My Stuttering Issue (Another One)

[EZ Gruv]

Base info - Type IV, 2056cc, Fuel Injected

Symptoms - Driving along, after a few minutes, a small stutter, then another, and another. Feel like I'm running out of gas.
Two weeks ago, it was so bad I lost all power and couldn't restart. I got a tow back to town after camping at the lake.

What I've done -
Tested fuel pressure: tests fine right about 35 PSI
Replaced the Temp Sensor II: the new one test at around 2800-ish (or higher) cold, and low 800s warm
Checked for vacuum leaks: none apparent
Checked the AFM connections: all pins and connections good. I did find this piece of plastic (from the lid) on one of the connections inside, which I removed:

It's running fine in my driveway at the moment - but it ran fine in my driveway last week too - after I swapped the TSII, but it still stuttered on me today after 2 miles of driving.
_________________
Eric
1977 Deluxe Westfalia - 2.0L FI Type IV, Completely Original
Photographer for HotVWs, VolksWorld, AirMighty, VW Camper & Commercial, Hayburner, and more.
My Photography Page.

[busdaddy]

Consider a jumper wire between battery + and #15 on the coil for a test, just to rule out a failing ignition switch.
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[aeromech]

Fuel pressure is 35 but how’s the flow? Run a hose into a jar, turn on the key, move the door in the AFM and see if it bogs down
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
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Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[skills@eurocarsplus]

your AFM board is SHOT imho. its worn down to the bone
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[aeromech]

[Jetfxr69]

[VWLover77]

[Jetfxr69]

i dont do subtle well, but i did catch the sarcasm. i guess when i asked, i was expecting someone to respond about what could be used to “repaint” or “recoat” that area.

im sure i have a box or two that is gonna need that as well.
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You can't be a real country unless you have a beer and an airline. It helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer. Zappa

‘77 westy Seamus
‘76 tintop Crusher
‘77 westy The Judge
‘72 tintop bastard westy Hudson

[SGKent]

Richard Atwell was working on a project that would allow replacement boards that actually worked plug and play. Might contact him to see whether it ever happened or not.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[airschooled]

Try this: loosen the four Philips screws and spudge the board in whichever direction it will go, and snug the screws back. This should give the pickup points a new place to ride. This isn't a long-term fix, but it can get you home if the bus refuses to cooperate and you don't want to waste a tow.

Robbie
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Learn how your vintage VW works. And why it doesn't!
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[EZ Gruv]

[EZ Gruv]

Update>
Went on a 90 minute test drive today around Las Vegas, 75 miles, mostly freeway (65-70mph), but also stop and go city driving at various speeds.
The drive began about 1pm, and it was about 44 degrees ambient outside.
No stumbling/sputtering to report.
_________________
Eric
1977 Deluxe Westfalia - 2.0L FI Type IV, Completely Original
Photographer for HotVWs, VolksWorld, AirMighty, VW Camper & Commercial, Hayburner, and more.
My Photography Page.

[aeromech]

Sounds like Robbie saved the day
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[airschooled]

Just borrowing time before the inevitable replacement.
_________________
Learn how your vintage VW works. And why it doesn't!
One-on-one tech help for your Volkswagen:
www.airschooled.com

[EZ Gruv]

[metahacker]

if that picture is accurate and those black paths really are worn that badly above the "OH"MIC (and it's not just the lighting) , then that is 100% for sure the issue

you can further Robbie's workaround scenario by cleaning things a bit with DeOxIt to "help" things a little.. and really trying to keep those contacts off that worn path...

but as said by others, a new one does appear to be in order ..

best paired with a wideband to get the AFM set up properly
you mentioned 2056cc, so i assume 71x96 instead of 71x94, so perhaps a custom motor.. def want to put the time into tuning with the WBO2 if it's not a stock cam

[Gregg in the 603]

That board is definitely rough. I went through this a while ago and discovered the Vanagon guys had found a source for a new board. A few Samba searches turned it up, not sure where it is but may be worth checking.
_________________
1979 Mexico Beige Westy auto
Dirty Dover, NH

[raygreenwood]

[NOVA Bus]

I just replaced my AFM, send to these guys; not cheap but fast $230.

Supposedly they replace the board and internals.

https://fuelinjectioncorp.com/products/air-flow-meters/

The replacement unit tested to spec per my check. Bus runs smoother.

One thing which folks overlook on stock fuel injection is the wires, grounds, and connection points. It will greatly improve your performance if you clean all the connections (ie-Demmel tool wire brush buff/polish), this is a detailed process, and takes a lot of careful work, but it will reward you with a better running engine. Most these vehicles are nearing 50 years, that's a lot of dirt/dust/oil/corrosion to maintain a solid electrical connection.

There are some great electrical contact cleaners as well.
Hosa D5S-6 CAIG DeoxIT 5% Spray Contact Cleaner, 5 oz. https://www.amazon.com/dp/B00006LVEU/ref=cm_sw_r_cp_api_glt_fabc_XJTSE94CRB7TY12G1ZPJ
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1977 Transporter / Weekender
- GE engine, L-Jetronic w/ hyd. lifters
- Brown Beige plaid P27 Interior (ED)
http:/[url=http://www.vw-mplate.com/mplate-29638.png]Click to view image
Camper Interior donor:
[/URL]/www.vw-mplate.com/mcode.php?lang=EN&id=721 (M-Code for interior).

[Wildthings]