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can water temp sensor cause idle problems?

  
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fawilson

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Since: Aug 26, 2007
Posts: 10



(Msg. 1) Posted: Thu Aug 30, 2007 10:55 pm
Post subject: can water temp sensor cause idle problems?
Archived from groups: alt>autos>dodge>trucks (more info?)
Hello,

I have been chasing this rough idle problem for some time now. I have
replaced a lot of stuff (IAC, MAP, intake air sensor, and tested the
TPS). I was reading the Haynes manual and it says the water temp
sensor is connected to the fuel injector system some how. Can this
cause an idle problem?

Thanks,
Fred

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SnoMan

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Since: Sep 20, 2005
Posts: 1001



(Msg. 2) Posted: Thu Aug 30, 2007 10:55 pm
Post subject: Re: can water temp sensor cause idle problems? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Fri, 31 Aug 2007 01:51:39 -0000, fawilson
<wilson.frederick DeleteThis @gmail.com> wrote:

>Hello,
>
>I have been chasing this rough idle problem for some time now. I have
>replaced a lot of stuff (IAC, MAP, intake air sensor, and tested the
>TPS). I was reading the Haynes manual and it says the water temp
>sensor is connected to the fuel injector system some how. Can this
>cause an idle problem?

Engine temp is used as a base line to set mixutre (that and MAP
sensor at startup determining pressure altitude) so it is conceivable
that it could effect idle but it would likely have running problems
too.
-----------------
TheSnoMan.com

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Bill Dukenfield

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Since: Aug 31, 2007
Posts: 14



(Msg. 3) Posted: Fri Aug 31, 2007 1:56 am
Post subject: Re: can water temp sensor cause idle problems? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
fawilson wrote:
>
> Hello,
>
> I have been chasing this rough idle problem for some time now. I have
> replaced a lot of stuff (IAC, MAP, intake air sensor, and tested the
> TPS). I was reading the Haynes manual and it says the water temp
> sensor is connected to the fuel injector system some how. Can this
> cause an idle problem?
>
> Thanks,
> Fred

What model and year is the vehicle?

JAM
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Denny1

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Since: Jul 12, 2003
Posts: 567



(Msg. 4) Posted: Fri Aug 31, 2007 4:24 am
Post subject: Re: can water temp sensor cause idle problems? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"fawilson" <wilson.frederick DeleteThis @gmail.com> wrote in message
news:1188525099.083326.18570@l22g2000prc.googlegroups.com...
> Hello,
>
> I have been chasing this rough idle problem for some time now. I have
> replaced a lot of stuff (IAC, MAP, intake air sensor, and tested the
> TPS). I was reading the Haynes manual and it says the water temp
> sensor is connected to the fuel injector system some how. Can this
> cause an idle problem?
>
> Thanks,
> Fred
>
Yes it can....but...

When a coolant temp sensor give an incorrect reading it causes the fuel mix
to be either too rich or too lean. If your oxygen sensors are working
correctly they will sence the rich/lean mix and the pcm will compensate for
it. You would probably not notice this when driving the vehical. What you
would notice is the idle speed may be too high or too low as this is the
sensor the pcm looks at to set idle speed. Depending on how new your vehical
is the pcm could still give a fairly correct idle speed by looking at other
sensors and/or calculating run time.

It looks like it's time to get a scanner on it instead of throwing parts at
it. It may save you some money in the long run.

Denny
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beekeep

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Since: Dec 24, 2003
Posts: 312



(Msg. 5) Posted: Fri Aug 31, 2007 9:55 am
Post subject: Re: can water temp sensor cause idle problems? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Fri, 31 Aug 2007 01:51:39 -0000, fawilson <wilson.frederick DeleteThis @gmail.com> wrote:

>Hello,
>
>I have been chasing this rough idle problem for some time now. I have
>replaced a lot of stuff (IAC, MAP, intake air sensor, and tested the
>TPS). I was reading the Haynes manual and it says the water temp
>sensor is connected to the fuel injector system some how. Can this
>cause an idle problem?
>
>Thanks,
>Fred
>
It is very posible. IIRC you disconnect the temperature sensor to check the
timing.

beekeep
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