idle problems (hanging,low) - Ford Mustang Forum
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post #1 of 4 (permalink) Old 01-16-2011 Thread Starter
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Joined: Oct 2007
Location: Arlington
Posts: 247
idle problems (hanging,low)

hey guys ive been having a lot of trouBle lately with my cars idle. everytime i would shift it would spike up, when in N it would hang at about 2k, 3k in cold weather VERY ANNOYING. so i changed the IAC, the TPS which i got at the ford dealership ($90:? and the egr. it continued to do it so i kept checking things. when the IAC is unplugged it almost dies which is how its suppose to be but when i plug it back in the idle shoots up to 1.5-2k so i put the old one back on and it stopped. no more hanging idle but now it idles kind of low 500-600 and it dies sometimes when i start it. should i just go try another IAC. a bunch of codes keep popping up and im not sure if its bcuz im messing with all this. P1504, P1506, P1120, P0122 AND P0136 but thats an o2 sensor thats bad HELP
2000 V6 176K

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post #2 of 4 (permalink) Old 01-16-2011
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First off address the codes that it is giving . If you have a bad )2 sensor it can affect your idle and drivibility. So if codes are happening that is where you need to start. The Iac circuit seems to say that you are reading higher then expected so could you have the TPS set a little too high whenyou changed it. It can be made to adjust and as I have said before I think it has a range of .5 volts to .9 volts when it is just sitting closed and will move upward from there when the trottle is opened. I know some have said the new cars use a different method of closed loop to reset this with each start, but maybe you should try and set this at the .5 volts when it is just closed and see if that helps. If it does make a difference but the way you want try moving it more to the .9 volts. This may well stop all those codes bu the O2sensor.

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post #3 of 4 (permalink) Old 01-16-2011 Thread Starter
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how exactly do i do that sir ive never done something like that. do you think its a good idea to get a new IAC it is pretty old.
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post #4 of 4 (permalink) Old 01-16-2011
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vacuum leaks are a leading cause of erratic idle speeds

2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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