AFM reostat board recoating

[micbrody]

As for replacing AFM with heated wire mass sensor , i briefly thought about it and did a tiny amount of research. The first link shows cars from 1985 to newer. Not sure about second one,
I think the big question is converting the new sensor voltage to the proper voltages used by ECU. In addition, the linearity of voltage change might be different than mechanical air flow vane. This could all be calibrated IF the ECU can be reprogrammed . But I have not seen ECU from this age that are reprogrammable. Maybe they are; or maybe they are “solid state” and not reprogrammable. Bottom line, I went with easier route.
And for the increase in HP : I’m a little sceptical as to that concept. I would think that ultimately the engine displacement and timing adjustments would define the HP; not how the airflow is measured; but I could be wrong

[QuebecFiatSpider]

Thanks for your comment

By the way the second link I posted is the device that would be used to convert the signal from a new MAF to an older volt signal from AFM...But it needs to be programmed correctly in order to work perfectly.

I'm not saying I'll go that route...but If I would have an extra 1,000 USD that I don't know what to do with it, I would probably consider trying to develop something myself...a lot of studying is needed though

[micbrody]

Update -
I started to have some “performance issues” over last 100 miles. Car started fine; but noticed when accelerating , it just “seemed” to be slightly less torquey. It wasn’t always reproducible. I attributed it to maybe cold start of car; or extra humid conditions; maybe distributor cap issue, OR AFM recoating performance starting to fail..... (I always seem to come up with reasonable rationalizations to minor issues that eases my mind when driving this car - and rationalization is useful to keep driving it until real problem occurs!).
Well real problem finally occurred. Car started fine. Drove a few miles to post office. It seemed fine; again maybe less torquey. After leaving post office, performance was HORRIBLE- like I barely could accelerate (0-40mph in 20 seconds ); I was prepared for car to completely fail. My first inclination was catastrophic AFM failure ; however a few things didn’t make sense: idle was rock steady; and performance sucked at any rpm (if AFM issue, there still should have been “sweet spots” on resistive board.
After about 2 miles, all problems suddenly went away (still slightly less torquey) , but fairly good acceleration.
At home: I quickly tested AFM with voltmeter and voltage load: worked totally perfect!
Thus I concluded: fuel delivery issue.
I went to trunk. I had installed a see-through glass walled 100 micron pre-filter just after fuel line pickup from tank (but before fuel pump; still original fuel tank).
There were many yellow flakes of hard stuff in filter; but did not look like filter overwhelmed. I removed filter and disassembled.
Eureka! Even though filter media not overwhelmed, the narrow lumen of barb the inflow of fuel line is attached was clogged with these flecks.
I cleaned out. Re-installed. Runs great! No torque issues!
So: AFM experiment still going perfectly

[micbrody]

Drove over a year; probably 1500-2000 miles, car driving fantastic. I really think this is the solution!
I have not had to repaint board.
I have two more AFMs that I am going to donsame thing.

[ScotFiat]

@micbrody this fix worked wonderfully! Thanks for the tips and continued report-out.

I used the same product, but created vinyl masking template using a digital vinyl cutter to get nice crisp edges on the repaint. Might have been overkill, but the finished product looked like-new.

Vehicle now runs much smoother than before…road test to follow soon!

Thanks again!
ScotFiat

[micbrody]

Good to hear that someone tried my “fix”. Still working great after another 2000 miles