KV engine-what does this sensor control??
 

It's the sensor on the bottom of the pipe(Not top.),that goes from head to radiator?
What is this (temp) sensor(brown/black wire.) for and what does it control.
Thanks.:tup:
http://i702.photobucket.com/albums/w...001TOPRINT.jpg

is it the fan switch? Either that or maybe water temp gauge?

Water temperature sensor. Gives signal to ECU or temp gauge - can't remember.

i think it's a gear stick for small upside down monkeys..? :ihih::nod:

Pull the wire off and see which one stops working.

If it's for ECU - will not see it. It let's ECU to know - when to open cold start injector and extra air "valve" at the end of inlet manifold - holding on rubber pipes....

If it's for gauge - yes, You'll see it immidiately!

So logicaly - You'll understand for what it is ;)

Only part connected to KV engine that could be called "ECU" is that small control unit, which controls ISV. Probably that sender is for it. For temp gauge and light should be the one which is on top - looks very familiar, the same as on B3 I4 engines.

Thats the temp gauge sender . Line 30&155 of the drawings with a Blk/Brown wire.:tup: I was wrong see later comment....:rolleyes:

I was thinking,exactly the same.:lol:

Thanks,for all you replies.:tup:
Next day off,I'll have a play around and let you know what I find?:nod:

You are right! Somehow through years all units what controls something on engine - everybody calls "ecu"... :D

The arrangement on the KU engine looks exactly the same - wire is the same colour.

Having had a quick look in my Haynes and Bentley manuals, I'm none the wiser.

Injection and ignition systems use the MFTS (above it).
Temp gauge sender is on rear of cylinder head.
Thermotime switch for CSV is in radiator.

This single connection doesn't seem to get a mention.
It could be for the ICU (as previously stated, there is no ECU)

It's got me,scratching my head.:confused:
I'll have to,do some research.
I was wondering,if it could have anything to do with my high idle?(Shooting,in the dark.)

Temp gauage as per 20vcqdrivers post. :)

The clue being its earthed thru the block.:tup:

Its something to do with the ISV valve,
If I unplug it with the engine running the idle drops, but if i plug it back in nothing happens untill the ignition is turned off then on again.

Top sender is for the temp gauge.

What does it control?
 

Went out and checked mine.
Take lead off and engine doesn't start.
Pushed it back on and engine wouldn,t idle.
Played around alittle more and idle high.(1100.)
:wall::(

OK. Looked again with my glasses on :rolleyes:and it's actually sensor N10. connected to the idle stabilisation unit J142 pin 13/T. used to determine isv operation during cold starting/warm up phase.
Hope this helps:tup:

Thanks alot,for that.:tup:
So,I might be barking up the right tree?Check some more and check sensor.(Might have to renew?)

Clearing that corrosion off would certainly help :tup:

That would be my first step,get rid of green fur.:nod:
Looks like the senor,is slightly leaking?
This Sunday,I'll have a good look and get to the bottom of it.

As I said - for air-inlet valve in rubber pipes at the end of inlet manifold - or idle (it's more correct) ;)

:tup:

Eureca.
 

Went to GSF today and purchased part No 929VG0090.(TEMP SENSOR-1 PIN BLACK.)It cost me,£5.10.:yikes:
Took off the old one and fitted the new one.
If you replace it when your engine's hot,be careful.The water that comes out,is very hot.Don't forget to top back up with water afterwards.:idea:
The whole job,should have taken me about 5-10 minutes.It took me about half an hour,because the female connector snapped off:wall:.Had to walk about half a mile,to a motor factors.:(
New sensor and new connector fitted.:tup:
Turned key and started 1st turn of engine.:nod:Idle,settled back to about 850rpm.:tup:

The problem I was having was when it did idle(intermittent.),it idled at 1100rpm.I thought it was my ISV,so changed it 2 times.No change.:wall:
Touch wood.The new sensor,has cured the problem and she seems more responsive.:ihih:
Only time will tell,but I hope it,s cured my lower than usual mpg??
It,s weird to drive and not worry about the car stalling.:smilewinkgrin:My starter,should last longer now.:nod:
So if anyone is having the same symptoms,try this sensor first.If it's not that,you've only lost £5.10.(But could have saved,£150 on a new ISV?)

I love it,when a job comes good.

:)great news, job well done :tup:

I believe I've never changed a single sensor on a KV engine and they have always been running right. But if it can be even better for a fiver then why not :)

Might not work for everyone?
 

It was,25 years old.:)
The engine now,is alot more responsive(not drowning.) and acouple of my problems cured.
My engine starts,1st time now.I thought it may have been my fuel accumulator?I still have to check it(and other things)just in case.:nod:
For just over £5,everyone should give it a whirl.You maybe surprised??:tup:

When the CQ is up and running again I'll be replacing this one for sure. Any more I should think of?

Best test sensor first.
 

Might not work for everyone,But for that price I thought I,d give it ago.
Worked,for me.:tup:
Still looking into,what all the sensors do.:nod:
Next step,is fuel pressure testing.(When,I get time?)

just done a search on temp sender and found this thread. I am having problems with the engine idling. it seems to be drowning and it really smells of petrol. I've traced it to the same ECU sender discussed here.. However my temp sender has two spade connections but only one cable! Is it the wrong sender and should be replaced with a single connection one? Engine is a KV engine. The engine starts easily and revs freely after you come over the initial idle speed. What about the cold start valve can this be stuck open so the "choke" is on all the time (easy starting/ but bad running). Thanks for any help and merry christmas. P.S. I've cleaned the ISV and checked it is working.

biggyin, does this look like the temp sensor to you? it's fitted to the rear of the 7A engine block
in my car next to the bulkhead>>

http://www.ebay.co.uk/itm/Audi-90-10...5110ad4&_uhb=1

http://i18.photobucket.com/albums/b1.../Photo0929.jpg

http://i18.photobucket.com/albums/b1.../Photo0928.jpg

http://i18.photobucket.com/albums/b1.../Photo0926.jpg

thanks,
craig

ps i know that there's a dodgy core plug in there - that's the NEXT on the list of never ending jobs to do to mr hunt!! :rolleyes:

I'm not a biggyin, however that thing looks like temp sender to me as well :lol:

thanks, cap'n!!

:D

On the 20v, that's G62 ecu temperature sender

i have ordered a new one - just one more part in the the journey to return this wonderful old bus to it's fully operational state..

:nod:

It's a cheap part,you can't go wrong.:tup: