Warm up valve / regulator

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Concker
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Warm up valve / regulator

#1 Beitrag von Concker »

So i found out my "varmup valve / regulator" delivers 3bars of wrong pressure (same pressure both with and without vacume aswell)

I see in etka that the oem part has the number 035133403 and 035133403D

Can i use 035133403E? This seems to be alot easier and cheaper to obtain.

Or will it work with an unit from a golf or something also?

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5E-Thomas
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Re: Warm up valve / regulator

#2 Beitrag von 5E-Thomas »

Perhaps you try to restore your original part instead of installing another used one. Just read this manual.
Viele Grüße
Thomas

Concker
Lehrling
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Re: Warm up valve / regulator

#3 Beitrag von Concker »

5E-Thomas hat geschrieben:Perhaps you try to restore your original part instead of installing another used one. Just read this manual.
Thanks for the nice guide.
I will look into it. I guess it depends of there are any repair sets or spare parts if the heating elements etc is broken.

Concker
Lehrling
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Re: Warm up valve / regulator

#4 Beitrag von Concker »

Okey.

So i took the "wuf" apart, and cleaned all the parts, making sure nothing was damaged.
It all looks clean and in working order, the bimetal also has the right ohm value.
So i put it carefully back together, also tested by manually pushing the pin while blowing some compressed air into the inlet.
When i lightly press the pin the flow trough the outlet stops, so that seems to be working?

However when i put on the lid and place it back into the car, its the same story with it getting to little fuel.
The workshop has tested that system flows are ok, but the outlet flow from the wuf if 3bar wrong, resulting in it running lean.

So i took a look at the parts number, in my car i guess the previous owner has tried to change it before.
As the part in my car har the number: 035133403g
Wich is an C3 / Golf 2 wuf.

Could it be that simple that i need to get the correct wuf?
According to the parts catalog the correct one would be 035133403 without any letters, also there is an variant in the catalog that ends with D (035133403D)
Where the "D Version" seems to have 3 vacuum inlets/outlets, there the letterless, E and G only have 2, where 1 is plugged of. (Seems not to be doing much on mine)

Im not sure what to buy/do next to be honest.

Old Rusty
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Re: Warm up valve / regulator

#5 Beitrag von Old Rusty »

Hi,

there is some data to be found in "Bosch Automotive Tradition" files.

035 133 403 G equals 0 438 140 120 and was to be used for Audi 5000/4000 from 07.1982. It generates a governor pressure of 3.6 bar. Bosch says it is "similar" to 0 438 140 035 which indeed equals 035 133 403 without index letter, produced from 07.1976.

So far no problem I would say using either of these. You know very well that main pressure of K-Jetronic is 6 to 6.5 bar depending on version and the governor pressure regulated by temperature, ambient air pressure and vacuum pressure resp. turbo boost pressure is about 2.5 to 3.5 bar? There is a diagram describing the relation in the workshop manual.

Considering 035 133 403 D Bosch tells us it equals 0 438 140 094 and this one was designed for Audi 5000 in 04.1980 with full throttle enrichment ("wot"). I would not recommend this one unless you have the complete Audi 5000 emission setup.

Regards, Joe
:?: Wenn Du es selbst instandgesetzt hast, weisst Du auch, wie lange es halten wird und warum es wieder kaputt gehen könnte :D

Audi 100 S 1970 ZX
Audi 100 GL 1972 ZJ
Audi 100 GL 1973 2T ZP
Audi 100 LS f.i. 1975 YB
Audi 200 5T 1981 WJ
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Concker
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Re: Warm up valve / regulator

#6 Beitrag von Concker »

Old Rusty hat geschrieben:Hi,

there is some data to be found in "Bosch Automotive Tradition" files.

035 133 403 G equals 0 438 140 120 and was to be used for Audi 5000/4000 from 07.1982. It generates a governor pressure of 3.6 bar. Bosch says it is "similar" to 0 438 140 035 which indeed equals 035 133 403 without index letter, produced from 07.1976.

