Best source for "new" AFM

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SimonB
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Best source for "new" AFM

Post by SimonB »

Hello,

The mechanic I use says the AFM on my stock(ish) 2.5 GTV6 is running out of adjustment and is now just about 1.5% CO with the air screw all the way out.

It is time to start looking for another one. I seem to remember that the AFMs from other L Jet cars will fit.

Which ones are best and is there any advantage in getting a bigger one on a car like mine, (standard cams and just a skimmed head, CSC manifold and exhaust and a K&N element)?

Thank you

Simon
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'84 GTV6 UK spec back on the road after 4 years!
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squadragrunn
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Re: Best source for "new" AFM

Post by squadragrunn »

bmw 3,5l (635) ones should do the trick
-charles-
gtv6 3.0 24v, 164qv 24v, maserati biturbo 2.8 evo, mb 500se, zzr1100d

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SimonB
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Re: Best source for "new" AFM

Post by SimonB »

Thank you,
Anyone know the part number for one of those?
¡Si me gusta conducir, es porque conduzco un Alfa!

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kevin
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Re: Best source for "new" AFM

Post by kevin »

If you use the BMW afm you also have to modify the airbox as the air flap is larger . With your mods I would not change to another type but source a better condition one instead . Check with Alex as he has huge amount of spares .

enzo
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Re: Best source for "new" AFM

Post by enzo »

here is a new one

http://www.ebay.de/itm/Luftmengenmesser ... 20eb64df8e

or just search by the bosch number 0280202013

Jim K
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Re: Best source for "new" AFM

Post by Jim K »

Easiest correction to do is to set the CO adjustment screw mid-trave, then tighten the clockspring 1-2 teeth and re-measure %CO. What you see is a normal weakening of the clockspring over time. If your existing afm size was adequate for ~235hp in the old GpA cars it should be enough for any road-going 2.5V6.
Jim K.

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SimonB
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Re: Best source for "new" AFM

Post by SimonB »

Thank you Jim! Yes I didn't think I needed to go up a size, just source a working one. Thank you for the tip. Simon
¡Si me gusta conducir, es porque conduzco un Alfa!

'84 GTV6 UK spec back on the road after 4 years!
05 Corolla daily driver

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Re: Best source for "new" AFM

Post by SimonB »

Latest update on this is that the mechanic had already tightened the spring, he says the problem is a worn potentiometer track. I guess I do need a new one :(
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Jim K
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Re: Best source for "new" AFM

Post by Jim K »

There's a cheap-ass fix for this one. If you loosen the 3 screws holding the pcb plate, you can move it by just a few tenths of a millimeter, so that a new section of the potentiometer track is exposed. If this is not enough and you want to do an even better job, you can remove the plate, file the fixing holes so that the plate can sit in a new position, exposing a 'new' potentiometer track. On reassembly, be careful not to reposition the wiper too low on the shaft; you want to have the least possible pressure on the track from the spring contact so they both last as long as possible.
Jim K.

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