lukasraven5
C30 Idle Air Control Valve Issue
Summary of the thread
A 2008 Volvo C30 with a gasoline engine was experiencing stalling at idle and a check engine light, indicating a potential issue with the idle air control (IAC) valve. The problem was suspected to be the IAC valve itself. A suggestion was made to clean the throttle body, as a heavily contaminated intake could cause similar idle issues. Ultimately, a professional diagnosis revealed a heavily contaminated intake and a faulty IAC valve, leading to a replacement and thorough cleaning, resolving the issue.
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4 comment(s)
lukasraven5 (community.author)
Throttle body cleaning... hmm, not recently. I've done basic maintenance, but never really focused on the intake. Is cleaning it myself a pain, or should I just bite the bullet and take it somewhere? Any special cleaners needed?
evafischer1
Cleaning it isn't rocket science, but it can be messy. You'll need throttle body cleaner and some basic tools. If you're not comfortable, or just don't have the time, a shop can knock it out pretty quick. However, given the stored error and stalling, it might be more than just a cleaning will fix. Getting it properly diagnosed at a workshop is probably the best bet.
lukasraven5 (community.author)
You were right. Took it to a shop. Turns out the intake was heavily contaminated, gunked up the IAC valve. They cleaned everything up, but the valve was shot. New IAC valve and a thorough cleaning set me back 425€, but she's running smooth as silk now. Thanks for the help!
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VOLVO
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C30
evafischer1
Sounds familiar. Has the throttle body ever been cleaned? A heavily contaminated intake can cause similar issues with idle speed control. Before replacing the IAC valve, might be worth checking that. Does the engine run okay otherwise?