Newly rebuilt M20 AFM - $70 (Standard MF20040) NOT a forsale thread

[ForcedFirebird]

FWIW BWD also makes water pumps for the 24v BMW's and watched one spill it's guts in less than 2 weeks of daily driving. Only good thing is I got paid to install it twice, but bad for the customer. I told her not to use inferior parts and it costs her my labor even though it had a lifetime replacement.

[noid]

FWIW BWD also makes water pumps for the 24v BMW's and watched one spill it's guts in less than 2 weeks of daily driving. Only good thing is I got paid to install it twice, but bad for the customer. I told her not to use inferior parts and it costs her my labor even though it had a lifetime replacement.

From what I recall the Distributor rotor for the m20 is a shitty design too. Apparently instead of using allen bolts it uses Philip bolts to mount (stupid with it being such a tight working area), I have also heard of premature failure. I have also heard good things too about different items they sell.

The AFM design is shared with porsche/vw/bmw so the volume they rebuild may make these units good units. I just want one of these units opened up to inspect how they did it. I would just buy one and check but considering I have to make a 1.5 hour drive to buffalo to get one (since double the price here). It would be nice if someone else would check :)

[Gregs///M]

All of the rebuilt AFM's that I've encountered (mostly Fuel Injection Corp,) have had their wiper arm adjusted. The resistor strip was not replaced.

As per the link above, some AFM's have a running voltage of 12V and some have a running voltage of 5V. Using 9V battery could yield inaccurate results. In the e30, most of them have a reference voltage, to the AFM, of 5V DC. Using a 12V reference voltage on a 5V unit could ruin it, so keep that in mind DIY'rs.

[ForcedFirebird]

If you follow the link I posted, you can test your AFM to make sure it is in fact bad.

[ForcedFirebird]

All of the rebuilt AFM's that I've encountered (mostly Fuel Injection Corp,) have had their wiper arm adjusted. The resistor strip was not replaced.

As per the link above, some AFM's have a running voltage of 12V and some have a running voltage of 5V. Using 9V battery could yield inaccurate results. In the e30, most of them have a reference voltage, to the AFM, of 5V DC. Using a 12V reference voltage on a 5V unit could ruin it, so keep that in mind DIY'rs.

They interchange. The Motronic 1.0 uses 5v, 1.3 uses 12v and they are a direct swap for each other (153 ECU is plug and play for a 173).

I have been hacking the OBD1 ECU's for years.

[noid]

All of the rebuilt AFM's that I've encountered (mostly Fuel Injection Corp,) have had their wiper arm adjusted. The resistor strip was not replaced.

Two wrongs don't make a right. Just because they do it improperly doesn't mean that is the way everyone else should be doing it. Generally speaking that is the most profitable way to do it (at the expense of the customer) since it requires no new parts and hardly any labour.

As per the link above, some AFM's have a running voltage of 12V and some have a running voltage of 5V. Using 9V battery could yield inaccurate results. In the e30, most of them have a reference voltage, to the AFM, of 5V DC. Using a 12V reference voltage on a 5V unit could ruin it, so keep that in mind DIY'rs.

There is no need to scare DIY'ers. Its a simple process, that virtually anyone can do. I love that you provide a service to the community and people see value in that. However, there is no reason to scare people into not doing it themselves.

[Gregs///M]

Two wrongs don't make a right. Just because they do it improperly doesn't mean that is the way everyone else should be doing it. Generally speaking that is the most profitable way to do it (at the expense of the customer) since it requires no new parts and hardly any labour.


There is no need to scare DIY'ers. Its a simple process, that virtually anyone can do. I love that you provide a service to the community and people see value in that. However, there is no reason to scare people into not doing it themselves.

Bosch does not supply just the resistor board, you cannot buy parts for these AFM's anymore. You cannot buy it, that's it. If you want "everything new" AFM...buy a new one from Bosch.

Providing valuable information is hardly scaring anyone. I simply stated using 12V on a 5V circuit could damage the electronics, which is true. The article states you must use a "highly regulated 5V power source" so using a 12V or 9V won't work accurately.

