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Old 03-30-2005, 21:01   #1 (permalink)
JJ
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2000 taurus idle problem

I have a 2000 Ford Taurus with the FFV engine. I have been having
problems for a while when the car is at idle speed. At times it will
idle low 400-600 rpms and knock off. At other times, I can crank it
up, and it idles fine (600-800 rpm). I read another post suggesting the
IAC valve may need to be replaced. I looked up how to locate/remove it
in an aftermarket repair manual, and it suggested testing the voltage
coming into the valve from the PCM. The manual stated that I should
expect 10.5 - 12V with the ignition on. I measured about 2V. The
manual does not go into other steps to perform if the voltage is low.
Does this mean I have a bad PCM, or are there other steps I should take
to rule out other problems?

Thanks,
JJ

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Old 03-30-2005, 22:01   #2 (permalink)
gerald smith@impco.com
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Re: 2000 taurus idle problem

On 30 Mar 2005 20:11:33 -0800, "JJ" <jjfarrell@earthlink.net> wrote:

>I have a 2000 Ford Taurus with the FFV engine. I have been having
>problems for a while when the car is at idle speed. At times it will
>idle low 400-600 rpms and knock off. At other times, I can crank it
>up, and it idles fine (600-800 rpm). I read another post suggesting the
>IAC valve may need to be replaced. I looked up how to locate/remove it
>in an aftermarket repair manual, and it suggested testing the voltage
>coming into the valve from the PCM. The manual stated that I should
>expect 10.5 - 12V with the ignition on. I measured about 2V. The
>manual does not go into other steps to perform if the voltage is low.
>Does this mean I have a bad PCM, or are there other steps I should take
>to rule out other problems?
>
>Thanks,
>JJ

is connection corroded??

hurc ast
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Old 03-31-2005, 09:01   #3 (permalink)
JJ
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Re: 2000 taurus idle problem

No, the connection looks pretty clean.

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Old 03-31-2005, 09:01   #4 (permalink)
sleepdog@optonline.net
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Re: 2000 taurus idle problem

Perhaps too much resistence in the wire causing a voltage drop?

Is the EGR valve getting vacuum when the idle is low?

Any codes present?

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Old 03-31-2005, 12:01   #5 (permalink)
eastwardbound2003@yahoo.com
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Re: 2000 taurus idle problem

Could you please fill us in on some history about the car. The type of
environment it's driven in i.e. dusty conditions, snowy, dry-hot,
mostly stop and go, mostly highway. Also the amount of miles on the
odometer. It helps knowing these things to better understand what
could be wrong with the car.

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Old 03-31-2005, 18:01   #6 (permalink)
gerald smith@impco.com
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Re: 2000 taurus idle problem

On 30 Mar 2005 20:11:33 -0800, "JJ" <jjfarrell@earthlink.net> wrote:

>I have a 2000 Ford Taurus with the FFV engine. I have been having
>problems for a while when the car is at idle speed. At times it will
>idle low 400-600 rpms and knock off. At other times, I can crank it
>up, and it idles fine (600-800 rpm). I read another post suggesting the
>IAC valve may need to be replaced. I looked up how to locate/remove it
>in an aftermarket repair manual, and it suggested testing the voltage
>coming into the valve from the PCM. The manual stated that I should
>expect 10.5 - 12V with the ignition on. I measured about 2V. The
>manual does not go into other steps to perform if the voltage is low.
>Does this mean I have a bad PCM, or are there other steps I should take
>to rule out other problems?
>
>Thanks,
>JJ


i would dissreguard that test
unless the engine is turning the pcm
knows the car is not at idle and would not
duty cycle the iac

hurc ast
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Old 04-01-2005, 10:08   #7 (permalink)
JJ
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Re: 2000 taurus idle problem

The car has 90,000 miles on it. I left out that it does have a new
fuel pump and fuel filter and the injectors have been cleaned. The
problem was occurring before the above work. The fuel pump died, and I
was hoping that the above work would solve the idle problem as well.
As for driving conditions, the majority of the miles are highway miles.
I live in Raleigh,NC, so not a lot of dusty or snowy driving. The
winters here are pretty mild and the summers are hot and humid. As for
the question about the codes, I am not sure. I have not taken it in to
the shop yet. I have spent $2700 (also had to have the transmission
rebuilt in addition to the stuff above) on repairs for this car the
last 3-4 weeks, so I was hoping to be able to fix this problem myself
and sell the car before something else goes wrong on it. This car has
been a real lemon. The first tranny was rebuilt at 46K and the second
time at 88K. I have never had a car with this many problems!

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Old 04-01-2005, 13:01   #8 (permalink)
JJ
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Re: 2000 taurus idle problem

Hurc ast...good call to disregard the test. My father-in-law also has
a 2000 Taurus and is visiting us this weekend. I took my voltmeter to
his car and received te same readings (2V) at the IAC Valve.
Apparently bad advice from my repair manual...

My next plan is to take his IAC Valve off and try it on my car to see
if that clears up the problem. The part is $80 at Advanced Auto, so
hopefully this test will tell me if I really need it before I go buy
one.

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Old 04-01-2005, 16:01   #9 (permalink)
gerald smith@impco.com
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Re: 2000 taurus idle problem

On 1 Apr 2005 12:27:42 -0800, "JJ" <jjfarrell@earthlink.net> wrote:

>Hurc ast...good call to disregard the test. My father-in-law also has
>a 2000 Taurus and is visiting us this weekend. I took my voltmeter to
>his car and received te same readings (2V) at the IAC Valve.
>Apparently bad advice from my repair manual...
>
>My next plan is to take his IAC Valve off and try it on my car to see
>if that clears up the problem. The part is $80 at Advanced Auto, so
>hopefully this test will tell me if I really need it before I go buy
>one.


heres a tip from a ford tech

FORD=JUNK

i dont know why yankees buy fords

hurc ast
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