Revs dropping when lifting off

[sidrick]

Cheers guys.

[UrS4boy]

G69 / F60 Throttle valve position potentiometer /idle switch information

Any thoughts on the vid?

Looks normal to me.

Here is some Throttle Position Switch/Idle swithc info (including testing):

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

Which was accessed by clicking on the G69 / F60 Throttle valve position potentiometer /idle switch information label in this diagram (all the labels are hot links for future reference):

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

[Henkjan]

You can hear the microswitch click but it's quiet so engine off in a quiet place. Open the throttle and then close it and listen

also grab a multimeter and measure the resistance (pin 2 and 4 iirc, can someone check pls) of the idle switch in the throttle pot, it should be 0 ohm when closed; mine was ½ohm and that was enough to upset the ecu and not stabalise the idle. after replacing the TP with a new one, idle run is as it should be again

[prj]

99% of the time these problems are caused by air leaks.
Adjusting switches, changing sensors etc are usually done to just mask the problem.

[sidrick]

Any thoughts on the vid?

[sidrick]

Excuse the terrible video guys, but does this look right for the dashpot operation?

http://s126.photobucket.com/albums/p89/adolftitler/?action=view&current=SDC13530.mp4

[sidrick]

Gents

Again proving why this is the #1 forum in Audi-land.

[andyg plym]

no need for bumper off

[Rusty]

Don't think so, should be able to get to the bolts with a ring spanner ok.

[sidrick]

While the gurus are here, on a completely unrelated subject, is an alternator replacement a bumper off job?

[sidrick]

Thanks guys, I'll give those two a check tomorrow

[UrS4boy]

Got this on my 3B

Nice to see my AAN photo being put to good use.

[Rusty]

You can hear the microswitch click but it's quiet so engine off in a quiet place. Open the throttle and then close it and listen

[vertigone]

Got this on my 3B

Solved by adjusting the dashpot . It wasn't adjusted properly to easy the throttle closing so it was slow and gentle (so as to not bang shut). I adjusted the dashpot position and then rotated the throttle position switch so it registered open/closed properly.

[sidrick]

Check the idle switch on the tps is being triggered too

I thought this too, but wasn't exactly sure how I check