Q: AFM

[equinox]

I have TWO working Air Flow Meters:

AFM - 0 280 200 018
AFM - 0 280 200 020

I hve 2 questions:

Am I correct in that both can be used on my 1977 WV bus (020 direct replacement for 018)?

Am I also correct in the 020 is an updated version of the 018 and so between the 2, I should primarily use the 020??

Thanks in advance.

Robb

[SGKent]

FI Corp said they use the exact same parts and are the same.
_________________
“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[russwiththebus]

I think they will work. My AFM is a 0 280 200 028 which when I look it up, says it's for a Vanagon but it works fine on my 1978.

[Hoody]

As Steve stated, they are identical.

[furgo]

Just to complement the answer you already got:

[equinox]

Thanks guys, really appreciated!

The only difference I can see is in the flap!

The 018 has the anti-backfire diaphram, which if it does backfires, blows that out.

the 020 does NOT have this. The flap door is a solid piece of metal!

As stated, they both work and I find no noticable performance difference between the two.

However, when reading the pins on the 018, they fall to either side of the mid-range, but one setting is just ABOVE the high side! On the 020, EVERYTHING falls exactly in the middle of the range!

Soo, although both again do work, I think I'll keep the 020 newer improved version in even though not original as the 018 is.

[furgo]

[SGKent]

are you aware that the only place the part number exists is on the black plastic cover? Sounds like to me someone replaced the cap on the one with the backfire prevention. I've had both 018 and 020 - neither had a backfire device in them. Both rely on compression in the well behind the door to protect from that. Does the one with the backfire prevention also have a TS1 in it?
_________________
“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[equinox]

What's a TS1 and I can check?!??

[furgo]

[equinox]

Understood 100%.

Yes, late T2 (Oct 1976) and yes, 7-pin connector.

AFM is rebuilt and replaced the temp sensor to engine also, so new (old one registered like ove 10k ohms and was screwed)!

Funny thing is I ordered a new sensor for like $40 and they are at a premium $50-60?!? but I ALREADY had bought one when the price was like $25 to keep on hand, so I have a spare or to sell!!! lol

I'll have to check if the old 018 had the TS1, but later...now off to see Star Wars!!

[equinox]

Here's a pic of the 018 one. Yes, there is a TS1

https://drive.google.com/open?id=1cIeOrZUxYrymQxpmG1lGnvGgdShENz2x

The new 020 looks like your photo and with the plate over the flap whole but without the screw in the middle. It's hooked up now, so unsure if a TS1 or TS2 is there...probably.

Hope the shares link works.

[furgo]

[equinox]

Thanks for the excellent feedback. A couple other comments...

1. The 018 "is" the original I'm told and had NO work on it prior to:
2. "I" was the one that cause the backfire and blew the flap!
3. The mechanic "fixed" the flap as you pointed out, but was all done during my ownership.

The 020 (later and what I would consider next revision and later model) does has the solid coin type looking thing like you showed. Sorry is I confused you, but not a mechanic, but yeah, you got it, the only only thing to add that supported your comments is the rework and blowing out of the original 018 anti-backfire valve doo-hicky (lol) was all done during my ownership, but previous to the backfire was original.

Yes, I put both the 018 and 020 swapped in nd out and are doing the same thing, so there should be nothing wrong with the 018 either, but as you indicated extra weight and rework I always wondered for the last couple of works if maybe that was an issue, but appearantly not.

[SGKent]

changing the weight of the door will change how it swings. The speed at which the door changes tells the ECU how much extra fuel to add for acceleration.
_________________
“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[equinox]

Yep, understood. It doesn't appear to be a problem thou and since the 020 was made after, but 100% compatible, and readings were even more dead-buts nominal, I would like to use it instead.

Next steps is to go thru the manual and check EVERYTHING betyween New Years and the start of the season ~May (5 months! and see if there is any leaks, ensure hoses are plugged and properly, ensure readings are good throughout, etc.

I should post all of the mechanic(s) paperwork and see if that helps and anyone can flag something. There are a couple things I noted in my mind, but unsure of the scope of their impact. I'll scan everything and post also as time permits!

[furgo]

[equinox]

"how did you manage to blow the flap?"

In short, just over-cranking. Went to go start it one time and it just was not firing and cranking. Kept trying with short stints, then on a long crank....boom! oops. stopped and towed to mechanic who notified me what happened at the time.

[furgo]

[raygreenwood]