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  #1  
Old 03-21-2006, 04:27 PM
BENZ-LGB's Avatar
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Misssing sensor help

Greetings:

I would like to hear from some of the experts ont he M103 engine regarding a what appears to be a missing sensor in my 19898 300TE's engine.

I recently took some pictures of the engine bay (see my post in the detailing section) when I noticed an open hole in the place where the "air intake pressure sensor" should be (the Benz manual refers to it as the "air temperature sensor.").

Coincidentally I was looking at pictures of DanWatt's extremely clean engine compartment (for his 300SE) and I noticed that his engine, which is essentially the same as mine, sans the grime does have a sensor attached to the plastic portion of the air intake cowl (leading directly up to the air cleaner).

I then checked the BENZ CD manual for my 300TE and indeed mine issupposed to have one. In fact, the manual states that in older M103 engines, an air temperature sensor MUST BE retrofitted. The CD manual goes on to state that the connectionis built into the engine wiring harness and can be found by looking under the air cleaner.

I have not looked for the connections in mine yet. I will do that this weekend.

What I would like to know is what, in any, effect, the missing sensor may have on engine driveability. MOre specifically, my 300TE has suffered from occasional engine cutting out during coasting. Would the missing sensor have anything to do with it?

I can't now recall when the sensor went missing...all I know is that it isn't there now.

Thank you for all your help.

I have attached pics for you to see what I am referring to. The first is of my 300TE's engine compartment. The second pic is of Danwatt's car (taken from his post in BenzWorld). I tried to do "signs and arrows" but at this point my knowledge of PhotoShop is rudimentary and my teenaage son is at school now and cannot help me.

Now that I see the pics, they are awfully small. Does anyone know how to do attachments as URL's? To show bigger pictures? Thanks.
Attached Thumbnails
Misssing sensor help-airpressureintakesensor300te.jpg   Misssing sensor help-airintakepressuresensor.jpg  
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Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

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Last edited by BENZ-LGB; 03-21-2006 at 04:33 PM.
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  #2  
Old 03-21-2006, 04:34 PM
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The air intake sensor started in 1990 on USA cars...Federal & California versions
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  #3  
Old 03-21-2006, 04:46 PM
BENZ-LGB's Avatar
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Missing sensor....

I had read something similar to that.

But then I read in the Benz CD manual where the sensor is supposed to go into cars from production date 02/86 and on. For cars that did not come equipped with the air temperature sensor, the manual states that one MUST be retrofitted (it even gives directions on where to find the wiring for it).

It is all sort of confusing.
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Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

Res non semper sunt quae esse videntur

My Gallery

Not in this weather!
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  #4  
Old 03-22-2006, 08:43 PM
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Quote:
Originally Posted by BENZ-LGB
I had read something similar to that.

But then I read in the Benz CD manual where the sensor is supposed to go into cars from production date 02/86 and on. For cars that did not come equipped with the air temperature sensor, the manual states that one MUST be retrofitted (it even gives directions on where to find the wiring for it).

It is all sort of confusing.
OK...bump.

I would like any member who owns a 1989 vintage E series Benz, with the M103 engine, to check and see if yours has the air temperature sensor (or air intake pressure sensor) attached to the intake cowl.

I am sorry that the pics that I posted are so tiny, but the sensor is located by the air intake cowl, right before the cowl goes into the air cleaner housing.

For ease of reference, and clarity, I have attached a link to the MB Repair CD. The sensor is item No.: B17/2.

http://mb.braingears.com/124_DISC1/Program/Engine/103/09-1051.pdf

Your help will be greatly appreciated.

PS: Also read the notes that state that in pre-1986 vehicles, the sensor MUST BE retrofitted.

Thanks in advanced.
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Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

Res non semper sunt quae esse videntur

My Gallery

Not in this weather!
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  #5  
Old 03-23-2006, 02:19 AM
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Anyone?

Anyone??

Anyone???

Do I need to change this post to: "I need help with my Buick" before I get any takers?
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Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

Res non semper sunt quae esse videntur

My Gallery

Not in this weather!
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  #6  
Old 03-23-2006, 08:38 PM
BENZ-LGB's Avatar
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Almost 100 views....

...and no response???

Someone here must have a 1989 Benz with a M103.XXX engine, so he/she can check whether there is a sensor attached at the intake cowl, right before the air cleaner housing.

Help...por favor
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Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

Res non semper sunt quae esse videntur

My Gallery

Not in this weather!
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  #7  
Old 03-23-2006, 08:57 PM
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Looks like you may have to offer a reward ( case of beer ) or something.
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  #9  
Old 03-24-2006, 12:38 AM
BENZ-LGB's Avatar
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and the case of beer goes to Arthur.

It would then appear that the 1989 300TE (my car) does require an air temperature sensor.

I suppose that the next question would be what effect, if any, does a a missing sensor have onthe car's driveability? And, would the occasional engine cutitng out that I have experienced, while the car is coasting, be related to the missing sensor?

Anyone?

Anyone??

Anyone???
__________________
Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

Res non semper sunt quae esse videntur

My Gallery

Not in this weather!
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  #10  
Old 03-24-2006, 01:38 AM
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There's no sensor on mine, build 10/88.
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  #11  
Old 03-24-2006, 01:48 AM
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Lightbulb Replace the sensor.

Quote:
Originally Posted by BENZ-LGB
and the case of beer goes to Arthur.

It would then appear that the 1989 300TE (my car) does require an air temperature sensor.

I suppose that the next question would be what effect, if any, does a a missing sensor have onthe car's driveability? And, would the occasional engine cutitng out that I have experienced, while the car is coasting, be related to the missing sensor?
Replace the sensor, and test drive.




Have a great day.
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  #12  
Old 03-24-2006, 11:18 AM
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Quote:
Originally Posted by BENZ-LGB
and the case of beer goes to Arthur.
Arthur is too young to drink.
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  #13  
Old 03-24-2006, 11:58 AM
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Quote:
Originally Posted by manny
Arthur is too young to drink.

Arthur WISHES he was too young to drink !!!!!
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  #14  
Old 03-24-2006, 12:17 PM
BENZ-LGB's Avatar
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Join Date: Apr 2001
Location: Southern California
Posts: 1,663
Quote:
Originally Posted by manny
Arthur is too young to drink.
OK, then a case of soda pop...or a case of Geritol...whichever works best.

Manny, I do like your signature line. I hate it when people ***** about their Benzes.

Is not like we are living in a communist country and there was NO choice...
__________________
Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

Res non semper sunt quae esse videntur

My Gallery

Not in this weather!

Last edited by BENZ-LGB; 03-24-2006 at 08:45 PM.
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  #15  
Old 03-24-2006, 12:20 PM
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I think the whiners have been resting for the last couple of days.
Btw. just picked up the April issue of Car & Driver magazine.
They had a long-term test Acura.
What a nightmare.
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