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Todd Bouton
Dodge Dakota
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2/12/2002
09:53:52

Subject: IAT for '01, hey bernd...?
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I read on the dodgetrucks.com that the IAT adjuster has major probs on the '01 ingine.

MINE WORKS GREAT, 01 4.7 5spd, etc. etc.

Granted, This time of year I only used it twice so far, but no MIL's at all! Is the RAM different than the DAK?



RobW
Dodge Dakota
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2/12/2002
10:40:59

RE: IAT for '01, hey bernd...?
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I received mine at then end of the year, so haven't had a chance to try it out much (since it has been cold anyway). However, it sets off a check engine light whenever I turn it on - not right away but after a few minutes or so. If I then turn it off and clear the computer, the light stays off.

I was going to look at it a bit more this spring when I'd be using it more, but right now I don't know what the problem is.

-Rob W
01 CC RT



MikeD
Dodge Dakota
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2/12/2002
11:05:00

RE: IAT for '01, hey bernd...?
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I hooked mine up and tried it out a few weeks ago and drove around w/ it on all week long w/o any engine lights coming on.

~Mike~
'01 RC R/T



Anthony G
Dodge Dakota
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2/12/2002
12:04:51

RE: IAT for '01, hey bernd...?
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Give it some time it will happen, I had a check engine light come on. (Never happened until I install the IAT)I had to reset the system to clear the check engine light. Also it could of been the cause of my tranny not shifting from 1 to 2nd.(Never happened until IAT adjuster)

I haven't turned it on since I installed my M1. I just use it to extend my wires to the IAT sensor. (Expensive wire extender No more check engine lights or shifting problems. Been a few weeks.

01+ computer seem very sensitive to any changes in the system.



CW
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2/12/2002
14:35:45

RE: IAT for '01, hey bernd...?
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I have been experimenting on mine. I have had it turned on for about 500 miles now and no check engine light. Set it at 12:30 position. It is cool up here right now though 14 to 50 degrees of late. No check engine light though.

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

James
Dodge Dakota
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2/12/2002
17:11:19

RE: IAT for '01, hey bernd...?
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RobW and AnthonyG:
Just curious, are you guys turning it on while your trucks are on? If you look on bernd's web site (speedtweaks.net) he mentions not to turn the IAT adjuster on while the vehicle is on. This will produce the check engine light.



Anthony G
Dodge Dakota
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2/12/2002
17:49:38

RE: IAT for '01, hey bernd...?
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No I read that part. It occurred once or twice after 10 minutes of normal driving. Not sure if the IAT adjuster caused the engine to run rich thus throwing a check engine light. Maybe the setting I was using was wrong for the temp outside. Either way it's OK for short racing, giving that you set it to the proper temp. It does effect the engine. But for every day normal driving, I'll keep it off. I just need a full access to the ECU so I adjust the parameters myself. Muhahha



bernd
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2/12/2002
18:31:14

RE: IAT for '01, hey bernd...?
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Rob, did you hook up the wires correctly?

WHITE Wires = Black/Red and Black/Blue from sensor connector

BLACK Wires = Black/Red and Black/Blue from wires to PCM harness.

James: Some vehicles is doesn't matter on (switching it ON/OFF while running) but others it does (not year dependent either). This is why we don't recommend turning it ON/OFF while driving.


1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.55 @ 96.01mph

JAKE
Dodge Dakota
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2/12/2002
19:19:42

RE: IAT for '01, hey bernd...?
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Hey CW, did you port your TB by yourself or have it proffesionally done??



CW
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2/12/2002
19:36:04

RE: IAT for '01, hey bernd...?
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It was a home brew thing with the dremel tool. I used 60 grit sanding rolls and a grinding but to thin the shaft a little and grind down the screws. Like the way it drives ported much better.

Bernd I have been playing with the idea of halfing the throttle shaft for better flow. Taking the top half of the throttle shaft off. Do you think it will bend. I calculate a load of 64 lbs of force with the throttle closed under decel. Sounds like it will bend I was wondering if you ever tried it.

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

Rob W
Dodge Dakota
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2/12/2002
19:55:44

RE: IAT for '01, hey bernd...?
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Bernd,

Looks like the wires are hooked up properly - white to the sensor, black to the PCM. Also, I just tried it again on the way home from work. Turned the adj. on (while truck was off), and with the key in the 'on' position, everything was fine. Once I actually started the engine, about 5 seconds later the check engine light came on. If it makes any difference, I've check the connections and the look OK, and the adj. is set to about 12:30.

AnthonyG - I also just noticed a that my truck is having a hard time shifting from 1st to 2nd at WOT. If its is floored, it will hit 5200-5300 rpm and stay there as long as I keep the pedal down (ALL the way, and I don't keep it down all they way for too long...). If I let off just slightly, the truck will shift. I don't know if its related to the IAT adj. or not, but I only started seeing this a few weeks ago.

