whats wrong w/ my car?

souless7 · 12-20-2007, 06:19 PM

hello. my 99 gt isn't idling correctly. its all over the place. after its been running a bit, the needle dips down to below 500 rpms. carmax said they can't find anything wrong with it. any ideas?

WaterDR · 12-20-2007, 06:30 PM

Could be a lot of things, but seems like you have the dreaded "hunting" idle. What mods are done to the car? You could have an after market throttle-body that is not set right or a CAI that is messing things up.

Tell me more....

SxyXc · 12-20-2007, 07:41 PM

could it? also be the IAC if its a stock car??

flyinfox · 12-20-2007, 08:12 PM

iac [idle air controll] thats probly what it is

WaterDR · 12-20-2007, 09:48 PM

IAC is a likely candidate.

*03gtmustang* · 12-21-2007, 12:45 AM

Wouldnt assume anything until we know whats done to the car.

souless7 · 12-21-2007, 07:53 AM

The car is completely stock. carmax fixed the idle control when i first got the car. that was the first thing they checked when i brought it in the other day. said they couldnt find anything wrong

*Randy Stinchcomb* · 12-21-2007, 08:13 AM

chances are it is an IAC problem and most IAC problems can be from not changing the PCV valve at the normal 30k intervals, or the use of and "aftermarket" IAC or both.......how many miles on the car?

souless7 · 12-21-2007, 04:46 PM

it has around 78k. do you think changing the pcv valve would fix it or should i go ahead and get another shop to inspect the idle control

TrippiGT · 12-23-2007, 07:28 PM

I have the same problem with my car. Its so bad it will even die on me when its trying to idle. I have 100K miles and a BBK CAI. The intake was on the car when I got it and it's always had that problem. Would replacing the PCV valve probably fix this problem? And how much would that cost? I've never priced those.

*Randy Stinchcomb* · 12-24-2007, 05:24 AM

Id replace both the IAC (@$70.00) and the PCV valve (@$6.00 to $12.00)....PCV valves should be changed every 30k under "normal" driving conditions, also inspect the rubber hose going from the PCV valve to the plenum for cracks or holes......

cre8787 · 12-24-2007, 08:12 AM

I had the same problem with my old 2000 GT. I had no mods with about 75,000 miles... turned out to be the IAC. It would drop RPMs and die a lot. I put a new IAC in and everything was fine.

jcsuli74 · 01-02-2008, 02:41 PM

Quote:

Originally Posted by cre8787

I had the same problem with my old 2000 GT. I had no mods with about 75,000 miles... turned out to be the IAC. It would drop RPMs and die a lot. I put a new IAC in and everything was fine.

+1 i had a 01 and the iac went out and the damn thing wouldnt stay started unless you held it about 3000 rpm.

i'd take it somewhere else. hell around here the ford dealerships and the "discount" guys are almost the same damn price.

StormsGT · 01-03-2008, 06:09 AM

Could just be an air leak after the MAS.

bullitt1222 · 01-14-2008, 10:08 PM

i agree with stromsgt, i just had this problem, and it was a leak in my intake.

12-20-2007, 06:19 PM	#1 (permalink)
souless7 Member Join Date: Jul 2006 Posts: 47	whats wrong w/ my car? hello. my 99 gt isn't idling correctly. its all over the place. after its been running a bit, the needle dips down to below 500 rpms. carmax said they can't find anything wrong with it. any ideas?

12-20-2007, 06:30 PM	#2 (permalink)
WaterDR Administrator Join Date: Sep 2004 Posts: 6,370	Could be a lot of things, but seems like you have the dreaded "hunting" idle. What mods are done to the car? You could have an after market throttle-body that is not set right or a CAI that is messing things up. Tell me more.... __________________ Black 2000 GT Vert: Novi-2000 with Intercooler (375rwhp @ 9 psi); Tune by Kauffmans; Roush 380R Body kit; Steeda Subframes; Steeda Strut Tower Support; Deep Dish Bullets; FRPP 4:10's; SCT 4 Position Chip with four custom tunes; Steeda CAI; C&L Pleum; BBK 75 TB; SLP Loudmouth; SLP Catted X-Pipe; Bullitt Suspension; UPR Conrol Arms; Focus Fuel Pump My Car My Email

12-20-2007, 07:41 PM	#3 (permalink)
SxyXc Senior Member Join Date: Dec 2006 Location: Texas Posts: 680	could it? also be the IAC if its a stock car?? __________________ Racing from a roll is just like masturbating, no matter how good you think you are, it is still not the real thing!

