Help needed! C180 Kompressor 55reg W203 auto

[Arudge]

I'd just found your pump is different to mine, never mind!

The idea of checking the vacuum at the brake servo is because the brake servo is at the end of all the pipework and any one way valves. Checking the vacuum at the brake servo effectively tests the whole line.

Know you know what the vacuum feels like at the pump, try it again at the brake servo, is it the same?

 

[Xtractorfan]

Cleaning MAFs is like washing your car on a wet day, drive it down the road and its dirty again....... Get the codes read and replace the maf with a new one or one that is known to be good.

 

[Dave wood]

I'd just found your pump is different to mine, never mind!

The idea of checking the vacuum at the brake servo is because the brake servo is at the end of all the pipework and any one way valves. Checking the vacuum at the brake servo effectively tests the whole line.

Know you know what the vacuum feels like at the pump, try it again at the brake servo, is it the same?

Ok had a read of that and I have to say it's an eye opener to say the least definitely glad u sent that!

Always the way lol. Yeah I'm with u, I'll have a look at the break servo tomorrow, I'm looking for around the same amount of vaccum I take it?



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[Dave wood]

Cleaning MAFs is like washing your car on a wet day, drive it down the road and its dirty again....... Get the codes read and replace the maf with a new one or one that is known to be good.

Lol.. If it needs to be replaced I will get it dine sharp!

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[Arudge]

I'll have a look at the break servo tomorrow, I'm looking for around the same amount of vaccum I take it?




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Yes

 

[star]

Get it to a proper mb specialist with a star, guess is costing you money. it will have lower rev limiter when revving in neutral or park.

 

[Dave wood]

Yes

Thanks Arudge much appreciated!

I'll let u know how it goes for sure

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[Dave wood]

Get it to a proper mb specialist with a star, guess is costing you money. it will have lower rev limiter when revving in neutral or park.

It would be nice to get it running as it should be! Any ideas to how much it would be for the star?

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[Dave wood]

Get it to a proper mb specialist with a star, guess is costing you money. it will have lower rev limiter when revving in neutral or park.

Yeah it's cost a bit as I've had to pay out when the garage should have done the job! I wouldn't recommend them to fix a lawnmower let alone anyone's car!

I have to say baring being like a bare with a sore head for the last 2 days I've enjoyed doing it, I've enjoyed the learning and speaking with other people finding things that I never knew were there and the reasons! So all in all its been educating and fun.

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[Dave wood]

Ok... So when cold the car runs open loop from the ECU map with no correction from Lambda. As it warms up it will switch to closed loop where it feeds back information from the lambda sensor to correct the mixture.
So... The lambda could be bad giving spurious values to the ECU.
There could be an air leak as Andy suggests which is screwing the mixtures when warm but not cold (when mixtures are already set rich).
I think I'd be getting the codes read properly on an MB reader but as a first step listen carefully for any vacuum leaks.

LostKiwi please forgive me I have literaly just seen this! I don' want u to think i ignored u! Again my apologies I hope i havnt offended

 

[Frontstep]

Masochists often have Mercedes check maf with voltmeter and rule it in or out.

Good luck.

 

[Dave wood]

Masochists often have Mercedes check maf with voltmeter and rule it in or out.

Good luck.

I have a multimeter and I will definitely be looking at that in the morning!

I Have asked star how much it would cost for the star dyagnostics, just waiting to see what he says, but in the mean time I can still keep Looking and if i can find the issues before it's tested then great stuff!

Many thanks frontstep

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[star]

It would be nice to get it running as it should be! Any ideas to how much it would be for the star?

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No charge for regular customers or £35 for drop ins (or its included as part of any repair we may do), this drop in charge is to deter "other specialist" sending their customers in as they haven't invested in genuine Star Diagnostics and are trying to get it done and the info for free via their customers.

 

[Dave wood]

No charge for regular customers or £35 for drop ins (or its included as part of any repair we may do), this drop in charge is to deter "other specialist" sending their customers in as they haven't invested in genuine Star Diagnostics and are trying to get it done and the info for free via their customers.

That's a very smart thing to do! I don't blame u either and without sounding to offencive there are some slippery people out there lol
The car is mine registered to me at my address.

Ok well here's the issue I'm faced with I have no MOT! And I'm doing all I can to get this done so I'm in need of someone to be mobile with a star dyagnostics as I can't drive it anywhere other than an mot station!
Where are u based?

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[John Laidlaw]

Star is in Reading Dave

 

[Dave wood]

Star is in Reading Dave

Yeah a little to far for me I'm afraid lol.. I'm need a mobile star! Im gonna have a look to see what i can find around me But in the mean time I'm going out to the car soon armed with a new scope! And After the help I have received from the members here I have no doubt I will be able to do this! And if I do get a little stuck I can always come back to here for some more advice!

Hopefully I will be able to find the issue if I do I will definitely leave my solution here for others who come across issues

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[Dave wood]

So today's events of finding a vaccum leak didn't go well! When car was running I could hear a buzzing like sound and thought this could be a leak at the inlet manifold! So I removed the Airbox, rail, injectors, inlet manifold, checked for holes and possible fail points! Cleaned everything and all seals put it back together started her up and still the same issue!

