clk 230k performance problem

[E55docsavage]

Hi,havnt done this for a while,hope someone can help??Bought a lovly 230k clk with full factory amg options 1 owner from new,only serviced at dealer.Silver with black leather 105k on the clock.Recently she,s become gutless!Checked the obvious things maf,breather aok.Even put on to a mates diagnostic machine.Came up with air flow flap problem(one bolted on side of air filter housing)but his bosch kit could electronically move the flap?Any ideas out there would be greatley appreciated.She,s a w208.Thanks Gary

 

[roofless]

have the super charger checked at 105mls its could be faulty but hopfully its not the case but worth a look

 

[bigasotonuk]

Hi,havnt done this for a while,hope someone can help??Bought a lovly 230k clk with full factory amg options 1 owner from new,only serviced at dealer.Silver with black leather 105k on the clock.Recently she,s become gutless!Checked the obvious things maf,breather aok.Even put on to a mates diagnostic machine.Came up with air flow flap problem(one bolted on side of air filter housing)but his bosch kit could electronically move the flap?Any ideas out there would be greatley appreciated.She,s a w208.Thanks Gary

I have heard of this particular fault before, but for the life of me cannot remember the solution.
I read it on the here somewhere though, so if you use the search facility you should come up with it.
Sorry its not much help, but at least you know it is on here somewhere, think it was on a C230K.

 

[jimsinessex]

Hi,havnt done this for a while,hope someone can help??Bought a lovly 230k clk with full factory amg options 1 owner from new,only serviced at dealer.Silver with black leather 105k on the clock.Recently she,s become gutless!Checked the obvious things maf,breather aok.Even put on to a mates diagnostic machine.Came up with air flow flap problem(one bolted on side of air filter housing)but his bosch kit could electronically move the flap?Any ideas out there would be greatley appreciated.She,s a w208.Thanks Gary

Is the kompressor clutch pulling in? I had the same gutless performance issue which gave the air flap fault code, replaced the air flap (actually it is a byepass/recirc valve) but no change.

The problem was found to be a lack of signal to the clutch from the ecu which had to be replaced. I imagine a failure of the clutch itself would give the same result. As I understand it the clutch is now available separately from MB. When my clutch bearing failed much earlier in the car's life the whole kompressor had to be renewed.
Returning to the ecu fault, the actual signal is an earth signal to the two pin connector under the plastic cover in front of the rocker cover. With the knowledge I have gleaned from this forum I would now investigate having the ecu repaired instead of forking out for a new one.

Hope this helps.

Jim

 

[E55docsavage]

Hi,fault now sorted,took to mb where diagnosed to find maf faulty.replaced with oem,car drives superb now.To all who read this stay away from aftermarket mafs!They are crap.Thanks to all who tried to help

 

[jibcl500]

How many times have I said on this forum only original MAF's work properly.

jib

 

[toosmooth]

I've got a 230k with exactly the same problem - undiagnosed as of yet, but it's ****** gutless and the more I drive it the more I'm convinced it's wrong - I had a C200k a few years back and it ****** flew compared to this one.

My question being - whats a maf? - is it the air flow mass sensor? (AMF?!) and how much would a genuine merc one cost with/without fitting.

really really appreciate the answer even though this is a an older thread.

cheers

PB

 

[David Nock]

Yes, air mass sensor. Can I suggest that you search under 'maff', because there must be hundreds of posts about this.
I think I've read that genuine MB ones are £70/80. I also remember that the posts say that Bosch parts are effectively the same thing as MB parts. DO NOT get a cheap one from somewhere else other than these 2 sources.

 

[E55docsavage]

Only buy a bosch maf merc charged me £250 ish .But you can buy them for £160ish elsewhere.Stay well away from aftermarket one,s.I found out the hard way!