can't find what 's wrong, help needed

[vertigone]

Hi,
i have tried 3 isv with same symptom
But yes original one was cleaned with White spirit
For boost leak i Only did with 0.5 bar because don't have a good compressor
Perhaps not enough to detect leaks ?
The Way i do it is Trough Maf intake hose

Thx for all your help guys :-)

[vertigone]

Ok i've change ISV, MAF, n75, Main Coil (3B)
did the same ...
the only thing i've not tried yet is changed the TPS as it seems to show up good value but perhaps it can have bad connexion inside after motor get hot ?
Very hard diagnosis, i'll try spare one

By the way, where does the "tick sound" comes ? very soon or you have to move about 1cm the throttle to "tick" ?
If I understand there is 2 sensors in the TPS and the IDLE one can failed without having trouble when getting full load ?

[Bowlerwell]

Have you tried changing the Lambda?

[UrS4boy]

Ok i've change ISV, MAF, n75, Main Coil (3B) did the same ...the only thing i've not tried yet is changed the TPS as it seems to show up good value but perhaps it can have bad connexion inside after motor get hot ?
Very hard diagnosis, i'll try spare one. By the way, where does the "tick sound" comes ? very soon or you have to move about 1cm the throttle to "tick" ?
If I understand there is 2 sensors in the TPS and the IDLE one can failed without having trouble when getting full load ?

You are throwing too many parts at this problem, many of which have nothing to do with your problem, e.g. N75, *and* your pressure test was not high enough. You need closer to 1 Bar for a good test.

There is good throttle position G69 and idle switch F60 info (including pin-outs and tests) in the hot link diagram that I pointed to you previously (bottom middle):

http://members.shaw.ca/speedtek/UrS%20Engine%20Bay%20Device%20Map.html

[vertigone]

I already done all the tests and value looks as they should be for TPS
But tonight a friend will come and we will try other spare TPS to be sure and compare value
I'll keep you updated what we find thx !

[vertigone]

hello,
Friday night we change the TPS and the white t° water captor back of the motor
It did the same again

I decide to remove my intake manifold to get a better view of the engine and all cables running under ...
I've made my OEM TPS check with Ohmeter :
Between pins 2&3 @ idle : 0,98 kOhms
Between pins 2&3 @ wot : 2,96 kOhms

sounds good in what i've read from technical book

What is this please ? When I pressed very gently the throttle there is a kind of first move before it open the manifold and "tick"

we can see the little gab on pics below :

close :


open before "TPS tick":


Is this normal operation ?

[vertigone]

Other imput We 've found friday :
After a better boost leak test with good compressoir we have detected a quite big leak from injectors hole rings (those which are screwed in the intake manifold) ...
This could give me idle problem ?
I've remove them but they broke inside (hopefully I had remove intake manifold from car before), do they exist in better quality then plastic things ?

[220bhp]

I had this problem,Newsh helped me to sort it out with the help of white cottage Quattros.
We had to take the I m of the car because there is no way to get them out cleanly if they are old.
The resistance between the plastic inserts and the aluminium IM is to much for the inserts to go in,unless you clean the threads in the IM. We did this with a brass insert,which still proved difficult until we cleaned every bit of debris from the threads,using a thread file,even then you have to be very patient, new ones dont like going in,and you are not long cross threading them.They are not expensive so buy a couple extra just to be sure.

[Jon441cc]

Have the engine warm when removing and installing the injector inserts they seemed to come out alot easier that way the last time i changed a set.

[UrS4boy]

What is this please ? When I pressed very gently the throttle there is a kind of first move before it open the manifold and "tick".
Is this normal operation ?

Did you see this in the link I pointed you to? 1.3 deg of rotation is normal before you get the "click". ("Tick" is a biting insect):

http://forums.quattroworld.com/s4s6/msgs/20405.phtml

[vertigone]

Yes i've read all the documents but I find that " my click" is coming very fast, few mm moving (don't know how to check 1.3°), yours does the same ?
I'll try to make video to show you

thanks for all your support guys !

[vertigone]

Update :
IM removed, injectors hole rings changed, injectors rings changed, IM gasket changed
I've just finish remounting all the things
Will give key turn tomorow, cross the fingers all night now ...

[vertigone]

Hi all !

After some days driving it seems i've sorted out !!

No more hesitate @ 1500rpm, no more rough sound at exhaust
boost is back to 1.4b OB , 1.1 red line

to resume what i've done :

boost leak detection
change injectors o'rings
change injector rings on IM
check every Ohms value with audi databooks
adjust dashpot throttle !!! (throttle body was claping to fast when release pedal)
adjust the TPS after the dash pot !!!
... drink a Leffe ...
go drive test !

Hop it can help other !

thanks for you support anyway !

[220bhp]

Hi all !

After some days driving it seems i've sorted out !!

No more hesitate @ 1500rpm, no more rough sound at exhaust
boost is back to 1.4b OB , 1.1 red line

to resume what i've done :

boost leak detection
change injectors o'rings
change injector rings on IM
check every Ohms value with audi databooks
adjust dashpot throttle !!! (throttle body was claping to fast when release pedal)
adjust the TPS after the dash pot !!!
... drink a Leffe ...
go drive test !

Hop it can help other !

thanks for you support anyway !

Sorry but I do not understand what you mean by,adjust dashpot throttle,or throttle body claping to fast when release pedal ,or adjust tps after dash pot,
Can you explain what you mean.
Apart from that I am very pleased you have fixed your problem,well done

[UrS4boy]

Sorry but I do not understand what you mean by,adjust dashpot throttle,or throttle body claping to fast when release pedal ,or adjust tps after dash pot. Can you explain what you mean.

He is talking about the dash pot (see photo below). It wasn't adjusted properly to easy the throttle closing so it was slow and gentle (so as to not bang shut). He adjusted the dashpot position and then rotated the throttle position switch so it registered open/closed properly.