320 clk MAP sensor location - Mercedes-Benz Forum
 
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#1 (permalink) Old 04-28-2011, 07:59 AM
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Question 320 clk MAP sensor location

Hi
The car is a UK sppec 1999 320 CLK. I wish to rreplace the Mainfold Pressure Sensor ( MAP ) could any one Please give me a presise location of where this is located. I have looked not too closly but cannnot see. The engine does not rev after idle & in drive. So I suspect this is a possible fault. If some one has a picture with an arrow. That would be Brilliant.

Thank you in advance
Steve
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#2 (permalink) Old 04-28-2011, 11:22 AM
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Steve - are you referring to the 'air pressure sensor' (for M33 air pump)?

If so it is B28, and is shown here on my M112 engine with the cover removed. Your W208 will be similar as you have the same engine.

Had your codes read? This problem could be many things......
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File Type: pdf M112 B28.pdf (130.6 KB, 405 views)
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#3 (permalink) Old 04-28-2011, 11:41 AM
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Hi
Thank you for the reply
The picture have sent is completly different to my engine bay.
My CLK is a 1999 320. The fault is that the engine starts, place it in drive put your foot on the accelerator & the engine does not rev above idle & therefore no drive forward. I have considered that the possible fault are MAP sensor & throttle sensor. The car is a UK spec so I have looked at Eurocarparts typed in the reg & found the part number for these two parts. The throttle sensor or air mass / flow meter is easy to find, but I could not find where the MAP sensor is located, based on the picture that euro has on their web site. The car is my wifes so a complete inconveinience being faulty. I will replace these two items & there go from there really.
Thank you
p.s I think its time for it to go - been a real pain lately
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#4 (permalink) Old 04-28-2011, 12:21 PM
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Quote:
Originally Posted by stevetyler View Post
Hi
Thank you for the reply
The picture have sent is completly different to my engine bay.
My CLK is a 1999 320.
I know, But it is an M112 V6. Same as mine, but my bores are a bit smaller for the 2.6 litre capacity. It should look very similar. I took a look at what Eurocarparts call a MAP, and it looks identical to the B28 I showed on my engine. Can you post a picture of your engine from the same angle as mine?

Quote:
The fault is that the engine starts, place it in drive put your foot on the accelerator & the engine does not rev above idle & therefore no drive forward. I have considered that the possible fault are MAP sensor & throttle sensor. The car is a UK spec so I have looked at Eurocarparts typed in the reg & found the part number for these two parts. The throttle sensor or air mass / flow meter is easy to find, but I could not find where the MAP sensor is located, based on the picture that euro has on their web site. The car is my wifes so a complete inconveinience being faulty. I will replace these two items & there go from there really.
Thank you
p.s I think its time for it to go - been a real pain lately
I still think that the best route is to get the codes read, rather than changing parts willy-nilly. Can you get hold of a code reader?
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#5 (permalink) Old 04-28-2011, 12:41 PM
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Hi Again
Digital camera broke - do not posess a code reader. Going by the nature of the symptoms I beleive it to be these parts one or both. Car now 12 yrs old these parts have never been changed. If this does not work then I will need to get in touch withh my Merc mechanic, who is on Hols at mo.
Incidenly I must ask, what is your 240 like? I am considering a Px. Had this car 5yrs & things are starting to become a pain. Fueling ECU went fault earlier this year, gearbox problems, now this. Been looking at 240's What are they like to live with. Probably a stupid question to ask. But you can probably sence I feel like throwing a brick at this CLK. I think now the car is getting older it is going through adolesance!
Cheers
Steve
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#6 (permalink) Old 04-28-2011, 03:09 PM
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Incidenly I must ask, what is your 240 like? I am considering a Px.
Best car I've ever had! I've hardly spent any money on this car, apart from tyres, oil, wipers, etc. No major failures.

What I have realised since my 'innocent' purchase of this CLK 240 in 2006 is that it has a number of advantages over some other MB models.

1. Much better steering design than the W208. Rack & pinion. (no drag links, pitman arm. No steering damper.
2. All electric door locks. No pneumatics at all.
3. Straightforward suspension. No ABC like the MB luxury models.
4. After 2003/4 better rust resistant steel. No sign of any rust on my car yet.
5. 5-speed gearbox. Free of the ills of the later 7-speed.
6. The CLK 350 has some engine issues. (balance shaft)
7. Enough power for the UKs roads.
8. Mine was fully loaded by the original owner & had hardly been used. (foreign diplomat) COMAND, heated seats, etc, etc.
9. With the rear seats folded down, it will take quite big loads.
10. No Kompressor complexity.
11. Bullet-proof M112 engine.

