Engine/Transmission (1998.5 - 2002) Relocating the MAP and IAT sensors!

[mhenon]

I was think of drilling and tapping the intake horn to accept the MAP and IAT. I'll run a set of pitails to bring the electricals up to the new locations and leave the old sensors in place to keep those holes filled.

Why... checking or replacing those sensors would be a snap. Also, the two still in the origional place could be back-ups if one went bad.

Do you think the readings would be correct with the sensors moved this far upstream.

Mike

 

[BTowler]

The map should be fine there, but the IAT would not read properly when the grid heaters are cycling since it will be pre-grid.

 

[mhenon]

Thought about that but they're not on that long. I've pretty much disconnected mine and just plug in at night but i can see having to hook them back up when travelling.

This is hardly a 'must do" project. I just like things where I can get at them. Now if I can find a place to move the Cam Position Sensor... ... .

Mike

 

[NoSeeUm]

If you still are stock, you will lose a bit of Hp moving the MAP I would think. Because of the restriction in the intake the ECM will defuel sooner.



Jim

 

[mhenon]

Hmmmm. . hadn't thought of that but I think you're right. Is defueling triggered by RPM or boost? I'm not much of a hot rod but do tow pretty heavy.

Mike

 

[mhuggler]

The IAT sensor doesn't have to be in the intake at all. A Cummins dealer will have a kit to relocate it above the ecm on the outside of the engine. It's used primarily for exhaust brake equipped engines that have trouble with sensor coking. It shouldn't make any noticeable change in performance.

 

[NoSeeUm]

Hmmmm. . hadn't thought of that but I think you're right. Is defueling triggered by RPM or boost? I'm not much of a hot rod but do tow pretty heavy.

Mike

Both... .



My truck defueled around 25 psi manifold pressure. I with the restriction and mounting the MAP in the air horn, I would suspect that would happen around 23 psi in the manifold. Likely nothing you would notice, but your mileage may vary.



Jim

 

[mhenon]

I may actually never do this mod. Just thought it would be simple to do and easy to maintain both sensors if they were hanging out there where you could see them.

As we RV alot and spend some time in Mexico in the winter... I want to know "I" can fix something should it go belly up 50 miles from no where.

But. . it sounds like no see's a real problem with the move. Thanks for all the feed-back.

Mike

 

[Katmandu]

The IAT sensor doesn't have to be in the intake at all. A Cummins dealer will have a kit to relocate it above the ecm on the outside of the engine. It's used primarily for exhaust brake equipped engines that have trouble with sensor coking. It shouldn't make any noticeable change in performance.

Does the IAT have anything to do with Grid Heaters cycling On and Off ??

 

[mhuggler]

The grid heater cycling is determined through IAT and coolant temp. sensors.

 

[MErickson1]

On a side bar note, I read that if you replace the IAT sensor that it could possily improve your fuel economy ( if you have a dirty IAT).



I went to chrysler and asked them for a new IAT, the guy at the counter didn't know which part it was exactly



Do any of you have a part number ???



Thanks !

Matt

 

[mhenon]

You could try just cleaning the sensor instead of replacing it.

Mike

 

[mhenon]

That's kinda the reason for this whole concept... getting those two sensors on the intank horn where they're easy to get at.

Mike

 

[MErickson1]

You could try just cleaning the sensor instead of replacing it.

Mike

Where are they exactly and which one is which ?



:{ I'am as green as this face... . when it comes to this stuff !

 

[mhuggler]

The map sensor is the one behind the fuel filter. The IAT sensor sits diagonal at the back of the head going in the intake. It's not fun to get to.

 

[Graphic man]

you can test your IAT in a pot of water on the stove



Temperature Resistance

30° 40K

32° 30k to 36k ohms

76° 13K ohms

77° 9k to 11k ohms

81° 6. 87K ohms

122° 3k to 4k ohms

130° 4K ohms

167 600 to 675 ohms

212 600 to 675 ohms





Scott

 

[Katmandu]

Where are they exactly and which one is which ?

This is the AIT sensor on a 12 Valver.

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[walkabout]

I moved my IAT sensor up to the intake horn and it works better. I had a problem of cold/high altitude starting. I think the sensor was seeing the warm air to soon, turning up the fuel, and causing a flood like condition thereby making it very hard to start above 7000 ft. Moving the sensor helped that and didn’t seem to hurt any thing else.

 

[mhenon]

Well... It's good to hear someone has tried it already. I may just do it now. Wasn't too worried about moving the MAP but didn't know if the IAT would get a cold reading at the intake.

Thanks... Mike

 

[MErickson1]

This is the AIT sensor on a 12 Valver.



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Awesome thanks !



It doesn't get any better than that