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Car Forum / Volvo Cars / November 2007Idle noise - 98 V70 AWD
My wife's 98 V70 AWD has recently (last 3-4 months it has become progressively louder) developed a noise at idle, which stops when the car is being driven. Initially, this was just while the car was in "park" and would subside when put in gear. However, over time, it has become louder and in addition to disappearing when driven, it changed pitch while shifting from park into gear. What might be the cause? Is this something that can be easily fixed at home? Thank you, Dave Adjust idle speed away from something at resonance ? Nick Nick schrieb: > Adjust idle speed away from something at resonance ? Aha!? And how do you want to do just that in real life? With a computerised ignition and engine control? Let us know! > Nick Joerg  SignatureReclaim your inbox! Thunderbird makes emailing safer, faster, and easier than ever before with the industry's best implementations of features such as intelligent spam filters, built-in RSS reader, quick search, and much more. http://www.mozilla-europe.org/de/products/thunderbird/ > My wife's 98 V70 AWD has recently (last 3-4 months it has become > progressively louder) developed a noise at idle, which stops when the [quoted text clipped - 8 lines] > Thank you, > Dave Hi Dave, I think yours is the 5 cylinder engine, similar to my '96 850. I've had the rubber bend on the vacuum line attached to the alternator end of the inlet manifold deteriorate (twice) and produce a very loud "trumpet-like" sound as air is sucked in through a hole. It of course varies with engine load. It's very hard to see and even harder to replace. Have a poke at it with a long stick or something while the noise is happening and see if it changes. It's just below the thermostat housing, and connects to a hard nylon tube that is part of the crankcase ventilation system. regards Barry Perhaps with the OBD programmer ? Nick |
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