audiguy90csq

have a 1994 90cs quattro sport and have had great luck with it up till recently, nothing major, just a minor annoyance. occasionally when i am idling at a stop light the car's engine will almost stall (or a couple times stall) and then just roar back too life. Just kind of goes GLUG .... could it be a o2 sensor going bad? the idle isnt set too low i already checked that. other than that car runs great...any thoughts? Thanks guys.

Blake@NWAutoSalon

Check O2 and maybe your ISV too.

SLAB

try tapping on the ISV with a small hammer...easy way to check for a gummed up ISV


the car will idle normally if the ISV is bad when you tap

audiguy90csq

i'm sorry, im kind of an audi nub, ISV? where should i look? lol, sorry and thanks.

Julian_B

i cleaned ISV and didnt change, thought it was ignition wires and plugs but it wasnt. I finally replaced the O2 sensors and it was fixed, the car came back to life. O2 sensors should be replaced between 60k and 90k.

Julian

SLAB

or IAC = idle air control

someone will be kind enough to post a picture of it in a V6 engine bay

Julian_B

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