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Unread 05-24-2006   #1 (permalink)
ARMAN1R is offline Rookie

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Exclamation Need some help! 1998 Mustang GT with an Idle Problem

I Have A 1998 Mustnag G.t (5 Speed) . I Have A Idle Problem.

When I Come To A Stop The Idle Goes From 1000 Rpm To 500 Rpm Then To 600 Rpm Its Like Going To Shut Off. Then Stops To 1000 Rpm It Does It Only When The Car Is Warm I've Changed The (iac) Then Air Contol Valve (acv) Same **** I Even Cleaned The Throttle Body With Carb Cleaner .. I Dont Know What It Is .. Help....... Any Hints You Guys Can Give Me .... Thanks
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Unread 05-25-2006   #2 (permalink)
BlueStreak03 is offline SHELBY GT 500 Member


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Try cleaning and/or replacing the idle air control valve.
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Unread 05-25-2006   #3 (permalink)
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Try cleaning your mass air flow sensor and your intake air temp sensor.
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Unread 05-25-2006   #4 (permalink)
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I Replaced Both Of Them Mass Air Flow Senors And The Idle Air Control .. Same. I Try To Reset The Computer By Turning Off The Battery. Nothing
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Unread 05-25-2006   #5 (permalink)
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Did you replace the spark plugs and wires.
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Unread 05-25-2006   #6 (permalink)
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i used to have the same problem, what fixed mine was re-adjusting the TPS. Hasnt done it ever since.
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Unread 05-27-2006   #7 (permalink)
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Can You Tell Me Were The (tps) Are Located ? If You Have Tips Or Pictures You Can Post Were I Can See And Follow .

Is It Something I Can Do It My Self Or I Have To Take It To Mechanic.


Thank You
Guys ..
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Unread 05-27-2006   #8 (permalink)
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Oh Buy The Way I Have Changed My Spark Plugs And Wires .. I Did My Tune Up . I Asked Friends They Say Fill Up 91 And Fuel Injection Cleners.
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Unread 05-27-2006   #9 (permalink)
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The TPS is the throttle position sensor. It's located on the side of the throttle body. It has a small wiring harness attached to it. At idle, it should read .93-.97 Volts DC. I don't remember precisely which wires you check the voltage on though. I'm pretty sure if you do a search on the site for that adjustment, the answer is here somewhere. Adjusting it is very simple, all you do is loosen the two screws that hold the TPS to the throttle body and rotate the TPS until you get the desired voltage. If you need to rotate it more than the existing screw holes will allow, just use a drill and elongate them slightly so you can adjust it a little more.
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Unread 05-27-2006   #10 (permalink)
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How About If Just Get A New One Its Going To Cost Me $30.00 Dollers
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Unread 05-27-2006   #11 (permalink)
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If you've replaced the OEM throttle body then a new TPS may not fix your problem. But if you want to waste $30 be my guest.
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Unread 05-27-2006   #12 (permalink)
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I Just Changed My (tps) I Hope Its Going To Change I Dont Fell A Big Diffence But Ill Tell In Time ...
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Unread 05-27-2006   #13 (permalink)
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Changing a part that isn't broken, simply out of adjustment, is not going to solve your problem.

Above and beyond being a waste of $$ .
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Unread 05-28-2006   #14 (permalink)
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Thats True Money But. But Paperchan365 Said That It Worked For Him. I Dont Mind Changing It .. See What I Dont Understand On My Mustang You Cant Adjust The Tps . It Didnt Cost Me Much It Was Only 30 Bucks That Was The Only Thing Was Left For Me To Change Was The Tps I Canged The Air Conrol Vaule , Mass Air Flow Senor And Now The Tps Which I Changed Today. Only Time Will Tell If Its Going To Work Or Not .. Hopefully It Works So I Can Be Done Over That Idle Crap .. See My Posting In Like 1 Day And Will See If Did Work Or Not If It Was Worth The 30 Bucks That I Put In.. Thanks
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Unread 05-28-2006   #15 (permalink)
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But you can adjust the TPS, I told you how to do it in an earlier reply. If the original wasn't sending the correct voltage because it wasn't set properly, don't expect a new one to fix the problem.
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