MAP Sensor - 1G IM vs 2G IM

[larryd]

ok, in my endless search for more information im confused yet again..

the 2g IM has a MAP sensor on the IM which ive circle in the picture below..

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the 1g IM does not have this MAP sensor on the IM, what am I supposed
to do with the thing?

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[larryd]

and one other thing, can I get rid of the EGR and the EVAP all together, that would pretty much eliminate all the hosing in the engine bay.

 

[JET]

Yeah, the EGR can go. Mine is totally gone.

 

[larryd]

does anyone know what i do with this sensor i circled in the picture??

 

[g96nt]

bring the intake manifold(it *SERIOUSLY* took me this long to figure out IM was intake manifold, and not Idle motor) to you local machine shop, and bring your map sensor. Have Them drill/tap the two holes for the screws, and drill/polish One hole for the sensor part. make sure the fittment is snug. You may decide to replace the o-ring, and *POSSIBLY* use some ultra grey to seal 'er up.
you could also go as far as to *hide* the map Sensor on the rear of The intake, or under the "lip"

have Some Fun... clean The engine bay up.

and As far as the EGR goes.. you Will eliminate the hoses, and whatnot.. but in Order To avoid CE lights... you may want to leave the solenoid plugged in (or devise a Way to *trick* the ECU)

 

[larryd]

but the question is do i have to do this or can i just leave it plugged in and hanging in the engine bay.. i know it will cause a CEL which im not worried about becuase when I get the dsmlink i will just get rid of that code..

and can anyone tell me can I get rid of all the on the 1g TB, essentially cap them all off and get rid of the EGR, Purge Solenoid, and EVAP??

 

[90GSX]

Originally posted by larryd

the 2g IM has a MAP sensor on the IM which ive circle in the picture below..

the 1g IM does not have this MAP sensor on the IM, what am I supposed
to do with the thing?

Unless thats a 2G NT Intake manifold, I'm pretty sure you're not going to find a MAP sensor anywhere on it.

The 4G63's all come with MAS sensors to measure volume of intake air, as opposed to MAP sensors, which measure pressure. It must be some other sensor, but since it's a 2G I'm not sure what it is.

Regardless, if you want to add it to your 1G manifold you should be able to take it to any decent machine shop and have them bore and tap the required holes.

 

[g96nt]

2g's use the MAP sensors.. I believe It's mainly for idle, but you need it.

like I said.. if you're looking To clean it up..... hide it..
I had mine Disconnected a While back, when I went with the complete 1g setup. it idled odd, and threw a CE full-time

if you have dsmlink, you could ditch the CE code all together.

keeep it, hide it.
it's there for a reason.

 

[swordfish]

Just tap the 2G map sensor into a vacuum line and use some RTV to seal it up. That's how I did it and have never had any problems. You can also check out shawn gradek's site www.turbo4wd.com and dre's site www.twingles.com/ideck for pics.

Shawns site will give you step by step instructions of how to do this in the 1G/2G headswap section. It also shows a few things he tried that failed.

Hope this helps.

jeff

 

[90GSX]

Well, I stand corrected. I was unaware of the existence of a MAP sensor on a turbo DSM, except those added for a VPC, standalone, etc...

What exactly does the 2G MAP sensor do? How does it interact with the MAS? It would seem somewhat reduntant to have two volume air measuring systems, since the 2G MAS works well. The 2G MAP must be used for some secondary function, possibly related to the OBDII diag. ??? Anyone know ???

 

[swordfish]

Actually it's an MDP sensor not a MAP sensor. MDP is Manifold Difference Pressure. Sounds funny but that's right out of the dealership tech manual. The manual states that it was added to detect changes in manifold vacuum. That's all I could find. Even in the system block diagram this sensor leads to nothing. All the other sensors have an arrow that leads to something. The is probably one of hte reasons for the 2G ECU being so stingy with timing.

jeff

 

[larryd]

ok so what can i do with it.. i really dont want to take my intake manifold to a machine shop to have them fabricate something for it.. this sensor is purely electrical, no vacuum hoses on it..

 

[swordfish]

There are physically no vacuum hoses on the sensor from the factory but take a closer look at it. The little nipple the fits into the stock 2G manifold is a vacuum port. Thats where you use the RTV to connect a vacuum line.

jeff

 

[larryd]

ok, i have a 1g manifold, no such port.. since i disco'd everything else and I do mean everything I capped off the EGR, I removed all the hosing to the TB and capped off all 4 ports on the TB, I remove the purge solenoid and EVAP and capped off the sensor on the firewall.. can I just cap off this sensor? like RTV it and put a cap on it?

I know Ill have CEL's which im not worried about cuz once I get the DSMlink I can eliminate all those CELs but will the car run ok?

 

[swordfish]

Are you talking about the MAP (MDP) sensor that usually bolts right into the 2G manifold where you have circled in the top photo? Just making sure we are on the same page here. If this is the sensor you are talking about, then the sensor itself will have the port type nipple on it. Its very small. There is an O-ring around the area of the sensor that fits into the 2G manifold. You will have to "T" into another vacuum line for a signal for this sensor. If you do not have the senor connect the car will run like ass, I mean terrible. I just T'd mine into the vacuum line coming off the FPR.

I am going to upload som photos I have to my site and then I will post then on here, hopefully they will be of some help.

jeff

 

[swordfish]

This picture is of the sensor itself. I have an arrow pointing to the port. Notice the O ring on the larder part of the port. Also notice the tiny blobs of RTV.

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Thia picture is of the Map sensor coneected with a hose that is much too big. It is circled.

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Thanks to Andre Cardadeiro and Shawn Gradek for the photos.

 

[swordfish]

Here is the photo of the MAP (MDP) in its final resting place. Notice that the vacuum line used now is much small. It has been clamped and RTV'd. I only used copius amounts of RTV on mine and it worked fine. Be sure NOT to get any inside the port itself as this will throw the readings off.

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jeff

 

[larryd]

yes that is the sensor im talking about but on the inside of mine it doesnt look like the port thing is as big for you to put something on it, Ill have to go back and look again BUT if I can then will run a line from that sensor to a T block off the fuel pressure regulator.

it makes sense.. I planned on having it plugged in like electrically plugged in but I was just gonna let it hang in the engine bay, i didnt know it would have to take a reading for the car to run right becuase I thought the MDPs only purpose in life was regarding the EGR?

 

[swordfish]

Yes the nipple is very very small. THe RTV will make it stick. RTV the vacuum line to the sensor first and let it set off to the side for about an hour. Then it will be setup enough to work with.

jeff

 

[larryd]

ok makes sense.. the only thing im confused about is in this picture

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it looks like the vacuum hose is 2 different sizes, like it starts off small and where it acually connects to the sensor its larger??

 

[swordfish]

Sorry it took me so long to reply. The smaller port is the one you want to try to fit the hose too. The larger port helps to seal with the RTV.

jeff

 

[larryd]

yeah i understand it.. i tried doing this 2nite and no luck.. getting a small hose to actually stay on that nipple is almost impossible.. i got frustrated after 20 mins and gave up.. will try again tomorrow

 

[cmc]

I had the same problem, I tapped the map sensor into the vac line that runs behind the "IM" to the brake booster! Works fine! But like the idea of machining the "IM" better.

 

[larryd]

yes machining the IM would be a great idea but I certainly dont feel like pullin the IM off the car again .. the the line on the back of the IM works as well?? Id rather tap there then the FPR becuase the FPR is already tapped 2x