Question about Ford Taurus
When I first start my 2002 Ford Taurus, it idles really high, at about 2000 rpm. After I accelerate it goes back to normal. Sometimes, not all the time, when I am attempting to stop the rmps will stay around 1400 and i have to change gears to neutral for it to go back down. Also, my car does not decelerate upon letting off of the gas. My car is NOT putting out any codes at all. I've heard this was due to a faulty aftermarket iac, but I am completely unsure. I don't want to spend the money on something that will not work.
Forget the repair costs
You either want to resolve the issue or you don't
You need a shop to do that
You can try cleaning the IAC ,but after 12 years I would replace it,
only after I tested it,that takes professional software
Posted on May 11, 2014
Testimonial: "Its not that the IAC is old. I got the car last year and when i looked under the hood I saw the IAC was new."
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Posted on Jan 02, 2017
IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.
Posted on Sep 21, 2008
The PCM controls idle speed to ensure good driveability. The PCM will only attempt to maintain the desired idle speed when it “knows” the throttle is closed. A throttle switch or the TPS input is used to determine when the throttle is in the idle position. Motors and solenoids are used by most PCM’s to control idle speed. Many PCM’s are programmed to attempt to control the idle speed by adjusting spark timing and then by controlling the idle speed actuator. Some computers of the early 80's did not control idle speed.
Posted on Oct 19, 2008
SOURCE: Idles bad
Sounds like you may have an upper intake manifold leak. Typically the gasket between the Plenum and the lower intake dries up and gets sucked into the intake a little causing a leak and a high idle issue. The repair requires the removal of the plenum and replacement of the gasket. NOTE: there is a torx bolt hidden between the center plenum runners and can only be seen by looking straight down at the top of the plenum and it may be covered in dirt. If you have to use a bar to pry off the plenum you probably have missed a bolt. Typically it is the one noted above. Best of luck.
Posted on Mar 22, 2009
you may have a tensioner or idler pulley starting to go bad. They make a high pitched whistle when the bearings are on thier way.
Simply have someone slowly bring it up to 2000 rpm and listen with the end of a wooden broom handle touching the center bolt on each. Be careful not to get caught.
If you're not used to this you may be able to hear it whithout use of the "hearing aid"
Your drive belt may simply need dressing. You can buy this at almost any auto parts store for about 4 bucks. (dont use anthing else as you will cause the belt to stretch creating more issues)
Posted on Jan 01, 2010
check or clean out throttle body at throttle plate it may have carbon build up on it. also make sure air filter is clean and check or replace the intake air tempurature sensor.(iat) sensor. the sensor is under 20.00, the sensor is after air filter in the big hose to throttle body.
Posted on Feb 15, 2010
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