V6 mustang revving high

Discussion in 'SN95 V6 Mustang Tech' started by yaboy4life93, Mar 29, 2013.


  1. yaboy4life93

    yaboy4life93 Member

    Joined:
    Jul 11, 2011
    Messages:
    51
    Likes Received:
    0
    Trophy Points:
    7
    Hi, I have a 2001 v6 mustang with 134,500 miles on it. My car has recently started revving high when I cold start it. When the oil is at normal operating temp it revvs high as well. The car accelerates at a red light, and I have to really mash the brakes to keep it haulted. I cleaned my throttle body, and I sprayed wd-40 in my IAC; it still revvs high. I also checked for air leaks. I don't think there are any because I don't hear any high pitched whistling. Any idea?
    #1
  2. jhooks320

    jhooks320 New Member

    Joined:
    Jan 12, 2013
    Messages:
    21
    Likes Received:
    0
    Trophy Points:
    2
    I am having the same exact problem. Try unplugging the IAC while its running and see if the idle goes down. Thats what my mechanic did and he told me that because the idle went down, the IAC was bad. Ordered the part and will receive it on wednesday. ill be sure to repost my results.
    #2
  3. JB04v6

    JB04v6 Member

    Joined:
    Mar 14, 2013
    Messages:
    45
    Albums:
    2
    Likes Received:
    0
    Trophy Points:
    6
    whistle need not be present, starting fluid sprayed around hose connections works best for me. immediate ansewer if leaking
    #3
  4. jhooks320

    jhooks320 New Member

    Joined:
    Jan 12, 2013
    Messages:
    21
    Likes Received:
    0
    Trophy Points:
    2
    Mine turned out to be the TPS.. Still idles a little rough on startup but not at 2500rpm lol
    #4
  5. yaboy4life93

    yaboy4life93 Member

    Joined:
    Jul 11, 2011
    Messages:
    51
    Likes Received:
    0
    Trophy Points:
    7
    That is pretty fortunate. I am stuck between the tps and the iac. You changed the iac, right? How did you figure out it was the TPS? And my car sort of selectively revs high all of a sudden, so I am going to make a new gasket for my IAC and see what happens. Make sure you change your gaasket, that might help with your rough starts.
    #5
  6. jhooks320

    jhooks320 New Member

    Joined:
    Jan 12, 2013
    Messages:
    21
    Likes Received:
    0
    Trophy Points:
    2
    Yes I changed the iac because it threw a malfunction code. The tps is what fixed the problem. Run to advance auto or autozone and have them check or codes. Even though there's no light that doesn't mean there isn't a code. If you can't have it checked try n replace the tps first since its cheaper
    #6
  7. yaboy4life93

    yaboy4life93 Member

    Joined:
    Jul 11, 2011
    Messages:
    51
    Likes Received:
    0
    Trophy Points:
    7
    I took it to autozone and both codes came up. These past few days however, it hasn't been a problem; that being the revving. So if it happens again I think I am going to start with a cereal box gasket for the IAC. I can't imagine the IAC is going bad, it doesn't seem too intricate a piece of hardware. I think mine functions alright. Maybe the TPS. But for you, were your symptoms after changing the IAC, and before changing the TPS, cold starts with high revving accompanied by erratic jumps while driving or at a stoplight? Thanks.
    #7
  8. jhooks320

    jhooks320 New Member

    Joined:
    Jan 12, 2013
    Messages:
    21
    Likes Received:
    0
    Trophy Points:
    2
    It may not seem like it but if you look inside its basically a spring a post and a lever that opens and closes to control the amount of air passing through the engine at idle. If it sticks or malfunctions it will add more air than it needs and that in turn causes your car to add more fuel so that the car doesn't stall. It also could be a malfunction in the electrical circuit of the iac. But the tps is what fixed the random high idling. The surging at red lights on the other hand is the iac because like I said if it sticks your car will add more fuel thus causing the car to jerk forward. I would replace the tps first then if the problems persist change the iac.
    #8
  9. beeker69

    beeker69 Member

    Joined:
    Sep 7, 2013
    Messages:
    6
    Likes Received:
    1
    Trophy Points:
    14
    I know this is an old thread but I have found spraying some seafoam deep creep into the iac and then flushing it with brake cleaner works for me.
    #9

Share This Page