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#1 Old 11-10-2017
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Unhappy SLK Perfomance and MAF

Greetings SLK World.

My 2002 SLK200 Kompressor is not happy with life. A month or two ago, I had some stuff done. While the car was at the mechanic for ball joints, he read the diagnostics a few times. Misfire on all 4 cylinders.

I couldn't do anything then about the MAF. I haven't been driving that much recently since I moved onsite at our campus. Last night, after a concert, I decided to take the highway. Headed down the on-ramp getting up to 120kph, but it just felt sluggish. I eased off and got up to about 125kph and cruised for a bit. I then headed up to 140kph. Then 160kph or so. However, through out that, it just felt "meh". Imagined something strangling the car but it was still going. It just not feel like a car like this should feel.

Earlier, I attached a friends wifi ODBII scanner and used OBD Fusion to read codes. P0101

Been looking at some threads about cleaning the MAF sensor etc and possibly replacing the sparks and coils. I get roughly 16l/100km

What should I do, step form, cheapest > most expensive, to try resolve this?

Thanks in advance.
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#2 Old 11-10-2017
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Change the spark plugs, clean the MAF and reset the codes. Might not solve the issue but it could, it's cheap and good general maintanance.
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#3 Old 11-10-2017
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I'd be using an ODB dongle and Torque Pro on an Android tab or phone and display fuel trim 1&2, long term fuel 1 &2, the lead O2 sensors bank 1 sensor 1 and band 2 sensor 2, MAF flow, manifold pressure (MAP), coolant temp, total advance, and throttle position (may take two screens on a phone but can log). If you are not feeling misfire then it must be tune related. That code you show is "pending" which means the computer has recorded an anomaly but was fleeting and not long enough to make a fault.

If that doesn't work next step is to check the fuel rail pressure and do a compression or leakdown test.

Or you can just throw parts and money at it (Bosch MAF is over $100) and hope it feels better.
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#4 Old 11-10-2017
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When you clean the MAF try and clean the pipework too.

If you don't and oil has collected you may have to clean the MAF a second time.

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#5 Old 11-10-2017
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It's important to know that many fault codes tell that a value is out of range, but doesnt explain why. Here, the measured air mass value isn't what the ECU is expecting, no more but OTOH, no less. This means that a Engine that is slightly out of tune may create this condition. Therefore, making sure that the car is "in shape" is a good idea.

I would check spark plugs, compressor belt tension (belt, tensioner), check for clogged engine ventilation, check the fuel filter (old, new, when was it changed?) - basically do whatever it says in the service sheet (and by all means, check tyre pressures... this is not a complete joke ). Given the high consumption, I would check actual engine compression at same time as spark plugs is out.

If all this check out "good", fine. THEN, I would clean or worst case, renew the MAF.
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#6 Old 11-21-2017
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Hi peeps,

Sorry, haven't been around to check back here, sorry.

Got pricing on the MAF sensor (OMG), 4 spark plugs and ignition coils. MAF Cleaner is cheap as are the spark plugs. How many ignition coils does this engine need? Getting different stories, 2 that covers 4 cylinders or 4 to cover 4 cylinders?

Thanks in advance,
James.
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#7 Old 11-21-2017
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Obviously try the cheapest (free) things first - as the guys said above, make sure the engine can breath (check air filters, check throttle body for debris, clean throttle body). Check fuel filter.

I had good results from using a spray can of throttle body / air intake cleaner (my throttle body mesh was very dirty).
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#8 Old 11-21-2017
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Quote:
Originally Posted by JamRogZA View Post
Hi peeps,

Sorry, haven't been around to check back here, sorry.

Got pricing on the MAF sensor (OMG), 4 spark plugs and ignition coils. MAF Cleaner is cheap as are the spark plugs. How many ignition coils does this engine need? Getting different stories, 2 that covers 4 cylinders or 4 to cover 4 cylinders?

Thanks in advance,
James.
Did you search?

Mercedes Benz SLK Forum - Search Results for Coil packs R170 200

Sometimes quicker than waiting for the correct expert.

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#9 Old 11-27-2017
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Hello peeps,

So yesterday I went outside to clean the MAF sensor after getting some LiquiMolly MAF cleaner. While waiting for a mate to bring tools, I was checking the engine over. Well, I found a rat's nest in between the fuse box, ESP computer and I think the master brake cylinder maybe. I cleaned it out and found that the rats removed the foam stuff around the "snake" of wires. They also ate through the brown wire heading to the ESP box. So that's going to a mission to sort out.

Anyway, in regards to the MAF sensor. Well, um, it's not there. It looks like it was removed by previous owner because he couldn't afford a new one. There is a pipe where the MAF should be and the cables for the MAF sensor are nowhere to be seen. This is incredibly disconcerting. Maybe it explains the massive fuel consumption?
I'm at work, I have WIS on my home PC. Would WIS give the actual part number for the MAF sensor? I have found on our local version of eBay:

https://www.bidorbuy.co.za/jsp/item/...deId=311602526

Apparently a new one is ZAR6000. This one is under R1000, so I'm a bit worried to order it.

Thanks,
James.

