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

Computer codes?

Thread Tools
 
Search this Thread
 
Old May 5, 2006 | 11:08 PM
  #1  
98 Mustang GT's Avatar
98 Mustang GT
Thread Starter
 
Joined: Apr 2006
Posts: 35
From:
Default Computer codes?

Hey everyone, as you can see Im a newbie on here. My mustang is having a slight idle problem. When I reach a stop the cars idle goes from 800rpm down to 600rpm and then goes back to 800rpm where it stays. I know there is a certain sensor somewhere on here that needs replacement. Is there any way to check computer codes on these cars through the ignition for example On/Off/On/Off or does that not even exist? PLEASE HELP THIS NEWBIE OUT
Old May 5, 2006 | 11:29 PM
  #2  
sprostang's Avatar
sprostang
I ♥ Acer
 
Joined: Sep 2005
Posts: 6,190
From: Illinois
Default RE: Computer codes?

Sounds like you need to clean the IAC. Heres what it looks like.

[IMG]local://upfiles/21900/A3073BDF45E8461582B34EA294F9A5A2.jpg[/IMG]
Old May 6, 2006 | 03:34 AM
  #3  
rbstang's Avatar
rbstang
6th Gear Member
 
Joined: Apr 2005
Posts: 5,608
From: Wilmington, NC
Default RE: Computer codes?

thats normal... your cooling fan draws energy which lowers the tach the engine revs a little higher so the fan can run.
Old May 6, 2006 | 03:50 AM
  #4  
St4ng07's Avatar
St4ng07
4th Gear Member
 
Joined: Mar 2006
Posts: 1,066
From:
Default RE: Computer codes?

Most likely your IAC or could be you MAS if you have a K&N Air filter take apart you MAS take a cue tip and electrolite cleaner and clean it off.
Old May 6, 2006 | 03:57 AM
  #5  
rbstang's Avatar
rbstang
6th Gear Member
 
Joined: Apr 2005
Posts: 5,608
From: Wilmington, NC
Default RE: Computer codes?

IAC deals with rpms hanging during shifts...
Old May 6, 2006 | 06:42 AM
  #6  
97targa's Avatar
97targa
5th Gear Member
 
Joined: Apr 2006
Posts: 3,625
Default RE: Computer codes?

It sounds like your fuel filter, not an engine code.
And no you need an OBD-II scanner. Auto parts store for $40...model specific
$149 for universal for any car
IT IS NOT YOUR AIC VALVE.....DON'T LISTEN TO THES IDIOTS.
Old May 6, 2006 | 12:10 PM
  #7  
SilverGTV8's Avatar
SilverGTV8
4th Gear Member
 
Joined: Aug 2003
Posts: 1,974
From: United States
Default RE: Computer codes?

Dude you are such a tool....

It is a known fact the the IAC causes a MOST of a mustangs idle issue.

It is an easy thing to pull off and clean up to see if it resolves the problem. It is always a good idea to replace the fuel filter after 30k.

But the fuel filter HAS NOTHING TO DO WITH THE SYMPTONS THE CAR HAS! If he came on and said the car is sluggish under acceleration, feels like it has a miss etc. Then it could possibly be a filter. IAC is usually the culprit fow what he is describing. Pull it clean it up and see if that resolves the problem.

It would also help to know what year the car is (it may not be OBD-2 Mr Brain......) auto or stick, when it does this do you have any of the HVAC controls on? If so what position?
The AC compressor when it kicks over can put a strain on the motor and will be more noticable in an Auto.



ORIGINAL: 97targa

It sounds like your fuel filter, not an engine code.
And no you need an OBD-II scanner. Auto parts store for $40...model specific
$149 for universal for any car
IT IS NOT YOUR AIC VALVE.....DON'T LISTEN TO THES IDIOTS.
Old May 7, 2006 | 12:55 AM
  #8  
rbstang's Avatar
rbstang
6th Gear Member
 
Joined: Apr 2005
Posts: 5,608
From: Wilmington, NC
Default RE: Computer codes?

your having an idle problem cuz of the fuel filter ROFL !!!!!!!!!!!!!!!!!!!!!!!! thats funny

but ya. like silver said HVAC and also the cooling fan like i said draw energy from the engy which causes the engine to go down a little bit then go back up. You can clean your IAC but i bet it will keep doing it because its normal...
Old May 8, 2006 | 03:15 AM
  #9  
98 Mustang GT's Avatar
98 Mustang GT
Thread Starter
 
Joined: Apr 2006
Posts: 35
From:
Default RE: Computer codes?

Looks like two 10mm bolts and that will come easy right? What should I use to clean that sucker? I appreciate all you gurus who are on here helping me out. BTW it is a 98(like the name says) and its a stick!!
Old May 8, 2006 | 03:19 AM
  #10  
St4ng07's Avatar
St4ng07
4th Gear Member
 
Joined: Mar 2006
Posts: 1,066
From:
Default RE: Computer codes?

????
And no you need an OBD-II scanner. Auto parts store for $40
Are you positive its only 40$



All times are GMT -5. The time now is 11:42 PM.