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Troubleshooting Idle Dip in T7 9-3 SE

741 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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nice IAC...

no, I'm not sure if I have one or not... I guess I'll investigate this weekend, but when I checked on the WIS, the T5 engines have a section on the IAV and the T7 engines don't.

Interesting that you mention the fuel pump... the last time I was at the dealer I asked him what that hydraulic sound under the car was when I put the key in the on position before starting, and he said it was the fuel pump. However, recnetly it has been making this crunching sound when I put the key into the on position... anyone else had this happen?
Was anyone else able to verify if there is or is not an IAC valve in the T7 cars?
Ok.. nosed around a bit under the hood this weekend. Definite no on the IAC valve on T7's. No plenum, no IAC valve, no nothing...

Did notice a disconnected hose that had once been connected to the throttle body however... reconnected it and viola, idle dip gone.

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