Q: Erratic idle on cold start 2007 Audi a3
I have a 2007 Audi a3 the first time I start my car in the morning is usually rough, it seems to crank slow but always starts up. After it starts the rpm is pretty erratic it goes up and down from 1000rpm down to 600rpm and back up and down. After the car warms up it idles fine. The car drives fine after the fact, it's an automatic also the check engine light seems to come and go but the idle problem doesn't stop.
My car has 113000 miles.
My car has an automatic transmission.
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Hi Steven. Thanks for the question today. In most cases, what you’re describing is caused by either a failed cold start injector, mass air flow sensor, or an idle control valve that is clogged with excessive carbon deposits. This is rather common in vehicles about 10 years old. Before you decide to make any repairs, it’s best to have a professional mechanic come to your location and complete an on-site inspection first.
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