StoogeMoe

I was looking over the procedures to retrack the AFM on Clark's Garage, and the procedure is to bend the wiper arm to change its length and thus the track. I don't like this method for two reasons. One is that in bending the wiper arm, you may now have too little pressure on the conducting strip. This will lead to erratic operation. If you have too much pressure, you may wear away the conducting strip much faster than normal. Reason two is that you have little control where the new track ends up.

So, instead of moving the wiper, why not move the board that has the conducting strip? That is what I did. I removed the connector on the back of the AFM and the three screws that hold the board onto the AFM body. I then took a Dremel and ovaled the holes perpendicular to the wiper arm travel. Then reinstall the board and the connector. The advantage is now you can finely tune where the new track goes by moving the board slightly. Once you have it where you want it, tighten down the screws. Check it, make sure it's absolutely clean in there, and reseal it.

So far everything is working great and my stumble is now gone. It's like having a new car again.
__________________
1986 944 NA Guards Red all original 82K mi.
1984 911 Carrera Coupe (gone, but not forgotten)
"If you're not living on the edge, you're not living."

jmporsche944

Thats a great idea. I just bent my wiper arm to change the track.. and thought it was a somewhat "sketchy" fix to the problem.

M758

I bent mine on my 944-spec car.

That was quite a while ago.

Yabo

If I didn't screw it up, you probably can't.

apierce918

what stumble were you experiencing? i have one at idle after a cold start until i warm up. and since my car is kinda worn (197,000 miles) i'm not sure where to start looking.

SoCal Driver

Try www.frwilk.com

He suggests just loosening the collar and moving it up or down a hair. But bending may also be necessary.

__________________
83 944 = It's NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts
and/or cam chain and tensioner?

The 83

SDGuy

Probably a dumb question - but do you need to remove the AFM, or can you just pull the plastic cover/remove the board while it is still in the car? This sounds like a great solution.

AndyK

You can't get to the innards unless you remove it and turn it upside down! It's REALLY easy to remove (I did it), and way easier to work on on the kitchen table!

testarossa_td

Just do it on the car if you want...no biggy and chances of you screwing it up are slim to none. On the car it might be hard for you to get the black cap off withouth destroying it though. You might want to unplug the connector while you do it for safety.

testarossa_td

S2 is upside down from na and turbo.

StoogeMoe

Like AndyK said, it's so easy to remove, there's not much point in leaving it on the car. I did mine on the kitchen table too. Much better than leaning over the front of the car. It's also easier to cut the sealant around the cover with the AFM out of the car.

____________________________________
1986 944 NA - Guards Red - 82k miles
1984 911 Carrera Coupe - Guards Red (gone, but not forgotten)
"If you're not living on the edge, you're not living"

SDGuy

Great....thanks for the help. My next project. Howard

AndyK

I wonder if it's worth it to re-do mine, using the new and creative board moving technique? I remember bending mine, but it didn't move the needle much. Moving the board 1/8th inch toward fresh surface area would probably provide better results...?

Peckster

Unlikely to be an afm problem, but that is a classic symptom of an early head gasket problem. Run it from cold for 30 seconds, then pull your plugs to see if one looks extra clean.

testarossa_td

All secrets revealed Click picture for original page.