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N56629
Dodge Dakota
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11/03/2004
08:27:32

Subject: RE: IAT Adjuster - Dyno Results are in
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??????, resistence deccreases with an increase in temperature. I agree, these engines run way too rich during very cold weather. The only problem you may run into is that it may not agree with what other sensors tell the PCM and it could throw a trouble code. Just guessing, but I would try it anyway.



Tony
Dodge Dakota
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11/03/2004
18:56:26

RE: IAT Adjuster - Dyno Results are in
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OK - I'm confused. I should've followed this trend
more carefully, but are you saying the engine runs
rich in cold weather because of the stock location
OR the "aftermarket" location? Always planned on
relocating the sensor, but never had the time.



N56629
Dodge Dakota
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11/03/2004
20:29:14

RE: IAT Adjuster - Dyno Results are in
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Tony, if you live in CA, don't worry about it. It's a winter thing for those of us that live in far north.

When the temp starts heading below freezing we experience things that almost never happen down south. Down there, if your torque converter didn't lockup within a few seconds they would think some went wrong.

In this case it doesn't matter where the IAT is located. I usually advise those people that live up north to leave the sensor where it is and purchase a second one to install upstream. During the summer you can hook up to that one and during the winter move the wiring back to the sensor in the stock location.

The engine runs richer because the IAT senses colder more dense air. It's a weight ratio thing with cold air being heavier than warm air and therefore requires more fuel to maintain the proper ratio.

If you are handy with tools you can install a second IAT in about five minutes.



Tony
Dodge Dakota
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11/04/2004
14:51:27

RE: IAT Adjuster - Dyno Results are in
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I live in Lawn Guyland Knew Yawk & it can get quite
cold here - esp. with wind chill & living next to
the ocean! I do venture every January to my family's
place in Sandy Eggo where it's much warmer.

Thanks for clearing it up.



android287
GenIII
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11/04/2004
21:40:56

RE: IAT Adjuster - Dyno Results are in
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Yup, its starting to get a little chilly up here in Mass and my gas mileage is starting to suck again. In the spring and summer i usually get just a tad over 17. Now with the cold weather coming i'll be happy to get 15.



Tony
Dodge Dakota
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11/05/2004
00:15:25

RE: IAT Adjuster - Dyno Results are in
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Maybe if the IAT was wired up in such a way as not
to read a temp. below, say, 60 degrees? Just thinking
while I'm half asleep, but if it gets richer as the
temp gets lower, a circuit attached to the IAT should
stop reading temps below a certain temp. Like 60 degrees F.
The PCM will not get a reading below 60 degrees F as a
result.

Hope that doesn't confuse anyone.Let me know what you all
think.



N56629
Dodge Dakota
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11/05/2004
06:45:24

RE: IAT Adjuster - Dyno Results are in
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Tony, that's pretty much what I was getting at. You could eliminate the sensor all together and substitute a calibrated rheostat. There's really no need to wire it into or in conjunction with the sensor. The only problem you might run into and that is if another sensor, like a coolant temp sensor, sends conflicting information to the PCM. That would throw a trouble code.

Are you thinking that a steady 60 degree reading would be optimum?



Tony
Dodge Dakota
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11/05/2004
16:42:02

RE: IAT Adjuster - Dyno Results are in
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I'm using 60 degrees as an example - don't know of
a good temp. off the top of my head. Here in N.Y.
I see the temps as low as 0 & as high as 100. It's
something thatneeds more data & research as I'm sure
there's a cheap solution. With $2+/gallon gas, I'm
sure more people will be looking at their gas
consumtion more. A rich running engine means more
fuel consumtion.

I don't have a shop manual, but would like to know
what temp (at the IAT) the engine would start to
run rich in closed loop mode. My exp. is with GM
OBD2 & I would imagine it's similar with DC.



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