Car still slow after MAS change

PeterE320Cdi

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S210 E300 DT, XC60 Past Cars: S210 E320 CDi (rusted into the ground), CLK 240
My E class has been getting slower and slower so having read the various MAS/MAF posted I decided to get a new one from the Mercedes dealer. Fitted it last weekend and the car was better but still not as it should be.

If I floor the accelarator it kicks down but will then change up at about 3,500 revs where before it would not change till around 4,500.

Do you think I should take the MAS back and ask for a different one or are there other common problems I should check?

Cheers, Peter.
 

KLP 92

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It will be a MB Pieburg one ;)

Check for air filter blockage, cat blockage, leaking turbo pipes, EGR Valve and inlet port motor. Did i miss anything :D
 

television

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It will be a MB Pieburg one ;)

Check for air filter blockage, cat blockage, leaking turbo pipes, EGR Valve and inlet port motor. Did i miss anything :D
My reason for asking was that there are some odd make replacements out there that do not last 5 mins
 

Dieselman

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Measure the voltage from Pin-5 of the MAF, just under 2V at idle and approx 4.5v at full revs.
Being a parts jockey will just get expensive with no reward.

I'd go with blocked cat if it has one.
 

KLP 92

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My reason for asking was that there are some odd make replacements out there that do not last 5 mins
Its says in the 1st post about acquiring it from a MB dealer :D

I have the same car, i bought a MAS from MB and its Pieburg so i assume they're the same!
 

tuikku

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Finland
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Leaking vacuum system ?
Pressure converters ?
What is boost pressure level ?
Power increases “hand in hand” with boost pressure.
If pressure don’t reach max level, power neither.

What about smoke ?
If boost pressure leaks, mostly there are lot of smoke too.

If there is nothing in “false memory”, and no smoke.
It might be some kind of boost pressure-problem.

Maybe “learning “ transmission learns to change earlier, when it sees, that engine have poor power.
When you get the power back, the transmission will be ok, too.
 

television

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Its says in the 1st post about acquiring it from a MB dealer :D

I have the same car, i bought a MAS from MB and its Pieburg so i assume they're the same!
Yes I re read it last night so the fault will be else where and Dieselman could be right with blocked CATs
 

Bazzle

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SLK230 1998 auto, 2006 W169 A200 Sport
Drive it real hard for a the next few starts and see if its just adaption.

Bazzle
 
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PeterE320Cdi

PeterE320Cdi

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S210 E300 DT, XC60 Past Cars: S210 E320 CDi (rusted into the ground), CLK 240
Thank you everyone for the advice. I went on a 60 mile drive yesterday and it has cured the problem. I can not think why a longer drive would have sorted it so fingers crossed its not an intermittent problem.

Cheers, Peter
 

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