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Taurus vacuum diagram

2002 ford taurus dohc high idle when car goes over 1800rpm, when slowing down or stopping car stays accelerated then drops to 200rpm before hitting normal. replaced iac twice, checked for vaccum leaks with smoke test and propane test but no leaks found under the hood. where else can i check or have a possible solution

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  • Contributor
  • 40 Answers

It would usually be the tps (throttle positioning sensor) but you can also check the icv (idle control valve)

Posted on Dec 31, 2013

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 2002 Ford Taurus ses 24v DOHC

Sounds like when you ran the car out of gas the fuel pump was damaged, these in tank electric fuel pumps are very small and produce allot pressure and volume, the way they do this is to use the gas around them to cool down, when the pump comes out of fuel when the tank is below 1/4 full it starts to get hot very quickly, since your pump was well used (109000 miles) that was the last straw. When you replace the pump also replace the fuel filter.
I would also clean the throttle valve and idle speed control valve, this may be contributing to the low idle complaint, clear the system after the pump and cleaning by disconnecting the battery for a few moments.

Posted on Sep 09, 2008

  • 3 Answers

SOURCE: Car idles too high and dies

The later 80's accords have a problem with idling being to high at start up, even when the ambient air temp does not warrant it. I have had a 86 and now an 87 accord and both did that. I pretty much deal with it, being as you cant hardly replace indiv carb parts. Adjusting the idle will do nothing to stop it either. I took my 86 to a shop when I still had it and he fixed it, but I cant remember what all he did. I know he drilled a couple small holes in the choke plate. I think that the thermowax valve is bad, but again, you cannot find just a thermowax valve or anybody who knows what it is. Replacement carb in my area is about $450. Like I said, you might just have to learn to live with a high idle at start up.

Posted on Sep 23, 2008

  • 150 Answers

SOURCE: idle at 1500 to 2000 rpm

Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.

Posted on Feb 12, 2009

  • 57 Answers

SOURCE: My 2002 Ford Taurus will shutter and die when

the idle air control valve is responsible for engine idle.
this is a common failure on ford's. but I don't think yours is bad because it does idle high befor it dies.
you stated you had codes p0171 and p0174 these are lean codes for bank one and two, you said you found a vacuum leak and repaired it, the vacuum leak was mostly likely the cause of the lean codes, however the pcm has calibrated the fueling stategy for this lean mixture, what you need to do is erase the KAM "keep alive memory" this is done by unhooking the negative battery cable for 60 seconds, this is the only way to erase the KAM the $6000.00 machine I use wont even do it.

once the KAM is clean the computer will go into a relearn state and all operating values will be adjusted for the vehicles current condition, during this relearn session the vehicle may have some driveability issues (low or high idle, stalling, poor fuel economy) the relearn should complete within 10 minutes of idling and then 10 minutes of driving.

good luck and keep me updated

wesleyschacht@hotmail.com

Posted on Jun 14, 2009

  • 1 Answer

SOURCE: 2002 Ford Taurus SEL, DOHC Misfiring

Disconnect the battery completely, try turning the key with the battery disconnected. Put the battery back together. The check engine light should be off now..

Posted on Aug 15, 2010

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1 Answer

Why doesn't it drop down to idle when I stop?


Is it always idling high?? Or just when you accelerate?? If its running high all the time, suspect a vacuum leak( unplugged vaciuun hoses, intake manifold leak, etc.) If it only does it when you accelerate and it wont come back to idle, suspect a bad tps or something sticking and letting your throttle to stay open.

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Hi Mandy, Take the vehicle for a diagnostic scan. The problem may be a damaged vacuum hose or leakage from the ducting between the intake and the throttle body. A scan should help pin point the problem. Regards John

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Sometimes that's caused by a vacuum leak near the manifold area.

Sometimes air in the coolant will cause an idle problem. Air will keep the air temp sensor from sending proper info.
Hope this helps.

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The fuel pressure regulator is on the fuel rail..But it sounds like to me like a stuck idle air control or a vacuum leak..Look carefully at all the vacuum lines and make sure they are not broke or crimped..If it stuck idling high you can tap on the valve and the idle will come down

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Sounds like a bad Idle Air Motor or a vacuum leak somewhere in the manifold area. Can make the car search for an idle....

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check transmission fluid.change fuel filter and air filter.try changing up on where you buy gas .because bad gas causes problems.

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mcdevito75 here, Sounds like the idle speed motor, Ford is known for these idle speed motors going bad, in the later stages the car races like crazy. have your repair shop check this idle speed motor and change it.

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2 Answers

2002 Ford Taurus SEL, DOHC Misfiring


Disconnect the battery completely, try turning the key with the battery disconnected. Put the battery back together. The check engine light should be off now..

Jan 31, 2009 | 2002 Ford Taurus

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