpms will drop to about 2k or so and it will slowly decrease until I stop rolling. Then the idle will return to normal. Also when shifting, the RPMs do not drop quickly so I end up waiting for the RPM to drop for rev matching on up-shifts. Any ideas on this one?
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2000 Camaro SS SLP
SLP Lid, TSP LTs, TSP Catted Y, SLP LM1, Koni SA 4/4, BMR Lowering Springs, Founders Performance LCAs and Panhard Bar.
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06-12-2015, 03:20 PM
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#2
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Join Date: May 2009
Location: Highland Mills, NY
Posts: 1,915
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Did you tune it after and is the throttle body closing all the way. I had to adjust my FAST out of the box to get my idle correct, was allowing to much air where they had the set screw
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2000 Camaro SS 610rwhp/570rwtq LS2 440, 12 bolt 3.73, tranzilla t56
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06-12-2015, 05:54 PM
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#3
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Join Date: Aug 2014
Location: Newton NJ
Posts: 23
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I have not tuned it yet. I thought that when it was ported and polished they set the idle screw to the right position. It seemed like it was closing all the way and the TPS sensor reads 0.
__________________
2000 Camaro SS SLP
SLP Lid, TSP LTs, TSP Catted Y, SLP LM1, Koni SA 4/4, BMR Lowering Springs, Founders Performance LCAs and Panhard Bar.
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06-13-2015, 11:21 AM
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#4
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,619
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TB may be hanging. See if you/someone else can look at a scantool while this happening to see if the TPS is hanging.
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1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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06-14-2015, 03:30 PM
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#5
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Join Date: Aug 2014
Location: Newton NJ
Posts: 23
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Yeah I'll look at that. I looked at it breifly on dash command the other day and didn't see any issue. Probably not the safest thing to do while driving. Haha.
How can I tell if the throttle blade needs to be adjusted? Doesn't it need to hit the bottom bump stop before the blade hits the inside of the TB?
__________________
2000 Camaro SS SLP
SLP Lid, TSP LTs, TSP Catted Y, SLP LM1, Koni SA 4/4, BMR Lowering Springs, Founders Performance LCAs and Panhard Bar.
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06-16-2015, 04:18 PM
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#6
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Join Date: May 2008
Location: East Brunswick
Posts: 517
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most likely from the extra airflow unless they over ported the tb or wildly mis adjusted the idle screw although that's usually not touched.
The intake trims will adapt to a certain extent but a tune would 100% take care of it.
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2000 ws6
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06-18-2015, 10:11 AM
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#7
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NJFBOA Supporting Sponsor
Join Date: Jun 2013
Location: Lindenwold, NJ
Posts: 159
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Who ported the throttle body?
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06-21-2015, 12:57 PM
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#8
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Join Date: Aug 2014
Location: Newton NJ
Posts: 23
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It was done by Potz Speed and Performance in Florida. Didn't come up with any bad information on them in my research.
__________________
2000 Camaro SS SLP
SLP Lid, TSP LTs, TSP Catted Y, SLP LM1, Koni SA 4/4, BMR Lowering Springs, Founders Performance LCAs and Panhard Bar.
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