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Idle Air Control Valve (IAC) Cleaning DIY

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IAC cleaning tutorialIt got warm here a couple of days ago for the first time this year (~80-85F) and our ’97 855 GLT Volvo at 155k miles suddenly started to have a wandering idle speed and stalling at idle, but only when the car was fully warmed up.

The stalling symptom was worst right after restarting the car after it had been running for a while (hot start). I first tried disconnecting the MAF but this did not change the wandering idle and stalling.┬áSo, I read up on stalling and rough idle on MVS, found a good post by Ozark Lee and so decided to remove the IAC and give it a good cleaning. Since there wasn’t already a good illustrated write-up, I took some photos along the way:

Cleaning DIY: 850 IAC (Idle Air control valve) cleaning


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One thought on “Idle Air Control Valve (IAC) Cleaning DIY

  1. My Volvo 850, 1994 I think the IAC is bad,my car started good but in down ,start up and down and turn off ,and run perfect but in I am Stop in a light in the traffic the car shuts off . What do you think is?

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