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Possible MAP sensor going bad?

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Old Jun 19, 2010 | 12:26 PM
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2006 E55 AMG
Possible MAP sensor going bad?
Hey guys, I was driving my car yesterday and I noticed that my idle was rough at idle. I turned on my logger and found that my vacuum was low (10 in Hg) which I believe caused my AFR's to go lean. This same condition was still present while driving so I pulled over and cycled my key off and on, this fixed the problem and all was fine. It happened one more time last night while doing a little driving and the same procedure fixed the problem....weird. I'll be testing for a vacuum leak but it's hard for me to believe if this was the case a simple cycling of the key would temporarily fix the problem. I believe the MAP is the culprit even though with no CEL...thoughts?

As of now the car is running fine and any suggestions you guys might have would be appreciated. I'm not sure if this is cam related or not but I have close to 1000 miles on my cams and this is the first problem I have seen.

Edit: From what I've been told the leaner AFR's would cause the lower vacuum readings. I just spoke with my friend and he had the same issues and replacing the MAP fixed the problem....identical issues with the same cycling of the key to temporarily fix the problem.

83 views and no one has any other input....
Last edited by bassn_07; Jun 19, 2010 at 03:11 PM.
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Old Jun 19, 2010 | 07:52 PM
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Have You removed the supercharger recently.I had a similar problem that was caused by a leak and it threw a bar map pressure code and once I turned the car off and on it was fine.
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Old Jun 19, 2010 | 08:11 PM
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Originally Posted by skratch77
Have You removed the supercharger recently.I had a similar problem that was caused by a leak and it threw a bar map pressure code and once I turned the car off and on it was fine.
Yes I did. The only reason why I'm not suspecting that is because since my tech removed the SC no CEL codes at all. Well, except for the rear O2's but I don't really care about that much and the issue is being resolved.

How often did you have the issue? I just got done driving the car most of the day it drove like a champ..... Had a few WOT throttle runs up to 100 and it's pulling fricken harder than ever. The boost is right where it's supposed to be which if I was leaking I would think it would be down. At idle was great, low load drive-ability was perfect, and in neutral . There are no signs that are pointing anywhere, but after researching all the symptoms I'm having point to a failing MAP. I'm hoping I pull a CEL soon so I could better determine what to do. Either way MAP's are cheap enough that I will just purchase one.

Isn't modding fun....!!!!
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Old Jun 19, 2010 | 08:59 PM
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Its these little things that make modding fun haha.On my car it ran fine also and we were puzzled,after my second time taking the supercharger off we used brand new gaskets and put on some slicone sealer everywhere.After bolting everything back up the code never came back.

I got it to do this 4 times and noticed it would do it more in the colder weather.Its been a few months now with no issues(knock on wood)and zero codes being thrown.

I say try a new map sensor and see where it goes.
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Old Jun 19, 2010 | 09:12 PM
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It does sound like you may have a failing MAP sensor.... easy fix
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Old Jun 19, 2010 | 09:50 PM
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Originally Posted by MB_Forever
It does sound like you may have a failing MAP sensor.... easy fix
Yeah, the part is cheap but I hear it sucks to get to...damn. Why does MB have to make it so difficult. Either way I'll either do it at my brothers shop or my tech will take care of it.

Does anyone have any recommendations on where to get it from? I have checked the typical stores I've seen here online but haven't had any luck. The part number I believe is 0051537228.
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Old Jun 19, 2010 | 09:55 PM
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Yea it sounds like your car is just slow and you probably should sell it. I'll take it and part it off with what little remains on the vehicle that is in good condition. No worries, you can just get a nice black CLS55 instead.
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Old Jun 19, 2010 | 10:01 PM
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Just wondering where's the map sensor in our car?
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Old Jun 19, 2010 | 10:13 PM
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Originally Posted by Mikesamg
In a race to take the title for best Avatar from Hammer Down
Hey Mike how do you like that one

Alan can your tech get you a new MAP sensor?
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Old Jun 19, 2010 | 10:16 PM
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Originally Posted by Hammer Down
Hey Mike how do you like that one

Alan can your tech get you a new MAP sensor?
It's ok but not sure I wanted to look at a pic of you wearing you banana hammock while in Hawaii

So I ran into a guy in Tracy that has a Black Chevelle, ever have a run in with one out here before?
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Old Jun 19, 2010 | 10:20 PM
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Originally Posted by Mikesamg
It's ok but not sure I wanted to look at a pic of you wearing you banana hammock while in Hawaii

So I ran into a guy in Tracy that has a Black Chevelle, ever have a run in with one out here before?
black guy or white guy? if he was black i believe he was the guy that has the Z06 that I raced a couple of years ago.
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Old Jun 19, 2010 | 10:25 PM
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Originally Posted by Hammer Down
black guy or white guy? if he was black i believe he was the guy that has the Z06 that I raced a couple of years ago.

