C230 supercharger intermittent

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Andybowen38

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Joined
Jan 22, 2017
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14
Car
Mercedes Benz c230k
Hi new to all this ....
I have 2001 c230k was running fine when I bought it about 3 months ago but about 2 weeks ago the supercharger (sc) stopped and my car run like it was naturally aspirated.
Since I was due a service (service due message on screen) I fought I'd service it and after I reset service interval my sc was working again back to full power.
Then 200 miles later again sc stopped working...
After looking and testing under the bonnet I thought it's worth a shot to reset service interval again and what do you know I'm back to full power
My question is why do I keep loseing supercharger ???
And why does simply resetting the service interval solve my problem ???
Thanks in advance for replys
 
I don't understand the connection between resetting the service indicator and the S/C , unless the ECU engine parameters go into fresh learning mode once the service indicator is reset (which makes sense thinking about it), so that could be the reason. This also happens when the battery is disconnected. So, if you have a faulty MAF this can cause the S/C not to engage but by disconnecting the battery and reconnecting it the faulty MAF can operate for 200-250 miles and then disengage again as the ECU has carried out a fresh learning mode.

I'd take a punt on replacing the MAF.
 
If you opt to replace the MAF check the old one for oil residue. If there's oil, you've got a breather problem, blocked breather. Make sure you get a Bosch or a Pierburg MAF.
 
Will I damage engine if I keep running it until I can afford the parts ?? Didn't realise the price lol
 
Will I damage engine if I keep running it until I can afford the parts ?? Didn't realise the price lol

I can't imagine so. The best value Bosch MAF's are on eBay.de. Also, you don't need the complete MAF, just the sensor rather than housing with sensor.
 
If you opt to replace the MAF check the old one for oil residue. If there's oil, you've got a breather problem, blocked breather. Make sure you get a Bosch or a Pierburg MAF.

This is quite correct.

If you have oil on your MAF you have a problem that needs to be fixed, yes you can buy another MAF but it will only get covered in oil and trigger the ECU to shut the kompressor off again. You would possibly get the same result by cleaning the MAF sensor carefully.

To resolve the oil contamination you need to remove the fuel rail then clear out the blocked breather nozzils, theres plenty of wright up's inlcuding one I did to help you.

Blocked breather nozzles & oil on MAF DIY fix - MBWorld.org Forums

I would suggest you do this now, to avoid ruining your MAF as it should be okay with just a clean. If you have to buy a new MAF DO NOT BUY OEM you must have Mercedes or Bosch as others will fail trust me. IF your on a budget buy second hand genuine.
 
Cheers il have a look over weekend I got new Bosch maf so il keep you updated

Side note I now have EML code is p0410 secondary air pump
Which my car doesn't have due to being a kompressor
Local mechanic said could be o2 sensor
Apparently faulty readings from o2 sensor makes ecu fink the secondary air pump isn't workin
I will investigate as haven't found a correct solution on forums
Lots of people talking about the p0410 just no solutions lol
Cheers Andy
 
Cheers il have a look over weekend I got new Bosch maf so il keep you updated

Side note I now have EML code is p0410 secondary air pump
Which my car doesn't have due to being a kompressor
Local mechanic said could be o2 sensor
Apparently faulty readings from o2 sensor makes ecu fink the secondary air pump isn't workin
I will investigate as haven't found a correct solution on forums
Lots of people talking about the p0410 just no solutions lol
Cheers Andy

I'd ignore the fault code and dismiss a possible faulty O2 sensor until you have tried the MAF and cleared all the codes. Disconnect the battery for an hour or so first, that I always find effective. Ideally you should get a cheap code reader and check parameters like fuel trims etc.
 
Changed maf this morning can't disconnect battery as I don't have code for the radio but I have a obd reader coming should be here Monday apparently reads live data aswel so we wil see what I can read with that.

And maf looked clean no oil ..... did look like someone had been poking around that area tho one of the rubber hoses didn't line up with arrows/markers
 
Changed maf this morning can't disconnect battery as I don't have code for the radio but I have a obd reader coming should be here Monday apparently reads live data aswel so we wil see what I can read with that.

And maf looked clean no oil ..... did look like someone had been poking around that area tho one of the rubber hoses didn't line up with arrows/markers

Did the replacement MAF resolve the issue?

No oil, good news but you should consider replacing the breather hoses, PVC valve, T-piece and cleaning out the brass breather jets in the cylinder anyway. Doing that is probably the best bit of preventive maintenance one can carry out on these engines. It's a bit awkward but costs only a few quid in parts.
 
Supercharger works at minute but did before for about 100 miles so wil have to see what happens and cheers wil have to look into that
 
The advice re. MAF is sound and the first place to try.

My Jag XKR has a supercharger and I was forever getting the code telling me it was an Oxygen Sensor fault . There are 4 on the car, so quite a big bill looming, not to mention the problems with getting them off after several years.

Indie specialist advised it was the MAF which was faulty and was causing the O2 sensors to "throw" fault codes.

He was absolutely right ........ one new MAF later and no further problems.

Fit the new MAF, erase the code and run for a while.

Good luck,

Stuart
 
Code reader came yesterday I tested it and only fault was p0410 ( secondary air pump)
So have cleared that but supercharger stil not working new maf fitted hasn't cured problem
Any other ideas ?
Was going to change cam position sensor next
Cheers andy
 
Sorry to hear that. Since I encouraged you to buy a MAF I'm reluctant to suggest changing other parts but if you haven't replaced the MAF previously, trust me fitting a new one is still worthwhile - no consolation, I know.

What I'd do now is:

1. Check the wiring loom at the Air flap and the Inlet Cam Magnetic Adjuster - look for any possible breaks.

2. Check the 40amp fuse in the K40 Relay Module (mounted next to the ECU on l/h/s of the engine bay) and check for any burnt solder or dry solder joints.

3. Take a chance on replacing either or both the Cam Magnet and Cam Position Sensor.

Before doing any of the above, reset the dash service indicator or disconnect the battery for a half hour. Then see if the S/C is engaging.
 
Cheers for response
someone on another forum mentioned cam position sensor but wil check relay and general operation of s/c before spending any money lol

I have rung around a few Mercedes specialists and mostly everyone says they have no issues with s/c and that they are bulletproof
But 1 did mention something about re-learning a flap ????
Anyone no of or no how ?? Or even what this "flap" is even for ?
Cheers in advance andy
 
The 'flap' is the boost bleed valve or boost control valve for want of a better term. It's mounted to the right of the air filter housing and has a direct feed from the S/C, thus controlling boost pressure. The procedure for a relearn goes something like this:

1 When ignition is switched off press flap slightly past limp home
position.

90° position must be changed manually. The processor
shut-off delay has a duration of approx. 5 seconds.

2.Switch on ignition for approx. 15 seconds, switch ignition
back off again and wait for processor shut-off delay.

3. Switch ignition on for approx. 45 seconds, switch ignition
back off again and wait for processor shut-off delay.

The learn-in procedure for the recirculated air flap is then
completed.

I've never had to do the above so don't know if it works and the fact that I didn't need to do it would lead me to believe this is not your problem.
 
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Have checked all wires/relays/fuses and all appear to be fine

Will re-learn the "flap" tomorrow cheers for procedure jjj

If all this fails il have to go down the replace sensors road starting with cam sensor.
Have checked supercharger and it's unclutched.
Cheers for responses
Andy
 

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