-RobW
01 CC RT
mods: K&N GenII, IAT, Fastman TB, Gibson headers, custom cat-back.



Rob W
Dodge Dakota
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2/12/2002
20:02:02

RE: IAT for '01, hey bernd...?
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Oh, and I've moved my TV cable all the way back and have very soft shifts right now, so I don't think that could be the problem with the 1-2 shift.

-RobW




bernd
*GenIII*
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2/12/2002
20:07:31

RE: IAT for '01, hey bernd...?
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CW: Don't go too thin with the shaft as there's another inherent problem as well...buzzing of the gas pedal. If you do, you'll need to place a vertical piece of thin metal in the intake tube to break up the air stream a bit (basically like a Helmholtz resonator system). Also, i'd be cautious with going to thin...if it breaks, there's only one way the pieces are going...down the intake. :(

Rob: I'm wondering if the box is defective...it shouldn't turn the MIL on that quick. Try it at 190 degrees just for a test...see if it trips the MIL as well.




1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.55 @ 96.01mph

Rob W
Dodge Dakota
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2/12/2002
22:04:33

RE: IAT for '01, hey bernd...?
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So far 190 looks like its OK. I'll try starting it a few more times tomorrow at different ranges to see what I come up with. Thanks for your help...

-Rob W



bernd
*GenIII*
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2/12/2002
23:52:13

RE: IAT for '01, hey bernd...?
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It may be too cold at the 12-1 o'clock position. This is a known "bug" with certain 2001+ models. If it trips the check engine light again, you may want to return it and just relocate the IAT (doesn't allow for much tuneability...but doesn't trip the MIL).

It's just something in the 2001 PCM code that causes this and isn't model/make specific.

Let me know what happens though...



1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.55 @ 96.01mph

CW
GenIII
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2/13/2002
09:26:07

RE: IAT for '01, hey bernd...?
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Mine is very linear just doesn't match the stettings on the box. Scan tool says 12:30 is 32.

2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.

Anthony G
Dodge Dakota
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2/13/2002
09:40:01

RE: IAT for '01, hey bernd...?
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Rob W,

I'm 80% sure that the IAT was causing my problem not shifting correctly from 1st to 2nd and 100% sure it tripped my check engine light.

The IAT adjuster does what it's suppose too, but my 2001 PCM doesn't like it.


(Here is my Theory)

Maybe the 2001's have a parameter that say's if IAT is reading 40-50 below in the intake manifold that the tranny needs to be in a cold mode, thus trying to increase the engine temp to normal. Due to the cold mode,(theory) tranny pressure runs higher than normal, so when you do WOT after the engine is actually operating at normal temp the pressure in the tranny from first to second is over 90 psi that it has trouble shifting. Since the IAT adjuster was put on runner 2 and just the heat from the intake manifold should be way over 34-40 even with it only trying to read the air. Maybe this is something Dodge did for emission reasons. I'm just guessing here, no proof other than it not liking the IAT on my 2001 R/T.

Again I'm just guessing here and could be way off. But reset your PCM and keep you IAT off, then see if you have any more problems with it's shifting.



Todd Bouton
Dodge Dakota
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2/13/2002
09:46:51

RE: IAT for '01, hey bernd...?
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Well, thanks for all the input.

I'll try it some more to see if it comes on. I thought the instructions say to try it at the 10-11 o'clock postion?

I have no problems with shifting to any gear, JUST PUSH IN THE CLUTCH AND SLAM IT HOME! ;-)

Todd Bouton
01 4.7 5 spd LSD, no fan, IAT, homebrew ram air, 180 t-stat, mobil one, etc.

still thinking about the gas powered leaf blower down the intake! -just kidding



Muzzy
GenIII
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2/16/2002
01:53:28

RE: IAT for '01, hey bernd...?
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I have gotten a MIL a few times with mine. I get a p0111 code which is "Intake air (charge) temperature sensor voltage irrational performance". The PCM is continously evaluating data from all senors, and comparing data it receives to stored values. My theory is the PCM is looking for variance from the IAT sensor, but when you set it to a constant value for a prolong time, the PCM sees this lack of variance as a fault in the sensor. Just like the O2 sensor should never be sending one constant value. It should be bouncing around high and low with an average around .47 of a volt. It is not feasible for the IAT to vary as much as the O2 sensor, but it should some as driving conditions are changing. Every time I have tripped a MIL, I have been on the highway for a while. Short trips around town don't seem to do it.

My theory on why this seems to not affect 2000 and older vehicles is the 2001 change to CA emissions. Since all 2001 and new vehicle are required to conform to CA emission, Chrysler probably had to more strictly govern the sensors in the PCM code to meet compliance.

My 2 cents....

-Muzzy



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