Cleaning the MAP and intake air temp. sensor - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 10 (permalink) Old 01-02-2008, 01:53 AM Thread Starter
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Cleaning the MAP and intake air temp. sensor

Note: I'm not recommending this. It's something I tried once, today, and it appears to have worked for me. I took a short test drive afterwards, but tomorrow will be the real test. So try this at your own risk.

My '04 SXT was idling somewhat rough and the mileage has been falling.

Talking to some mechanic friends, they recommended I check and clean the MAP sensor and intake air temp sensor, especially when I told them I was using a K&N air filter. They said the oil in those filters can coat the intake air temp sensor and skew it's readings. Also, oil from the PCV valve can coat the MAP sensor and skew it's readings.

The intake air temp sensor on my car was almost completely coated on the side of the incoming air. And the MAP sensor had a thick coating of engine oil in it.

They recommended a spray solvent made by CRC called "QD Contact Cleaner." You can get it at Lowe's and Home Depot, in the electrical area.

I got some and cleaned the MAP and temp sensor and bingo: instant smooth idle. Tomorrow I'll check the fuel economy.

They also said to use the CRC QD Contact Cleaner on the O2 sensors, if you have codes on them, before replacing the sensors. They also said to blow out the O2 sensor on the outside of the case where it samples outside air. I'll try that this weekend.

To clean the MAP sensor: remove it from the manifold and very gently spray the inside of the sensor. There is a silicon membrane in there, and another temp. sensor, according to the FSM. So just barely pull the trigger on the spray cleaner, let it fill up with the solvent, then turn it over and let it drain out. Do that two or three times, that is all it takes to remove the oil. There is an o-ring on the sensor. If it is old and not sealing well, wind some teflon pipe-thread tape around it a few times and that will ensure a good seal. Make sure the tape does not cover the opening of the sensor.

To clean the intake air temp sensor: remove the duct from the throttle body and spray the sensor. Two or three shots will remove almost any oil-based contamination from it.

The stuff dries fast, almost instantly. The can warns that the fumes are highly flammable.

Jim Snover

Last edited by James88; 01-02-2008 at 01:56 AM.
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post #2 of 10 (permalink) Old 01-02-2008, 09:03 AM
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I cleaned both of these sensors on my engine back in the summer. Both were completely caked with gunk. The temp sensor was just one giant glop of carbon and tar - couldn't see the plastic cage around the sensor element at all.

I used Chemtool B-12 because that's what I had on hand. A bit harsh I know, but I crossed my fingers that it wouldn't damage either sensor. The result in my case was a huge reduction in pinging.

I wouldn't worry about the K&N filter fouling these sensors. The PCV system may foul them faster than any oiled air filter element. At least it will on a 2.7. Not sure about the 3.5.
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post #3 of 10 (permalink) Old 01-02-2008, 11:18 AM
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I'm suprised the MAP would have anything on it at all. Vacuum is pulling crap away from it since its in the furthest area of the plenum on the 2.7 from the PCV. The IAT however, is right in a direct path to the driver's side cylinders so I imagine that looks like ass when you guys pulled them.
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post #4 of 10 (permalink) Old 01-02-2008, 12:08 PM
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when I pulled out my map sensor the other day, it dropped several drops of oil on the floor. In the summer, I dumped the oil out of the plenum and short few month later, there's a small supply of it in there again. So oil builds quick...

I don't think this is unique to this engine. The GM LE5 that we have in our test cell at school also accumulates oil in the intake manifold. I wish they can figure out a better way to design this...
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post #5 of 10 (permalink) Old 01-02-2008, 01:00 PM
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A catch can would work wonders, but it would require the vehicle owner to actually empty it from time to time. The average Joe probably would not, which is why much of the maintenance schedules are a lot longer than they used to be. Most vehicles use platinum tipped plugs that will go 100K miles and still be running well. One less thing for the average car owner to not have to worry about.
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post #6 of 10 (permalink) Old 01-02-2008, 10:31 PM
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Quote:
Originally Posted by froggy81500 View Post
A catch can would work wonders, but it would require the vehicle owner to actually empty it from time to time...
Maybe more trouble than it's worth, but you could have the catch can with a drain (back into the crankcase) and a normally open solenoid valve - IOW, with ignition off, the solenoid would open and the trap would self drain. Any time the ignition was on, the solenoid valve would be energized and therefore closed. That kind of setup is often used in industry for compressed air line moisture traps and similar. This would just be on a smaller scale.
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post #7 of 10 (permalink) Old 01-03-2008, 09:23 AM Thread Starter
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I was thinking of adding a Fumoto valve to an air trap. Not automatic, but very easy to operate.

Jim Snover

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Maybe more trouble than it's worth, but you could have the catch can with a drain (back into the crankcase) and a normally open solenoid valve - IOW, with ignition off, the solenoid would open and the trap would self drain. Any time the ignition was on, the solenoid valve would be energized and therefore closed. That kind of setup is often used in industry for compressed air line moisture traps and similar. This would just be on a smaller scale.
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post #8 of 10 (permalink) Old 01-05-2008, 07:57 PM Thread Starter
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Today I pulled the O2 sensors. They looked good, almost the same coloration as a sparkplug in a well runnng engine. Cleaning them made no change whatsoever. I did swap them side-for-side, and my persistent P0420 came back within 25 miles. Looks like I need a passenger's side cat.

When I fix this once and for all, I think I'm gonna miss not seeng the P0420 pop up whenever I slow down to less than 55mph. It's like an old friend, you can always count on it to be there. Nevertheless, it's now in the same status as a guest who will never leave. It's time to throw the bastard out!

Jim Snover
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post #9 of 10 (permalink) Old 03-30-2008, 04:11 PM
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IAT sensor

I have been getting some struggling of the engine when going uphill or sometimes just regular driving. I have to raise the rpm's for it to even out a little bit. I smell either exhaust or excess gass that isnt being used. And I am losing mpg.

I know it could be a million things but I thought I would try the sensors first.

I pulled my MAP sensor today and it had oil and gunk on it. Cleaned it out.

I went to look for the IAT and couldn't find it. I have a Haynes manual and according to the picture I couldnt find where it was supposed to be. I checked the intake plenum area and according to the picture its supposed to be near the MAP sensor. No go.

I have a 95 Dodge Intrepid ES 3.3 v6 engine. Any ideas where it could be?
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post #10 of 10 (permalink) Old 03-31-2008, 12:34 AM Thread Starter
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On the 3.5's it is located in the plastic ducting right before the entrance to the throttle body. Right in the apex of the curve of the duct. I found it easiest to clean by pulling that section of duct off and leaving the sensor in it.

But I have no experience on 1st-Gen's or on the 3.3. Hopefully it is somewhat similar.

Jim Snover

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Originally Posted by plaino View Post
I have been getting some struggling of the engine when going uphill or sometimes just regular driving. I have to raise the rpm's for it to even out a little bit. I smell either exhaust or excess gass that isnt being used. And I am losing mpg.

I know it could be a million things but I thought I would try the sensors first.

I pulled my MAP sensor today and it had oil and gunk on it. Cleaned it out.

I went to look for the IAT and couldn't find it. I have a Haynes manual and according to the picture I couldnt find where it was supposed to be. I checked the intake plenum area and according to the picture its supposed to be near the MAP sensor. No go.

I have a 95 Dodge Intrepid ES 3.3 v6 engine. Any ideas where it could be?
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