12-20-2007, 08:12 PM	#4 (permalink)
flyinfox go on3 Join Date: Nov 2005 Location: Missouri Posts: 384	iac [idle air controll] thats probly what it is __________________ 02 sonic blue KB gt 610hp 598 tq mods 2.6 kb 18 lbs motor broke in new tune New numbers more boost 714Hp 732Tq 2.6 23lbs stage 3 crower cams 4.30's it blew up once but it is alive again http://www.mpsautosalvage.com/parting/index.cfm

12-20-2007, 09:48 PM	#5 (permalink)
WaterDR Administrator Join Date: Sep 2004 Posts: 6,370	IAC is a likely candidate. __________________ Black 2000 GT Vert: Novi-2000 with Intercooler (375rwhp @ 9 psi); Tune by Kauffmans; Roush 380R Body kit; Steeda Subframes; Steeda Strut Tower Support; Deep Dish Bullets; FRPP 4:10's; SCT 4 Position Chip with four custom tunes; Steeda CAI; C&L Pleum; BBK 75 TB; SLP Loudmouth; SLP Catted X-Pipe; Bullitt Suspension; UPR Conrol Arms; Focus Fuel Pump My Car My Email

12-21-2007, 12:45 AM	#6 (permalink)
03gtmustang Super Moderator Join Date: Jan 2005 Location: Northern Va Posts: 3,241	Wouldnt assume anything until we know whats done to the car. __________________ D&D Auto Detailing -Dan

12-21-2007, 07:53 AM	#7 (permalink)
souless7 Member Join Date: Jul 2006 Posts: 47	The car is completely stock. carmax fixed the idle control when i first got the car. that was the first thing they checked when i brought it in the other day. said they couldnt find anything wrong

12-21-2007, 08:13 AM	#8 (permalink)
Randy Stinchcomb Super Moderator Join Date: Aug 2005 Location: Randallstown, Md Posts: 2,632	chances are it is an IAC problem and most IAC problems can be from not changing the PCV valve at the normal 30k intervals, or the use of and "aftermarket" IAC or both.......how many miles on the car? __________________ Randy Stinchcomb contact info: Liberty Ford of Baltimore 410-655-2000 parts ext 5618 like to fish visit us at www.sportfisherman.com need fishing tackle www.binnacletackle.com

12-21-2007, 04:46 PM	#9 (permalink)
souless7 Member Join Date: Jul 2006 Posts: 47	it has around 78k. do you think changing the pcv valve would fix it or should i go ahead and get another shop to inspect the idle control

12-23-2007, 07:28 PM	#10 (permalink)
TrippiGT Junior Member Join Date: Sep 2007 Posts: 11	I have the same problem with my car. Its so bad it will even die on me when its trying to idle. I have 100K miles and a BBK CAI. The intake was on the car when I got it and it's always had that problem. Would replacing the PCV valve probably fix this problem? And how much would that cost? I've never priced those.

12-24-2007, 05:24 AM	#11 (permalink)
Randy Stinchcomb Super Moderator Join Date: Aug 2005 Location: Randallstown, Md Posts: 2,632	Id replace both the IAC (@$70.00) and the PCV valve (@$6.00 to $12.00)....PCV valves should be changed every 30k under "normal" driving conditions, also inspect the rubber hose going from the PCV valve to the plenum for cracks or holes...... __________________ Randy Stinchcomb contact info: Liberty Ford of Baltimore 410-655-2000 parts ext 5618 like to fish visit us at www.sportfisherman.com need fishing tackle www.binnacletackle.com

12-24-2007, 08:12 AM	#12 (permalink)
cre8787 Senior Member Join Date: Apr 2007 Location: Maryland Posts: 158	I had the same problem with my old 2000 GT. I had no mods with about 75,000 miles... turned out to be the IAC. It would drop RPMs and die a lot. I put a new IAC in and everything was fine. __________________ 2003 Azure Blue Mach 1- M112 Eaton Supercharger (Stock Pullies/Unported/Stock Bottem End/Stock Heat Exchanger/Cobra Tank and Pumps), 4.10's, SCT Custom Tunned by Excessive Motorsports, SLP 2 w/ Mac Catted H, H&R Sport Springs (Uninstalled), BFG KDW2 295's. Dyno Numbers- 442.31hp and 386.03tq Track Numbers- 13.014 @ 115.45 w/ 2.200 60ft (Track Wet) Progress Pictures: http://s28.photobucket.com/albums/c2.../Eaton%20Swap/

01-03-2008, 06:09 AM	#14 (permalink)
StormsGT 1320 Number of the beast Join Date: Sep 2004 Location: Hope IN Posts: 1,160	Could just be an air leak after the MAS. __________________ [IMG]StormsGT, Should be stormscobra now. #3216 BBK Cold air kit, BBK underdrives, Steeda sub frame connectors,BBK progressive springs,Hurst billet plus shifter,Auto meter shift light,Steeda UCA'sand Lakewood LCA's BBK 62mm T.B.17X9 With 255/40sumitomo HTR Z's,17X10.5 with 315/35 sumitomo HTR Z's or 315/35 BFG G-Force DR's depends on the time of year.Dr. Gas O/R X-pipe and 2 1/2" Flow's with Flowmaster 40's and dumps.FRPP 4.10's.The other toy is a 72' Nova. Small block,4-speed & 10 bolt

01-14-2008, 10:08 PM	#15 (permalink)
bullitt1222 Junior Member Join Date: Jan 2008 Posts: 12	i agree with stromsgt, i just had this problem, and it was a leak in my intake.

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