SLK MAF removal

[Pep]

I have read the wonderful guide at the top of this section, but as some of you will know things are a little different on the SLK.
I have removed top hose (oily muck dripping out) and released the 2 clips at the base, but no joy??
Am I missing some (difficult to remove) screws?

HELP!!! it's driving like a pig!!

97 SLK 230 K (just under 40k)

 

[Blobcat]

Is this problem the same as this one http://forums.mercedesclub.org.uk/showthread.php?t=19430
also just posted

 

[television]

Yes it is the same as the other thread, the oil finds its way down onto the MAF, there is a one way valve on the top of the engine that is supossed to stop this, but I think the compressor will have to be rebuilt and the oil seal replaced.

Malcolm

 

[Pep]

This doesn't sound too good !
Can anyone help with my MAF removal issue?
I am hoping to clean it to see if that helps.

 

[G MAN]

Hi pep we seem to have the same problem but as you say keeping the maf clean does help maintain performance.( I use a ISP spray from Maplins)From what you descibed you have removed the hose with the maf still attached and there should be 2 hex srews holding the plastic housing in place. These are easy to remove with the correct head then firmly rotate and ease the maf assembly out so as not to damage the o ring. Remove the elec. plug connector first!Sorry no pics. but you've got most of th eway there already.

 

[Pep]

Thanks G MAN I'll have a go tonight.
Someone at work told me to use Carb cleaner spray, Probably similar stuff?

 

[G MAN]

Meant to say I use an IPA spray- isopropyl alchohol- though electrical contact cleaner -Halfords - has also been okay'ed on other threads I've read. never used carb cleaner, seem to have read on here it's not recommende though they all do the same job, removing oily deposits Just dont poke anything in to touch or disturb the filaments/components in the casing as they are very sensitive.have also read that some Bosch mafs have replaceable internals through Bosch agents or Mercedes Commercial but I haven't gone down that road as my sensor is a Siemens- £300 at stealers but £99 ( now £89!!) through sbb parts on e-bay & absolutely spot on!

 

[Pep]

Hi G MAN;

Good News I got the MAF off and cleaned it.
Bad News It was ok for about 2 minutes!!

This morning it would hardly go at all!!
Misfiring, no power, wouldn't climb a hill, pulling out of a junction was a lottery!!!
I think the oily deposits in the pipes above are definately causing the problem and reading your thread, I'm fearing the worse.

Cheap parts for a '97 SLK anyone??

Does anybody know a good independent in the north west?

 

[Blobcat]

Time to buy a new MAF, don't touch it with you fingers and you should be ok. Are you still getting the oil into the MAF?

 

[Pep]

I had a new MAF just under 2 years ago.
Yes I am, I think that is the problem. i.e. the oil coming down the pipe from above!

 

[Blobcat]

2 yrs is not a long life, however oil contamination will kill it. You need to fix the oil leak then replace the MAF

 

[G MAN]

it could be the same problem I'm having with the kompressor leaking oil but you need a good honest indie to diagnose. I've heard of SPR in Stockport though I've no personal experience. Ypu could try it on at the stealers for a healthy check but I think you'll be getting chest pains when they give you the estimate. I'll update you on any progress I make

 

[Pep]

Thanks Guys, I appreciate the help.
I'll get it to the stealer for a diagnostic!

 

[Pep]

Got it into the local Merc Stealer to be told it will be Tuesday pm before they can have a look+ £91 an hour!!
I did manage to get a word with a mechanic and he said on the face of it the kompressor sounded ok, but we will see!!!

 

[G MAN]

The kompressor on mine also sounds o.k. & apparently only gets noisy when they are completely knackered. The problem is that the oil seals deteriorate ( before destruction) and this it why oil gets thrown around. Iwas told they spin at 25000 rpm!! All this info. I got from a very reputable & helpful indie in Leeds & he said this was now a common enough problem with the unit. So we are in the same boat. Grin & bear it (til it goes down totally) by recleaning the maf or take the advice & replace the kompressor .
I have e-mailed MBUK for their thoughts/contribution & will let you know.
I have also e-mailed Eaton to find if there is a UK agent who can refurb. as yet no reply to either.
There are a few second hand ones to be found but I'm not confident about that as you will never know the history & it is a very labour intensive job .So it all points to a new unit to be totally safe & they are just short of £1200.
Any one else's help or comments ??
Did you try SPR by the way?

 

[Pep]

I think I'd better seel one of the kids on e-bay!!
£1200!!
The car was so bad on Thursday, that It wouldn't have got to Stockport.
I just about managed the couple of miles to the Stealer.
They are getting it diagnosed on Tuesday, at that point (depending on what it is) I may pull it out and get to a more sensibly priced garage.

 

[G MAN]

http://forums.mercedesclub.org.uk/showthread.php?t=17505
This thread has been interesting reading, waiting on update!

 

[Pep]

Thanks G Man, I must admit, when I spoke to the mechanic at the Stealers he mentioned this valve as a possible cause.
Hopefully I will get a call from them tomorrow after the diagnostic, I will keep you posted.

 

[G MAN]

Fingers crossed ! Always worth getting a second opinion & let's hope it is the simpler fix. All & any info. will be of immense help. Ta!

 

[Pep]

Finally got a call from the $tealers, they had done my diagnostic and it reads;

'Investigate and report on loss of power, Carried out star test, no conclusive faults, visually checked actual valves, maf sensor all seems ok, took off maf sensor was oil contaminated, checked engine breather, checked valve no vacuum / blocked, checked both vacuum feeds from inlet area. no vacuum / blockage would cause engine to breathe into inlet and contaminate air mass. Requires check valve and 2 nozzle valves and new air mass sensor, also will require inlet manifold off and rubber hoses check'

Good news... no mention of Kompressor
Bad news........ The $tealer wants £839.59 to fix it!!!!!!!
£371.39 of which is to replace the maf!

If the oil leak is stopped, can I not just clean the maf??
Is the rest of the work anything major or is it something that a local garage maybe able to carry out??

Please help!!!

P.S. I tried SPR and he is fully booked until sometime in August!