If you are going to talk s**t on here, at least provide some valuable, intelligent technical information instead of blasting someone like me, who actually provides technical info instead of asking for someone else to do it. I actually help the community by providing technical information and provide electrical assistance. All you seem to be doing is talking s**t, even downplaying the value of an oscilloscope. Perhaps you should ask your dad if an oscilloscope is a trustworthy tool.

[ForcedFirebird]

Perhaps you should ask your dad if an oscilloscope is a trustworthy tool.

You don't need an o-scope to test a potentiometer.

[Gregs///M]

You don't need an o-scope to test a potentiometer.

Elaborate?

[devon.818]

tldr

standard auto parts is quality, use them daily, sometimes their core charge is more than the price of the part but thats just commical.

[noid]

Bosch does not supply just the resistor board, you cannot buy parts for these AFM's anymore. You cannot buy it, that's it. If you want "everything new" AFM...buy a new one from Bosch.

Providing valuable information is hardly scaring anyone. I simply stated using 12V on a 5V circuit could damage the electronics, which is true. The article states you must use a "highly regulated 5V power source" so using a 12V or 9V won't work accurately.

If you are going to talk s**t on here, at least provide some valuable, intelligent technical information instead of blasting someone like me, who actually provides technical info instead of asking for someone else to do it. I actually help the community by providing technical information and provide electrical assistance. All you seem to be doing is talking s**t, even downplaying the value of an oscilloscope. Perhaps you should ask your dad if an oscilloscope is a trustworthy tool.

Calm yourself pal, no need to get your panties in a bunch. I didn't go out looking for trouble, I started this thread and I am keeping my opinions in this thread. As I said, I appreciate the fact that you provide the community a service, and members see value in that. Not everyone wants to DIY and some people are willing to pay for your service, nothing wrong with that.

If Bosch is still producing and offering brand new AFM units then that means the parts within those units are still in production. PERHAPS (hence this thread) BWD has used their muscle and solidified a deal with Bosch for new boards, perhaps not, perhaps they are using a Chinese POS board, perhaps they bend the arm.

Nowhere did I downplay the value of an oscilloscope. Actually what I said was that oscilloscopes are dime a dozen and is not something special. Any even remotely respectable company will test their units after rebuilding. They can be had for under $100 used on kijiji. I know exactly what an oscilloscope does and I have seen it in action as we had one in my house growing up. For the record oscilloscopes are great devices.

You also admitted that bending the arm higher or lower on a curve results in longer/shorter travel. Your opinion is that it is not a big enough difference to care, my opinion is that it makes a difference. Opinions are great they are like assholes, everyone's got one.

[SmokeE30]

i dont think he is talking shit on your electrical knowledge or doubting the importance of the o-scope, but rather he like most people who have done electrical work themselves see that checking an afm to ensure its working and doing a quick refresh of it are not difficult things to do. i personally feel what you do to referb afm's is not much work at all, but would i buy one from you over a unknown reman place of course, i dont have a o-scope sitting around anymore as it didnt get much use, you a fellow enthusiast that has a reputable background, the proper tools ad experience i fixing these electrical items that make the cars we all love tic. is it something we must all rely on somebody else to do, well no, but would i fell more comfortable buying a unit from somebody like you over the cheapest no name place i can find of course. i think noid just wants to know how the afms i question compare to a good quality unit

[Cha Ching]

"Nowhere did I downplay the value of an oscilloscope. Actually what I said was that oscilloscopes are dime a dozen and is not something special.".....

"For the record oscilloscopes are great devices."

It appears you are contradicting yourself.

[noid]

"Nowhere did I downplay the value of an oscilloscope. Actually what I said was that oscilloscopes are dime a dozen and is not something special.".....

"For the record oscilloscopes are great devices."

It appears you are contradicting yourself.

How so? Can't something be great, readily available and accessible?

[ForcedFirebird]

Elaborate?

You're the electrical engineer that wants to charge kids $120 to bend a wiper track and hook up an AFM to an o-scope, you should already know the answer.

The AFM testing procedure I linked works just fine using a DVM.