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Troubleshooting Idle Dip in T7 9-3 SE

740 Views 7 Replies 3 Participants Last post by  gutmoburb
Hello all... was hoping to get some insight into the possible causes of my idle problem in my 2000 T7 9-3 SE. I've done a bit of reading on other's posts, and it seems the most common cause is the Idle Speed Control Valve becoming dirty. I believe the T7 cars do not have this part however... is this true? I've also tried cleaning the Evap Canister Purge Valve as was recommended in other posts, but this had no effect.
To describe the problem, I find that my idle has a tendency to dip from its normal state of around 950 or so all the way down to 500. This nearly stalls the engine, though the engine management system seems to correct it and bring it back up to normal. This pattern will continue a few times before the engine finally settles back to normal idle. This only seems to happen when I'm driving in the city and making frequent stops. It won't happen if I just start my car and let it idle. I have to be coming to a stop after just having put load on the engine. It happens with both a hot and cold engine, day or night, wet or dry, etc...
So... I'm at a loss personally and was hoping someone might have some insight, or at least a recommendation on what to have the dealer troubleshoot when I take it in next time. Many thanks in advance!

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This is probably very far from what is going on, and I am not a mechanic, but it made me think of my 88 VW Jetta.

Same thing used to happen to that car, and it turned out I had a bad fuel pump, it would often happen when pulling out or stopping.
Funny you mention hearing the fuel pump. I do not hear the fuel pump in my 2002 9-3 at all when I turn the key to "on", and I imagine the cars are mostly identicle. But it was very loud in my jetta :suprised; When I turned the key I would hear this rrrrrrrrrrrrrrrrrrrrr noise.
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