Audi Original "S" Cars Discussion forum for the Audi Audi Ur S4, Ur S6, S2 & RS2

1993 UrS4 rough idle when cold

Old 08-08-2015, 01:10 PM
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Default 1993 UrS4 rough idle when cold

I purchased my UrS4 in december 2014 and when I had a lot of hesistation under WOT. Since then I upgraded to the 2.0t red top coil conversion and the hesistation at WOT is gone at WOT but it is there between gear shifts.

What I have tried is disconecting the ISV and the rpms go up to 1k. Rough idle is gone and hesistation between shifts is gone but I do get a check engine light.

What is going on? Please help!
Old 08-08-2015, 02:29 PM
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Almost all the info you need to solve your AAN problems can be found by clicking on the appropriate labels in this live version of the UrS4/S6 Engine Bay Device Map

http://members.shaw.ca/speedtek/UrS%...ice%20Map.html


Last edited by UrS4boy; 08-08-2015 at 02:54 PM.
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