PS. Sorry if pics are huuuuge.
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#10 Old 11-27-2017
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WIS not EPC yes.
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#11 Old 11-27-2017
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Since I just bought an OEM Bosch for $105 on Amazon for my 320, I'd say 6000R (over U$400) is a bit steep. Unfortunately they did not sell the 200 here, is the MAF the same as a 230 ? 000 094 09 48


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#12 Old 11-27-2017
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Hi. Thanks.

I just spoke to the dealer. The wiring harness is ZAR5500 for part number A1705403907. I did however find another part number (A1705407805) that costs R12500. He got that from EPC based on my VIN. And a MAF sensor is ZAR4571. Engine mountings for ZAR5000 and I even asked about that thing that goes at the front of the engine with MB logo on it, ZAR281!!! Yay! Only ask because there is a tiny piece missing and I'm battling to clean it.

Has anyone repainted the spark park cover thing that says KOMPRESSOR on it? What should one use?

Thanks,
James.
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#13 Old 11-27-2017
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Buy a used one from eBay, I had some trouble with my maf full story here:
https://www.slkworld.com/slk-r171-gen...4-05-48-a.html
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#14 Old 11-27-2017
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The problem with a dealer is that with MB in the middle the price is at least double the jobber price (Amazon) for an OEM Bosch sensor, at least in the US.

Sometimes it is hard to remember that in Europe the MB is a full line producer of cars like GM with models that range from Aeros to Cadillacs, they just do not bring the economy cars into the US (though seeing a lot more trucks than we used to).

Am not kidding when I say they make the world's best taxicabs. There is just this mystique in the US that they are "more" (and have seen them do some pretty dumb things).

That said there is no one more fanatical than a convert and am a GM trained (GMI now Kettering) automotive (mechanical & electrical) engineer and from 1978 to 2012 all of my personal cars were GM.

Point I am making is that there is nothing wonderous about the MB compared to any other manufacturer. They are a collection of parts, some made inhouse but many from suppliers and in general the suppliers use as many off-the-shelf parts as possible to keep costs down. MAF sensors are one such, O2 sensors another. Where MB gets annoying to me is the whole proprietary DAS/Star/EPC/WIS/ASRA business that seems designed to force customers to dealers. The entry point to the game seems to be about $700 or more than the price of a set of tires.

Strange thing is that I find more actual documentation for my SLK on the Crossfire site than here. Not sure why but mention of documentation from evil bay seems Right Out.

Bottom line the MAF is a precision item that is used in the millions & should retail for $50-$100 (less if you could reuse the housing). Anything else is just more layers of profit takers but during a downturn, service is what keep dealers in business so manufacturers want to keep captive. However in the US, various regulatory agencies say that is a no-no (started back in the seventies when GM was forced to offer a "radio accommodation package") so the manufacturers (and their lawyers) try to keep as much service information as possible proprietary (one way or another I have service manuals for all of my cars, any more I prefer electronic). It is out there even though the moderators seem to take a dim view of some of it getting out. Is that a Canadian thing ?

ps see "Steamboat Willie"


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#15 Old 11-27-2017
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No MAF sensor? How did this engine run at all? Maybe the rat ate it? The previous owner was trying to save money?

ROTFLMAO.

Replace the MIA with a sensor used or new, and your problem is solved. If the plugs are cheap, then replace them. There isn't any reason to replace the four coils, but you can run a simple test on them. With the engine running, just disconnect the coil. If the engine RPM drops significantly, the coil is OK. Also plug wires are cheap so replace them.

I think your problem is you need to learn to perform inspection routinely under the hood! Also get some rat traps!
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#16 Old 11-28-2017
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Hello,

So I got WIS up and running last night after a function. Entered VIN and searched for mass air flow sensor. Results came up, picture shown. The MAF sensor is in a different location than depicted in the YouTube I watched. So I went outside, opened the bonnet, looked where WIS said it is and boom, there it is! It's further up the pipe than suggested in the video.

One thing I read online (could be wrong) said that it can run, but is really bad for the engine and can damage the catalytic converter. I'm pretty sure the previous didn't really care for the car at all

I do check quite often, I think the rats made their nest on Friday night when I came home late and the engine was warm and the rats were wet/cold after the heavy downfall. The wires leading to the ESP system that were chewed through were underneath a lot of rat nest, so I'm assuming it happened on Friday night. The ESP lights only came on on Saturday.

So later this afternoon, I'll try do the MAF cleaning.
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#17 Old 11-28-2017
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The car will run with no MAF on a default petrol map. In this instance, the afr is not 14.7:1 = Stoichiometric, you will most like run rich, and from here your big fuel consumption.
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#18 Old 11-29-2017
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Took out the MAF yesterday. Friend was helping and he broke one of the brackets that the screws go through. Epic fail. He's put epoxy on it and left it to dry over night. I'll then clean it (wasn't particularly dirty) and put it back and test. Really don't want to buy a new one right now.
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#19 Old 11-29-2017
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Did the mirror look scratched at all?

This can cause more issues than oily residues.

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#20 Old 11-29-2017
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The epoxy has worked pretty well. I have sprayed the MAF cleaner on it and left it to dry. I'll check again when I get home later. Might spray again or just install straight away.
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