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zh007
Samba Member
Joined: February 24, 2015
Posts: 32
Location: Florida
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 Posted: Sun Apr 24, 2016 11:33 am Post subject: Re: Low-RPM stumble |
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| SGKent wrote: |
| fyi - sometimes the intake runners get caught on the tin when they are bolted down. Also be sure that the rubber injector seals are good. |
The runners look ok - snugged the bolts a bit. I also just replaced the 2 rubber seals on each of the injectors.
Is the MAF supposed to leak from the bottom?
Link
I only get smoke from this area and the horn attached to the air filter housing. (with or without the throttle held open)
* Edit: I believe this is perfectly fine and normal. I've read elsewhere on the forum the MAF is not an air-tight box.
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'77 Westy (Marigold)
'91 Vanagon Carat (Mako)
Last edited by zh007 on Tue Apr 26, 2016 5:27 am; edited 2 times in total |
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zh007
Samba Member
Joined: February 24, 2015
Posts: 32
Location: Florida
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| Posted: Tue Apr 26, 2016 5:25 am Post subject: Re: Low-RPM stumble |
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I'm going to call this one solved.
My advice for anyone searching the archives in the future?
ITTSS!
(It's the Temp Sensor II Stupid!)
I checked the TSII several times with a VOM. Each time, I found around 2500 ohms cold and anywhere between 80 and 125 ohms hot. I checked resistance against the block and against the TSII itself. What I did not do, and I should have, is put a socket on the TSII and make sure it's tight.
I picked up a new TSII and was going to swap it out just for good measure. Before backing the old one out, I decided to see if it was tight. It wasn't. I was able to tighten it several more turns. I stuck a new blade connector on the end (I snipped the existing one off so I could remove the tubing so as to be able to stuff the wiring up into a deep socket). She drove fine last night and during my commute this morning. This is the first time in weeks that I've had a trouble-free drive to work.
I'm glad I spent some time troubleshooting this though. I did have several vacuum leaks, my dwell was way off, and I finally learned how to adjust my (hydro) valves. All in all, a good experience. And now I have a brand new TSII for my toolbox. I'm sure I'll need it eventually.
Thank you for everyone that helped!
Zach
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'77 Westy (Marigold)
'91 Vanagon Carat (Mako) |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 52763
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| Posted: Tue Apr 26, 2016 6:24 am Post subject: Re: Low-RPM stumble |
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| zh007 wrote: |
I'm going to call this one solved.
My advice for anyone searching the archives in the future?
ITTSS!
(It's the Temp Sensor II Stupid!)
I checked the TSII several times with a VOM. Each time, I found around 2500 ohms cold and anywhere between 80 and 125 ohms hot. I checked resistance against the block and against the TSII itself. What I did not do, and I should have, is put a socket on the TSII and make sure it's tight.
I picked up a new TSII and was going to swap it out just for good measure. Before backing the old one out, I decided to see if it was tight. It wasn't. I was able to tighten it several more turns. I stuck a new blade connector on the end (I snipped the existing one off so I could remove the tubing so as to be able to stuff the wiring up into a deep socket). She drove fine last night and during my commute this morning. This is the first time in weeks that I've had a trouble-free drive to work.
I'm glad I spent some time troubleshooting this though. I did have several vacuum leaks, my dwell was way off, and I finally learned how to adjust my (hydro) valves. All in all, a good experience. And now I have a brand new TSII for my toolbox. I'm sure I'll need it eventually.
Thank you for everyone that helped!
Zach |
Put some never seize on the threads to keep them from corroding. |
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Randy in Maine
Samba Member
Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Tue Apr 26, 2016 7:41 am Post subject: Re: Low-RPM stumble [Solved] |
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| Got to love the cheap fix. |
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SlowLane
Samba Member
Joined: July 11, 2005
Posts: 1044
Location: Livermore, CA
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| Posted: Tue Apr 26, 2016 8:11 am Post subject: Re: Low-RPM stumble |
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| asiab3 wrote: |
Looks like the TDC sensor wire for the deanship computer diagnostic plug that went obsolete about as fast as it was introduced. It's only participating when you hook up one of the old room-sized computers to your engine compartment plug, which is probably gone or disconnected. |
Not quite room-sized, Robbie.
The TDC sensor plugs into the Grundig VAG 1367, which is a suitcase-sized gizmo that can be used to dial in your timing with enviable precision. Ratwell has a write-up on one here: http://www.ratwell.com/technical/TDCMarker.html#1367
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Present:
'81 Westfalia: 2L, manual. Originally Canadian, now Californiated
Back in the day:
'72 Super Beetle
'69 Camper Van - Corvair powered
'71 Window Van - Transferred Corvair from '69
"With sufficient thrust, pigs fly just fine." - Internet RFC 1925
"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance." - Sir Terry Pratchett |
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zh007
Samba Member
Joined: February 24, 2015
Posts: 32
Location: Florida
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| Posted: Tue Apr 26, 2016 1:28 pm Post subject: Re: Low-RPM stumble [Solved] |
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Is there no way to tune the VW FI system with a PC? I'm assuming not, since I've not read of anyone doing so.
My '83 Jeep CJ7 has an aftermarket TBI system based off of GM ALDL/ODB I, and there are dozens of pieces of software that I can use to data log, tune fuel trims, etc.
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'77 Westy (Marigold)
'91 Vanagon Carat (Mako) |
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 42989
Location: at the beach in Northern Wokistan
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| Posted: Tue Apr 26, 2016 1:37 pm Post subject: Re: Low-RPM stumble [Solved] |
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you can get a wide band oxygen sensor like Innovate makes (they make different models) that has options for inductive tachometer and a MAP sensor etc. Then run your bus and download the results into your computer. You can't make changes from your computer but you can read the graphs. If you want another gauge they make models that go in a gauge cluster.
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 Canned Water - the new California approved parts cleaner (except in a drought in which case rub it with sand).
George Carlin:
"Most people don't know what they're doing, and a lot of them are really good at it."
Skills@EuroCarsPlus:
"never time to do it right but always time to do it twice"
1971 deluxe (sold)
1977 deluxe |
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