96 gt idling issues!! - MustangForums.com



4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-06-2012, 06:22 PM   #1
krivs399
Thread Starter
 
Join Date: Oct 2012
Location: Rhode Island
Posts: 2
Question 96 gt idling issues!!

Hey guys I'm looking for a little help. About 6 months ago I picked up my 5 speed 96 gt convertible. Since the day I got it, it has been idling very very weird. On a cold start it idles just above 2 grand and after it warms up it NEVER goes down under 1,000 rpms. It should idle around 750-800. Since I've had it I've changed the cat's, all 4 o2 sensors, spark plugs, plug wires, ignition coils, filter on the k&n air intake, throttle body, pcv, and some other odds and ends. And yet the car still idles funky. I even checked the throttle stop screw on the throttle body to see if it was holding the throttle open a little. The check engine also comes on and off and my scan tool gives me the code (p1131 ho2s11 snsr indicates lean). Having my car run like this isnt that big of a deal, but id just like to rectify the issues. I was just wondering if anyone had a similar issue before i start ripping everything apart. Any help would be greatly appreciated. Thanks!
krivs399 is offline   Reply With Quote
Old 10-06-2012, 07:01 PM   #2
07grabber4.0
2nd Gear Member
 
Join Date: Aug 2012
Location: Georgia
Posts: 228
Default

I'd go back and check over your work. You have done a lot to the engine so go back and check. Maybe one of them needs replacing. But ideling at 2k on a cold start is normal. Doesn't seem like a big issue though
07grabber4.0 is offline   Reply With Quote
Old 10-06-2012, 07:32 PM   #3
JC316
4th Gear Member
 
JC316's Avatar
 
Join Date: May 2009
Location: DFW, TX
Posts: 1,925
Default

Check the IAC valve for sure. Lean could indicate a vacuum leak and a large enough one can cause high idle.
JC316 is offline   Reply With Quote
Old 10-06-2012, 10:30 PM   #4
caaraa
2nd Gear Member
 
Join Date: Apr 2011
Location: new york
Posts: 178
Default

I'm awesome like that!

caaraa is offline   Reply With Quote
Old 10-06-2012, 10:43 PM   #5
96Supedupstang
 
Join Date: Aug 2012
Location: Michigan
Posts: 17
Default

After warming up your idle should come down, like they said above check your vacuum lines first. If they come back good you may need to get your PCM re-flashed (if you want a stock tune), any ford dealer will do this for a high fee. The person may have bought a tuner for it, and that may have messed something up if they didn't up load their tunes right. If the problem is your computer, you may want to look into getting a tune for yourself, it'll be sort-of close to the cost to get it re-flashed, here in Michigan they want about $150 for it.
96Supedupstang is offline   Reply With Quote
Old 10-07-2012, 01:43 PM   #6
krivs399
Thread Starter
 
Join Date: Oct 2012
Location: Rhode Island
Posts: 2
Default

The car had idling issues befote i added all the aftermarket parts. I forgot to mention i installed a new TPS also. I kno idling at 2k on a cold start is normal but its gone up to 23-2400 at times too. If the idle air control valve wasnt so expensive id just buy it. But theres no returns on electronic parts so i dont want to buy it and have it not fix the issue. I was also thinking that the mass air flow might have some issues. Have any of you guys got that same trouble code? It says snsr indicates lean but doesnt say which sensor.
krivs399 is offline   Reply With Quote
Old 10-07-2012, 01:52 PM   #7
JC316
4th Gear Member
 
JC316's Avatar
 
Join Date: May 2009
Location: DFW, TX
Posts: 1,925
Default

Quote:
Originally Posted by krivs399 View Post
The car had idling issues befote i added all the aftermarket parts. I forgot to mention i installed a new TPS also. I kno idling at 2k on a cold start is normal but its gone up to 23-2400 at times too. If the idle air control valve wasnt so expensive id just buy it. But theres no returns on electronic parts so i dont want to buy it and have it not fix the issue. I was also thinking that the mass air flow might have some issues. Have any of you guys got that same trouble code? It says snsr indicates lean but doesnt say which sensor.
Trust me man, check for vacuum leaks and if you don't find any, then it's the IAC valve. Hell, just take it off and clean it, most of the time that fixes it. That or fire the car up and when it wont idle right, take the handle of a screwdriver and hit the IAC a few times, it should drop.
JC316 is offline   Reply With Quote
Old 10-08-2012, 07:21 PM   #8
swarthyfellow
3rd Gear Member
 
Join Date: May 2008
Location: NH
Posts: 568
Default

I have found that you usually don't need to take it off (IAC valve) just spry some carb cleaner in it and let it sit a bit. Start the car and hit it again but not allot when its running. After that hit it with some WD-40 and it should be good. You may have to do it a few times. I did that to mine and I haven't had any problems over a year and 20K miles.
You also might want to try running some fuel system cleaner. That seems to help out my idle.
swarthyfellow is offline   Reply With Quote
Old 10-08-2012, 07:57 PM   #9
uberstang1
Chupacabra
 
uberstang1's Avatar
 
Join Date: Jul 2004
Location: wilkes-barre PA
Posts: 9,612
Default

get a vacum gauge and verify vacum pressure.
uberstang1 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Spark Plug Change 2007StangV6 2005-2014 Mustangs 30 01-28-2016 06:09 PM
1996 GT Studdering problems.. Need Help stangin1996gt 4.6L (1996-2004 Modular) Mustang 0 09-21-2015 11:01 AM
1965 Straight 6 Automatic Transmission Torque Converter Issue LivingInThePast Classic Mustangs (Tech) 2 09-16-2015 12:20 PM
High idle after cleaning Imrc Scottyboy187 SVT Forums 1 09-13-2015 10:23 PM
03 V6 Mustang Ticking Noise Emblazoned General Tech 0 09-03-2015 10:45 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 11:55 AM.