Diagnostic Plug
Diagnostic Plug
Im not desperate for one, Just curious, does anyone have the diagnostic plug for one of these? I assume its the same thing across all the VW's of the period?
(started as a wanted ad and got more interesting so mirrored to the workshop)
(started as a wanted ad and got more interesting so mirrored to the workshop)
The sultan of swing
Re: Diagnostic Plug
I've got a couple of looms. I can't remember if they have them but I could have a look.
Re: Diagnostic Plug
If they are looms from the car, that's the socket. The plug is on the computer which got plugged into the car
The sultan of swing
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Diagnostic Plug
Are you planning on making your own diagnostic computer
A couple of guys are using arduino to create GPS based trip computers for the T25's
A couple of guys are using arduino to create GPS based trip computers for the T25's
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
- purplepeter
- Posts: 2339
- Joined: 8th August 2006 - 4:41pm
- Location: Bath, Avon
Re: Diagnostic Plug
I think I've only ever seen 1 for sale, about 10 years ago (around £75)
There's a bit of explanation here http://www.nls.net/mp/volks/htm/plug.htm
But I have it in mind that somewhere I might have a fuller explanation
There's a bit of explanation here http://www.nls.net/mp/volks/htm/plug.htm
But I have it in mind that somewhere I might have a fuller explanation
Re: Diagnostic Plug
I dont really know what im planning, I just wanted one for the novelty. Could have been an easy jumpstart point if ever required.937carrera wrote: ↑12th November 2018 - 10:15amAre you planning on making your own diagnostic computer
A couple of guys are using arduino to create GPS based trip computers for the T25's
Wow, maybe I don't want one then, I was prepared to spend £10-£20 haha. I use that link to rewire mine as I wanted to know what half the pins did and see what I could do with it. Id be interested if you do come up with more info. Have you run out of coffee yet?purplepeter wrote: ↑12th November 2018 - 11:12amI think I've only ever seen 1 for sale, about 10 years ago (around £75)
There's a bit of explanation here http://www.nls.net/mp/volks/htm/plug.htm
But I have it in mind that somewhere I might have a fuller explanation
One that particularly interests me is how they monitored compression, I assume that was something to do with the FI set up
The sultan of swing
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Diagnostic Plug
Yeah, that was quite interesting, though I don't see why it should only be used for FI engines.
Can a man of your abilities do the maths / alogorithm to convert battery voltage, cranking voltage, expected frictional losses, starter motor efficiency and engine rotation speed to a compression value by cylinder in bar ?
I can see the concept, nowhere near having the engineering knowledge to work it out
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Diagnostic Plug
A couple more links for you
https://forums.vwvortex.com/showthread. ... ostic-Tool
https://www.thesamba.com/vw/forum/viewt ... p?t=324880
https://forums.vwvortex.com/showthread. ... ostic-Tool
https://www.thesamba.com/vw/forum/viewt ... p?t=324880
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
Re: Diagnostic Plug
I hadn't even thought that far into it. I just assumed FI engines because they would have some sort of air metering system on the intake, and if compression is good (ie valve and ring seal is good) you would getting more "suck" in the cylinder increasing the air flow in the intake.937carrera wrote: ↑12th November 2018 - 10:08pmYeah, that was quite interesting, though I don't see why it should only be used for FI engines.
Can a man of your abilities do the maths / alogorithm to convert battery voltage, cranking voltage, expected frictional losses, starter motor efficiency and engine rotation speed to a compression value by cylinder in bar ?
I can see the concept, nowhere near having the engineering knowledge to work it out
I assume you are thinking along the line of "energy required to turn the engine over during the starting phase?"
Ta for the links, I shall have a read of those this evening. I seem to have started a decent topic here, just in the wrong section
The sultan of swing
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Diagnostic Plug
Yep, I am thinking about energy required to crank = work required to compress air.
I you were a mod you could just move the topic into another section and then post another wanted ad. O hang on ...
I you were a mod you could just move the topic into another section and then post another wanted ad. O hang on ...
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
Re: Diagnostic Plug
Edit, i now feel very foolish, of course id seen that, it was the link mr purple posted earlier in the thread, its just that i cant remember more than 30 seconds at a time
The sultan of swing
Re: Diagnostic Plug
I took my old Beetle into the dealership for a diagnosis around the time they had the diagnosis system. Obviously they couldn't do the whole job, and reported faults that weren't there (like front toe-in being zero, which was correct for radials). Sadly they did not report the rear linings being down to the mesh backing, which I discovered the next day when both handbrake cables broke due to the quadrant cutting into them. Since rear hub removal was needed, I returned the next day, and left the evidence. They also replaced the weeping wheel cylinders with the wrong (later) ones. After that I started to do my own maintenance!
Dave.