I realise that the 2.6 litre engine might have been a tad small for the US market - that's why it was never sold there. But MB USA want to maintain their cars as high-end prestige models only. For me, this is luxury transport at a moderate cost. I reckon it's a keeper - not sure who will last longest, me or the CLK!

Btw, I know Hornchurch very well - I went to school there...
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#7 (permalink) Old 04-29-2011, 01:22 AM
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Unhappy

Hi Again
Sorry to sound a bit negative from my previous mail. The CLK 320 is a nice car as they all are I presume. But I find it very frustrating when they go wrong from an engine of managment point of veiw. No workshop manual. No help from the dealers. Specialised engine managment (star) sofware reqiuired to interogate car. In other words the systems are desiged from my point of veiw, that the average owner cannot work on them. MD made enough of these cars, so why not a manual. I am very capable of working on & dianosing engine managment systems ( Jaguar V12's ) but with a car where I do not know where the various sensors etc are sited & not likely to be told, a bit of a pain. Upon looking at the Euro web site, as mentioned typed in reg looked for MAP sensor - ordered - now I find out that I dont think the car has one! So I am just going to replace the Air flow meter & then humbly speak to a Merc tech. I supose due to your CLK not going wrong, you have not experienced the same frustrations? I would like to exchange the CLK for probably a E Class 240 V6. However I may even change the car for another German model. But make sure that a workshop manual is available & diagnostic equpiment is available. Have a nice W/E - Steve
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#8 (permalink) Old 04-30-2011, 06:32 AM
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1999 CLK320 - engine idles - does not rev up!

Hi
Could you Please tell me where the throttle body exists? I have replaced the Air flow meter. But I am not convinced that this has totally cured the fault. Do I have to remove the inlet manifold? The throttle body itself, is it a Electronic part or just a Butterfly? The car was perseived to have a MAP sensor, but I cannot find on the engine. Could any one Please post me any pictures?

Thank you in advance
Steve
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#9 (permalink) Old 05-01-2011, 03:49 AM
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Steve - you said that the car 'does not rev'. So what happens? It just stays on idle?

I believe that your W208 model has a throttle cable from the floor pedal. (My W209 has an electronic connection here) Take a look at this drawing for your engine (112.940) which shows the position of the throttle shaft in 2 extreme states:

CTP = closed throttle position. WOT = wide open throttle

With the engine switched off, get someone to tread on/off the throttle pedal, and see what is going on here. That's a start on this issue. If that is OK, maybe there is a problem with the fuel injection system? Fuel filter? Fuel pump? They can all affect the engine performance.
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File Type: pdf W208 throttle control.pdf (145.8 KB, 223 views)
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#10 (permalink) Old 05-01-2011, 08:51 PM
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Quote:
Originally Posted by stevetyler View Post
Hi Again
Sorry to sound a bit negative from my previous mail. The CLK 320 is a nice car as they all are I presume. But I find it very frustrating when they go wrong from an engine of managment point of veiw. No workshop manual. No help from the dealers. Specialised engine managment (star) sofware reqiuired to interogate car. In other words the systems are desiged from my point of veiw, that the average owner cannot work on them. MD made enough of these cars, so why not a manual. I am very capable of working on & dianosing engine managment systems ( Jaguar V12's ) but with a car where I do not know where the various sensors etc are sited & not likely to be told, a bit of a pain. Upon looking at the Euro web site, as mentioned typed in reg looked for MAP sensor - ordered - now I find out that I dont think the car has one! So I am just going to replace the Air flow meter & then humbly speak to a Merc tech. I supose due to your CLK not going wrong, you have not experienced the same frustrations? I would like to exchange the CLK for probably a E Class 240 V6. However I may even change the car for another German model. But make sure that a workshop manual is available & diagnostic equpiment is available. Have a nice W/E - Steve

In the US, manuals are available. MB USA sold me a Star Classic Service Manual on DVD in 2005. Back then it was under $100. I simply called MB USA at the 800 number and told them what I wanted. I had it in less than a week. Perhaps MB UK at 00800 9777 7777 can supply you with similar software. Also, the WIS is also a nice option. I got one in 2005 and another in 2007. Both my copies of the WIS were bought on Ebay, and they were quite inexpensive. The only downside is they only work under MS XP.

A simple code checker takes a lot of the work out of diagnostics. I picked up one in 2005, and it was about $50. They've gone up in price and are in the $80 range now. My code checker will list everything here. I got my code checker from Manuals Unlimited.

A couple of tools (manuals and the checker) takes all the guesswork out of repairs. I hope that helps.
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