Strange idle connected exhaust vibration

[220bhp]

Played around with my TPS yesterday.. I´m 100% shure that the tps has nothing to do with ur problems! I think u should check ur timing once again! Another thing that came to my mind is to fit a new earth cable between chassi and valve cover!

I am getting good boost,when hot now,and when the car is cold it runs very well of boost,so I don't think its the cam timing or distributor timing.
I have cleaned and checked all the earthing points,but I agree an additional strap would be a good thing,but what do you mean when you say from chassie to valve cover,or do you mean the inlet manifold,where the others are.
Thanks for your help,it is much appreciated,along with everyone else

[newsh]

The fact that it clicks doesn't necessarily mean the TPS switch is working, I think I would try a continuity test between pins 19 and 52 at the ECU connector and operate the throttle, you should see the continuity come and go as you do so. At least this will prove that the ECU is getting the switch signal.

[Carfreak]

I am getting good boost,when hot now,and when the car is cold it runs very well of boost,so I don't think its the cam timing or distributor timing.
I have cleaned and checked all the earthing points,but I agree an additional strap would be a good thing,but what do you mean when you say from chassie to valve cover,or do you mean the inlet manifold,where the others are.
Thanks for your help,it is much appreciated,along with everyone else

That´s good On the right way then

There can be a bad earth between the head and chassi because of the gaskets, oil and other stuff that could cause bad earth on the coil housing or are u running stock coils ?

I had a quite bad earth between engine and chassi so I installed a wire between them and the improvement was noticable on the multimeter.

It´s better to try out the cheap stuff first even if it seems worthless

Do u have vag-com ? u can check the blocks on the tps idle switch, the value should change when opening the throttle - if not, replace the tps

[twoqu]

Carfreak - its a 3B so we have not got all the ABY/AAN measuring blocks. We get 10 in total!
I agree with John, this is a bit fiddly. Need to make sure the TPS idle switch is set without altering the closed position of the throttle. Need an extra pair of hands/eyes really.

[220bhp]

The fact that it clicks doesn't necessarily mean the TPS switch is working, I think I would try a continuity test between pins 19 and 52 at the ECU connector and operate the throttle, you should see the continuity come and go as you do so. At least this will prove that the ECU is getting the switch signal.

I will try this when it stops raining John.I am getting quite used to squessing my skinny little body down there to take a reading

[newsh]

I will try this when it stops raining John.I am getting quite used to squessing my skinny little body down there to take a reading

I was just thinking that must be the case!

Maybe you can get the meter probes in position and reach over and press the accelerator pedal?

3Bs are a pain in this respect compared to ABY/AAN but we love em At least the coil lasts for ever! You wouldn't believe how much stuff you can look at in vagcom on the RS4, it's ridiculous

[220bhp]

Stop braging while I am in pain.

[newsh]

Don't talk to me about pain I just forked out the price of a 3B to get the RS4 back

It goes now though..

[220bhp]

I did'nt mean the price,I ment the pain I feal gettng down to check it.

[newsh]

[Acidburn]

Just sat and read thru the whole thread so i've got a bit more idea what needs looking at. I'll see if all goes well and come down next weekend to have a look.

[220bhp]

That would be brilliant Pete

[220bhp]

Today I replaced the two valves in the pcv,took of the hoses and checked for cracks etc,but did not find any.
Took of the throttle body as well,and set the TPS up on the bench.checked every vac hose,and all the other boost hoses.found no leaks.Car is still the same.idle polsates at 1450.
idle still high

[220bhp]

Forgot to mention that I also swopped the carbon canister valve,for the one of my s6,just to be sure its nothing to do with the problem.no change.

[newsh]

The fact that it clicks doesn't necessarily mean the TPS switch is working, I think I would try a continuity test between pins 19 and 52 at the ECU connector and operate the throttle, you should see the continuity come and go as you do so. At least this will prove that the ECU is getting the switch signal.

Done this yet?