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(Post Link) post #1 of 4 Old 19-04-10 Thread Starter
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Possible maf failure?

Evening all.

I have been having a few problems with my 147 such as backfiring exhaust and lack of power i was told it could be the timing. My plan was to have the cambelt changed and timing dine and see if that helped. Upon some googling i noticed some people say unplug the maf and see if that helps, if so it could be maf failure.

I just unplugged my maf sensor and took the car for a drive and it pulled really well, felt noticably quicker and pulled much better through the revs.

After half a mile i got a selespeed failure notice but no light on the dash. The car still drove fine and didnt make a difference, Then when stopping to reverse into my parking spot the car stalled and wouldnt start back up. I pushed it back into the space and plugged the maf back in and sure enough the car fired up but still displayed selespeed failure and mcsf. Turned the car on and off a few times and cleared both warnings but the car is slow again

Does this mean i need a replacement maf sensor? eurocarparts have them for just over £100 for a genuine bosch one, is this the going rate?
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Sounds like the symptoms mine had when the maf was duff (mine's a manual one though).

Price is about right...shop around, but avoid cheap non-Bosch ones.

Selespeed issues might be unrelated. Best to get the fault codes read (by someone who knows the difference between an engine ecu and a selespeed ecu ) to see what it's mumping about...
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give it a clean...has worked for me in the past...

Remove the MAF - undo the metal clips with a pair of small pliers or lever off with small screwdriver, undo the cable tie which keeps the connector cable tidy to the air duct.and then the connector remove the MAF.

There are 2 TX secrurits screws that clamps the sensor to the MAF body...these can be undone with pliers as they are not to tight.

Pull the sensor head out and stick the MAF body a bowl of luke warm water and slosh about...use a sponge to clean the inside of the MAF body but do not touch the Mesh. then put back in the bowl and leave for about 20 Mins...

To clean the sensor head you need anti-static cleaner from Maplin or any radio hobby store..

Spray liberally all over the head......

You will see a channel in the sensor head, and will notice a wire running inside....you can clean this with a cotton swab with cleaner applied.....don't go to mad just apply gentle pressure.

At the side of the sensor is a metal plate within another channel...you can clean this using the cleaner and some tissue, wedge it in the grove and slide in and out....you can use a small screwdriver to exert more pressure to clean the plate and the edges.

The sensor heads..electonics is sealed so don’t worry too much...but still be careful.

When this is done....rinse the sensor head under luke warm running water from the tap and just cover the top part of the head where you have cleaned...

when done remove the MAF body that was soaking, test the mesh for cleanness with a cotton swab, if still dirty use the anti-static cleaner to clean more..and re wash in luke warm water.

Lay both the sensor and the MAF body...on a tea towel on a radiator to dry ...

Re-Fit the MAF all back together and put back on the car.
(Post Link) post #4 of 4 Old 20-04-10 Thread Starter
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I just ordered a maf sensor from autolusso for £40 inc delivery. I will keep the spare to clean should i ever have problems in the future.
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