So far no problem I would say using either of these. You know very well that main pressure of K-Jetronic is 6 to 6.5 bar depending on version and the governor pressure regulated by temperature, ambient air pressure and vacuum pressure resp. turbo boost pressure is about 2.5 to 3.5 bar? There is a diagram describing the relation in the workshop manual.

Considering 035 133 403 D Bosch tells us it equals 0 438 140 094 and this one was designed for Audi 5000 in 04.1980 with full throttle enrichment ("wot"). I would not recommend this one unless you have the complete Audi 5000 emission setup.

Regards, Joe
Thanks, i found some documents on bosch classic, but nowhere does it says anything about pressure.
I guess i just want to know if my WUR is defective, or if it is just a case of wrong part in my car.

So according to bosch i should use:

0 438 140 034
0 438 140 035

But according to your information the G version that i have in my car:

0 438 140 020
0 438 140 021

Should also work, so when the workshop say that all my pressures is okey, except the WUR is outputting 3bar wrong it means that the WUR is defective and i should find a replacement? (As i have cleaned it up, checking everything inside)
Does that then mean i can use the "E" version? 0 438 140 113/114 since this is alot easier to obtain.. or any other of the 2.2 engine wur's?
I dont have any workshop manuals, is this something that i may be able to get my hands on?

Also thanks alot for the help so far.
I just really need the engine to go as it should without leaning out then i can start the restoration on the rest of the car. (Once i save up enough money for paint etc)
From what the bosch workshop found out everything else, vacume, system pressure etc should be all fine. Just the WUR making problems.

Again thanks alot :)

jf44
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Re: Warm up valve / regulator

#7 Beitrag von jf44 »

Please check the "warmupregulatorrepair.php" on "ferrari400parts.com"
There is a good description of disassembling and repairing the Bosch WUR with pictures.
Even the adjustment of the control pressure is mentioned!

Good luck
Josef

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Re: Warm up valve / regulator

#8 Beitrag von Concker »

Alright, so after multiple tries to redo the wur i could not find any obivius fault with it.. However the engine kept running lean.. So i bought an new redone unit from Germany with the correct 034 part number.

So i installed it and did some fine tuning to the ignition point and woho! Alot more power and it runs nice and clean. :D

However i still have cold start issues so i will need to look deeper into the cold start valve i guess, atleast check that it actually gets 12v power when cracking the engine, i guess there would be a sensor somewhere that controls this? Could not find any temp sensor when i was installing my custom water temp gauge and sensor.

Also does the thermo vacume valve have anything to do with the issue?

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Audi4ever
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Re: Warm up valve / regulator

#9 Beitrag von Audi4ever »

Hi,
the cold start valve will isn't controlled of an sensorik. It's a bi-metal part. This part is ruleing the time for cold start valve injection in dependent on temperature of engine block and outdoor temperatur.
And this part will be working as a outdoor temperature less 10 degrees.
You can check the function, when you install a test lamp on the plug for cold start valve.
In this way have to shine, when rules the cold start valve.
Viele Grüße Carsten
Audi 100 GL 5E inarisilber EZ 02.1979

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Old Rusty
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Re: Warm up valve / regulator

#10 Beitrag von Old Rusty »

Hi,

instead of trying this'n that I would like to suggest you to buy the Bentley's workshop manual for the Audi 5000 or maybe any repair book on Golf GTI Mk1 or speaking technically the best lecture is Bosch: Kraftfahrtechnisches Handbuch. One hour of reading can save you hours of changing parts and experimenting if you reach basic understanding of K-Jetronic functions.
Jetronics is no hi-tec but twenty years ago I was on the same level of knowledge as you seem to be now and I have spoiled lots of work hours and money these days.

Regards, Joerg
:?: Wenn Du es selbst instandgesetzt hast, weisst Du auch, wie lange es halten wird und warum es wieder kaputt gehen könnte :D

Audi 100 S 1970 ZX
Audi 100 GL 1972 ZJ
Audi 100 GL 1973 2T ZP
Audi 100 LS f.i. 1975 YB
Audi 200 5T 1981 WJ
VW T3 1990 NF

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