92 Supra AFM problems help!

[jsbenami]

Well I don't know what the F!* is wrong here, but maybe somone out there has had issues with AFM's before. Last week while changing out my old gritty HKS airfilter with a new K&N I unplugged my AFM and cleaned the sensor and the housing because they were caked. Well it definitely stopped working and threw up an error code 24 & 31, both AFM codes. It ran just like it was unplugged. I got an ebayed one and though it ran better still no go. So I got a remanufactured one for 350$ and put it in today, the car runs, I cleared the error code, but it can't do anything but idle. No error codes (chk engine) are returning. It will eventually let you rev it up to 2,000 or 3000 RPM's sputtering, but that's about it. It's like it can't get the engine balanced, and there is always a rotten egg smell of unburnt vapor.

One thing I am wondering....is there a difference in the AFM's from say 86.5 - 90 and 90-92? Because I am noticing on both the Ebay AFM and the reman'd one that it has FMZ3AYY1 and though I don't have it anymore the old one I believe said FMZ3AYY2.
Anyone?

[Jeeves]

Nope, same electronics. Cleaning the AFM is a horrible idea, it should never be done (as you've found out).

A reman'd one should be fine, what exactlty are it's symptoms when you rev it with the new AFM? Try pulling the negative cable and leaving it overnight.

[jsbenami]

Well I now know they are most def different from 90-92. Because Toyota deal said so. The new part came in today at Toyota, this one matching to the last number (a 2 instead of a 1 like the ebay one and the one I bought & returned from Advance) at the end of the number on the black sensor. This one I tossed in and the car runs like a dream again.

Let me amend your earlier statement Jeeves: Its not a bad idea to clean your AFM (when it has 1/2 inch of goop) its a bad idea to spray brake cleaner into the screen like an idiot (that's me!) when you don't know what is inside there Prob cleaning it with a rag wouldn't do it in like my shot of solvent did it. Lesson learned (the idiot way) remove sensor before cleaning housing.
Also, for future reference, if you have a 90-92 the older AFMs that end with '1' will not work. The car will idle, and choke everytime you touch the gas pedal. I tried 2 AFMs that were probably originally out of 86.5-89 Supras with the same result. One was ebay used, the other 'remanufactured' the second one had no error codes. Lesson learned (the expensive way) again

[Jeeves]

Originally Posted by jsbenami

Well I now know they are most def different from 90-92. Because Toyota deal said so. The new part came in today at Toyota, this one matching to the last number (a 2 instead of a 1 like the ebay one and the one I bought & returned from Advance) at the end of the number on the black sensor. This one I tossed in and the car runs like a dream again.

Let me amend your earlier statement Jeeves: Its not a bad idea to clean your AFM (when it has 1/2 inch of goop) its a bad idea to spray brake cleaner into the screen like an idiot (that's me!) when you don't know what is inside there Prob cleaning it with a rag wouldn't do it in like my shot of solvent did it. Lesson learned (the idiot way) remove sensor before cleaning housing.
Also, for future reference, if you have a 90-92 the older AFMs that end with '1' will not work. The car will idle, and choke everytime you touch the gas pedal. I tried 2 AFMs that were probably originally out of 86.5-89 Supras with the same result. One was ebay used, the other 'remanufactured' the second one had no error codes. Lesson learned (the expensive way) again

See, that just doesn't make sense w/all the other logic on the forums. The sensor never changed, I've run both the Lexus, a late model sensor and the early one in my car, all ran fine. I'm more inclined to say that the others were bad.

Here's a SupraForums thread proving it: http://www.supraforums.com/forum/sho....php?t=226982&
1989 is when Toyota re-numbered their parts catalog.

The only thing Toyota employees know these days is if it has a different part number, so it must be different. This logic is false as many part numbers changed over the years even as they were the same from year to year. The part # on the Lexus AFM that I ran and the Original one in my car were very different, but the sensor itself and how it operated was the same.

As for cleaning it, you said exactly what I did. You should never everrrr put anything near the electronics (the AFM) in the AFM housing. Dismantling it, and cleaning it thoroughly isn't bad (keeping the electronics seperate), hosing the AFM electronics with anything other than air is. I was talking about the electronics as it's actually what measures the air flow.

[jsbenami]

I agree, you're right I was just making fun of my errant stupidity. I worked on cars for a living for a number of years in the past, I should have known better. But time makes the mind lazy and forgetful. Plus this car is so damn reliable, I hardly every get to go into its sensitive zones. With my old Fords and Fiats....that was like a daily recourse. You could be right about the parts (i can't see your article till i sign up there) and numbers but the end result is the same.....dealer, new almost always works and def fits. Scambay, and who knows.

[Peter]

ya my buddy cleaned his and it fucked it up...