Vaccum is strong at pump aswell as servo!

Now when I'm listening it seems like the sound is coming from the supercharger!?!?! I can only describe the sound like an a grey wasp in a jar! When acceleration is applied it gets slightly louder!

Would the supercharger affect the running of the car in anyway as in idle, acceleration and cause a misfire ???

Also while the car was idling it went into limp mode!

Other than that after extensively looking and eliminating all possible issues I can only come to the determination that it's the MAF!

Any thoughts?

She is going in to have dyagnostics tomorrow morning to source the issue, but if it is the case where it could be the supercharger then I have another one here now and I will go out and work through the night to get it done!

As u can tell i really need my car lol

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[Arudge]

Would the supercharger affect the running of the car in anyway as in idle, acceleration and cause a misfire ???

No. Your supercharger is rather basic and little more than a pair of rotors and a very simple gearbox. The noise you can hear is the rotors clattering, and is considered normal. It does not provide any boost at idle. On mine boost does not come in until 3200rpm, i wouldn't expect your to be any different.


Also while the car was idling it went into limp mode!

This is where we need to be careful with terminology. I suspect you've gone into shutdown which is what happens when you suffer chronic misfire. This is done to protect both the engine and the exhaust system, the latter which could be destroyed by the excess fuel being dumped into the system. In shutdown the engine will idle, but you'll get no response from the accelerator, in short your going nowhere.

Limp mode is completely different and gives you limited drive-ability. Limp mode is what you get when the car detects transmission issues.

Can you confirm which you have?


Misfire is a pain in the ar*e to track down. At it's extreme i can be caused by cam timing issues, which is what i've just sorted on mine. But more usually it's mixture related which can be mechanical failure (vacuum leak), or electrical (maf, bad connectors and or oil in the loom.

As you have checked the obvious, plugs, coils and leads, we need to dig a little deeper.

I'm not going to dismiss a vacuum leak just yet but i suggest you have a look at the plug that goes into the engine ECU, we're looking for oil or corrosion.

 

[Dave wood]

Would the supercharger affect the running of the car in anyway as in idle, acceleration and cause a misfire ???

No. Your supercharger is rather basic and little more than a pair of rotors and a very simple gearbox. The noise you can hear is the rotors clattering, and is considered normal. It does not provide any boost at idle. On mine boost does not come in until 3200rpm, i wouldn't expect your to be any different.


Also while the car was idling it went into limp mode!

This is where we need to be careful with terminology. I suspect you've gone into shutdown which is what happens when you suffer chronic misfire. This is done to protect both the engine and the exhaust system, the latter which could be destroyed by the excess fuel being dumped into the system. In shutdown the engine will idle, but you'll get no response from the accelerator, in short your going nowhere.

Limp mode is completely different and gives you limited drive-ability. Limp mode is what you get when the car detects transmission issues.

Can you confirm which you have?


Misfire is a pain in the ar*e to track down. At it's extreme i can be caused by cam timing issues, which is what i've just sorted on mine. But more usually it's mixture related which can be mechanical failure (vacuum leak), or electrical (maf, bad connectors and or oil in the loom.

As you have checked the obvious, plugs, coils and leads, we need to dig a little deeper.

I'm not going to dismiss a vacuum leak just yet but i suggest you have a look at the plug that goes into the engine ECU, we're looking for oil or corrosion.

Arudge as always ur insite is educating, helpful and very much appreciated!

Pain in the arse is an understatement! Lol, apart from a little frustration it has been fun

Currently my car is in the garage with dyagnostics to source the issue so by the end of today I will hopefully have this wrapped up!

I will let u know what's what when I know later today

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[Dave wood]

Would the supercharger affect the running of the car in anyway as in idle, acceleration and cause a misfire ???

No. Your supercharger is rather basic and little more than a pair of rotors and a very simple gearbox. The noise you can hear is the rotors clattering, and is considered normal. It does not provide any boost at idle. On mine boost does not come in until 3200rpm, i wouldn't expect your to be any different.


Also while the car was idling it went into limp mode!

This is where we need to be careful with terminology. I suspect you've gone into shutdown which is what happens when you suffer chronic misfire. This is done to protect both the engine and the exhaust system, the latter which could be destroyed by the excess fuel being dumped into the system. In shutdown the engine will idle, but you'll get no response from the accelerator, in short your going nowhere.

Limp mode is completely different and gives you limited drive-ability. Limp mode is what you get when the car detects transmission issues.

Can you confirm which you have?


Misfire is a pain in the ar*e to track down. At it's extreme i can be caused by cam timing issues, which is what i've just sorted on mine. But more usually it's mixture related which can be mechanical failure (vacuum leak), or electrical (maf, bad connectors and or oil in the loom.

As you have checked the obvious, plugs, coils and leads, we need to dig a little deeper.

I'm not going to dismiss a vacuum leak just yet but i suggest you have a look at the plug that goes into the engine ECU, we're looking for oil or corrosion.

I had it running at idle for a while to worm up I gave some acceleration and then limp mode! Very slow revs! Switched off engine left for a few minutes started her up and limp mode was gone!

The garage is less than 5 minutes away so Started her up this morning to go to garage drove there on limp mode and just waiting for a call from the garage now!

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