AFM replacement. Genuine or pattern? - Alfa Romeo Forum
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(Post Link) post #1 of 3 Old 11-01-14 Thread Starter
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AFM replacement. Genuine or pattern?

I am experiencing poor performance when accelerating. Diagnostics does not report any errors. The car runs much better when I disconnect the AFM, which points to it being duff. I shall give it a clean before investing in a new one as they are not cheap. I am not sure whether to replace it with a genuine, pattern, or used.
The previous owner had the AFM replaced in Nov 2009 with a genuine Bosch one fitted by the Alfa Aid specialist whose words to me now are:
It could be another AFM as they are rubbish
Because the last AFM has lasted only three years, I am uncertain whether to buy another genuine Bosch replacement or chance getting a pattern from eBay.
For the price of one genuine I could buy approximately five pattern. They are guaranteed for 1 year which could give me five years worth of motoring. but I'm wary as some threads in the AO forum give negative feedback.
Advice from AO members please! If the consensus is for genuine, where at the moment is the best deal?

Does anyone have a good used one? Part No. 46444287 for 1999 GTV 3.0 6V 24V
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Give it a good spray with contact cleaner and make sure that the air filter is of the correct type and is fitting correctly. Check that there isn't a hole in the bottom of the filter box and whilst you are at it give the box a good wipe and a vac out. I'd be surprised if you actually need a new one yet but I would get a genuine bosch item if it does come to that. Do some searching and you will find reference to a Vauxhall part number that is the same part but cheaper IIRC.
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(Post Link) post #3 of 3 Old 18-01-14 Thread Starter
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Hi Martyn

Thanks for the advice. The previous owner fitted the wrong air filter and only fitted two of three nuts retaining the air filter box lid.

Correct Part No: 60623350 282mm long
Incorrect Part No: 60603977 258mm long for 2.0 engines

It must have been flapping around in the air filter box like the proverbial "P**** in a shirt sleeve". The box was full of leaves and the MAF grill clogged.

I sealed the hole in the middle at the bottom of the air filter box by sandwiching it between a 6mm bolt head & washer and washer & nut. This hole looks like it was produced in production and there must be a reason for it ... can anyone enlighten However, without sealing it would have allowed unfiltered air to mix with filtered air passing up through the middle of the air filter. The small hole 3 mm approx at the outer edge is a water drain hole. Any air coming in through this hole would have to pass through the air filter.

I gave the MAF a good clean with contact cleaner and cleared the clogged grill, carefully.

Now the good bit. I took it for a test drive Like the proverbial "S*** of a shovel". I redlined it without a hint of hesitation. I now know what all the fuss is about with this engine. What a beast!

One happy bunny
Attached Images
File Type: jpg MAF.jpg (99.7 KB, 13 views)
File Type: jpg MAF Close up.jpg (72.5 KB, 14 views)

Last edited by P3rksy; 18-03-14 at 08:34.
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afm , genuine , pattern , replacement

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