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(Post Link) post #1 of 18 Old 18-12-08 Thread Starter
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Filthy MAP sensor as cause of MCSF?

Is it possible that MCSF error appears because the MAP sensor is filthy from soot in inlet manifold. What is the best method for MAP sensor cleaning.
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Re: Filthy MAP sensor as cause of MCSF?

yep it is possible. if the maf sensor is so clogged up that it can not read near accurately then it can cause a fault light to illuminate.

cleaning it has been covered a number of times on here, a quick search should bring up plenty finds but to save you time its roughly this: (from memory)

remove plug from MAF sensor
remove intake pipe from both sides of sensor housing
remove two torx screws (star shaped) from the top, sensor will then pull out CAREFULLY.
use electrical contact cleaner and a cotton swap to clean the metal plates of sensor, apply minimal pressure as it is very sensitive!
soak the housing in hot soapy water
allow to dry
refit in reverse order
it may benefit you to disconnect the car battery for half an hour to allow it to reset the ECU.


cleaning the MAF does not always work tho and is at your own risk.

Do you have other signs of a faulty maf sensor such as no power over a certain rev, verry sluggish, struggling to idle?

Any driving issues at all?


also, this thread really would have been better in the 147/156 area
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Re: Filthy MAP sensor as cause of MCSF?

I think he's referring to MAP sensor not MAF sensor, pressure sensor in inlet manifold, not air volume sensing.

cheers,

Mark
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(Post Link) post #4 of 18 Old 19-12-08 Thread Starter
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Re: Filthy MAP sensor as cause of MCSF?

Thank you for answers. I have idea to clean MAP sensor in inlet manifold. I remember one post dedicated to cleaning the inlet manifold and MAP sensor from soot, but I can't find this post...
Best regards from Dusan.
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Re: Filthy MAP sensor as cause of MCSF?

best way is to remove the sensor and soak in petrol. then rinse afew times with clean petrol.
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Re: Filthy MAP sensor as cause of MCSF?

my bad!
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Re: Filthy MAP sensor as cause of MCSF?

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Originally Posted by slysi16v View Post
best way is to remove the sensor and soak in petrol. then rinse afew times with clean petrol.
Or carb-cleaner.
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(Post Link) post #8 of 18 Old 19-12-08 Thread Starter
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Re: Filthy MAP sensor as cause of MCSF?

May I expect some performance boost and disappearance of MCSF error after MAP sensor cleaning?
Cheers. Dusan
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Re: Filthy MAP sensor as cause of MCSF?

Can anyone explain this a bit more my car has just developed the symptoms described. Lack of power from 1k to 2.5k after that goes like normal. It's a JTD 8Valve. Can you confirm which sensor is likely to be the culprit Maf or Map?
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Re: Filthy MAP sensor as cause of MCSF?

try unpluggin ur maf and taking it 4 a spin if its back to normal new maf needed
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Re: Filthy MAP sensor as cause of MCSF?

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Originally Posted by rhett71 View Post
Can anyone explain this a bit more my car has just developed the symptoms described. Lack of power from 1k to 2.5k after that goes like normal. It's a JTD 8Valve. Can you confirm which sensor is likely to be the culprit Maf or Map?
thanks
VNT actuator not closing.....maybe
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Re: Filthy MAP sensor as cause of MCSF?

As KGB, lack of boost till 2500rpm is often the maf sensor, the egr can cause a few probs and on the late 16v the dual port system in the intake manifold can also get clogged and seize open or shut, but the vnt controller can also fail and the turbo vains can also get clogged and stick.

unplugging the maf may help a little, if it does, start with the maf sensor.
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Re: Filthy MAP sensor as cause of MCSF?

Absolutely bob on!! Drives a lot better just takes 2 hours to get to the bloody plug!!!!
Anyways called Donalds at Peterborough and one's on it's way!!! Didn't realise they give you a 10% discount for being a memebr on here!!!
 
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Re: Filthy MAP sensor as cause of MCSF?

gald to help
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Re: Filthy MAP sensor as cause of MCSF?

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Originally Posted by rhett71 View Post
Absolutely bob on!! Drives a lot better just takes 2 hours to get to the bloody plug!!!!
Anyways called Donalds at Peterborough and one's on it's way!!! Didn't realise they give you a 10% discount for being a memebr on here!!!
Just to make things clear for the rest...you did clean the MAF sensor!!!

because the thread is about MAP sensor which is something different....
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(Post Link) post #16 of 18 Old 24-12-08 Thread Starter
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Re: Filthy MAP sensor as cause of MCSF?

Yes, kgb, the conversation went in another direction... Any help for cleaning of MAP sensor and inlet manifold?
Cheers. Dusan.
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Re: Filthy MAP sensor as cause of MCSF?

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Originally Posted by dusan View Post
Yes, kgb, the conversation went in another direction... Any help for cleaning of MAP sensor and inlet manifold?
Cheers. Dusan.
a very small squirt of carb cleaner, the inlet manifold has to be removed and soaked for a day or two to reallyclean it, which also means removal of the high pressure pump which runs off the cambelt.

These sensors have microchips in them, the silicon layers will break down over time, more so with the heat in the engine bay, soaking these sensors in petrol is not a good idea, if a small squirt of carb cleaner over the visable part of the sensor makes no diffrence, and the sensor is faulty, then just replace it.
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(Post Link) post #18 of 18 Old 24-12-08 Thread Starter
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Re: Filthy MAP sensor as cause of MCSF?

Thanks for useful information.
Tomorrow I will go into service and suggest cleaning the inlet manifold.
Best regards. Dusan.
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