White guy, black Chevelle, said he ran a silver E55 out here. He has 1000hp in it right now, he just finished building the engine. His brother had an SL or S65 so it was nice that he actually knew what the car was.
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Old Jun 19, 2010 | 10:33 PM
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Originally Posted by Mikesamg
White guy, black Chevelle, said he ran a silver E55 out here. He has 1000hp in it right now, he just finished building the engine. His brother had an SL or S65 so it was nice that he actually knew what the car was.
I'll keep a look out, but the only street race that I have had in my car was against that Z06. I know that there are bunch of wantabee's out here S430 AMG, S550 AMG, E350 AMG
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Old Jun 19, 2010 | 10:36 PM
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Originally Posted by Mikesamg
Yea it sounds like your car is just slow and you probably should sell it. I'll take it and part it off with what little remains on the vehicle that is in good condition. No worries, you can just get a nice black CLS55 instead.
What little remains good on my car? Fill me in because the last I looked my ***** is looking pretty good. Go and get your swirled a$$ paint job detailed and clean your rims.

I'll pass on the CLS, if i get another MB it's going to end with a 65.
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Old Jun 19, 2010 | 10:41 PM
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Originally Posted by Hammer Down
I'll keep a look out, but the only street race that I have had in my car was against that Z06. I know that there are bunch of wantabee's out here S430 AMG, S550 AMG, E350 AMG
I have seen a lot, the black E350 AMG works at the lab with me and there is a white CLS that is badged CLS63 in the rear and sides and it's just a regular CLS. The funny thing is he works at the Tracy Community Church. Do you think he tells God that he drives a lie everyday?
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Old Jun 19, 2010 | 10:41 PM
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Originally Posted by bassn_07
Go and get your swirled a$$ paint job detailed and clean your rims.
the swirls make it go faster
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Old Jun 19, 2010 | 10:43 PM
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Originally Posted by bassn_07
What little remains good on my car? Fill me in because the last I looked my ***** is looking pretty good. Go and get your swirled a$$ paint job detailed and clean your rims.

I'll pass on the CLS, if i get another MB it's going to end with a 65.
Yea no ***** if he doesn't do it this next week like he said I'm giving up and going to San Jo to do it. Rims are clean though You redo the grill?
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Old Jun 19, 2010 | 10:49 PM
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Originally Posted by Mikesamg
Yea no ***** if he doesn't do it this next week like he said I'm giving up and going to San Jo to do it. Rims are clean though You redo the grill?
I'm just taking to a place called B-Line over here. They said it shouldn't cost much at all but I'll find out next week.
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Old Jun 19, 2010 | 10:54 PM
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Being that you had it apart recently, I would unplug the Map sensor connector, clean it out and reseat it.
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Old Jun 19, 2010 | 10:54 PM
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Originally Posted by bassn_07
I'm just taking to a place called B-Line over here. They said it shouldn't cost much at all but I'll find out next week.
AJ is down in San Jo I know a lot recommend him and he's mobile, Sonic recommends him too. I got his card if you want. It's really not much I just don't want someone burning through the CC since it's harder on MB's. I don't want another retard coming out claiming he can fix it like last time just to waste the whole day.
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Old Jun 20, 2010 | 03:03 AM
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Originally Posted by Forrest Gump 9
Just wondering where's the map sensor in our car?
I believe it sits in the y that goes to the surge tanks
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Old Jun 20, 2010 | 03:13 AM
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Originally Posted by blackbenzz
I believe it sits in the y that goes to the surge tanks
Do you have a map that shows us where? <~~~ lamest joke in MBWorld history!
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Old Jun 20, 2010 | 04:00 AM
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Here's a link to a picture of the Y-pipe and where the MAP mounts.

https://mbworld.org/forums/3829340-post3.html
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Old Jun 20, 2010 | 07:54 AM
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Originally Posted by bassn_07
Yeah, the part is cheap but I hear it sucks to get to...damn. Why does MB have to make it so difficult. Either way I'll either do it at my brothers shop or my tech will take care of it.

Does anyone have any recommendations on where to get it from? I have checked the typical stores I've seen here online but haven't had any luck. The part number I believe is 0051537228.
$55.20 on www.genuinemercedesparts.com It lists it as being for the S600 and S65 but if you give them your VIN number when you order they will ensure the part is for your vehicle and if not, replace it with the correct part number... I have order quite a few items from them... Just don't try to have any hazmat items (e.g., transmission fluid or oil) shipped, as they won't do it...
Last edited by 06E55; Jun 20, 2010 at 07:58 AM.
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Old Jun 20, 2010 | 08:01 AM
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Originally Posted by Hammer Down
I'll keep a look out, but the only street race that I have had in my car was against that Z06. I know that there are bunch of wantabee's out here S430 AMG, S550 AMG, E350 AMG
I saw an S550 AMG on Friday. Didn't even have AMG wheels!!! I just broke out laughing as it drove by. I was in front of Duke University Hospital when he drove by. People were looking at me kind of funny
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