I did fix a lots of things in my volvo v70 2.4t,replce the MAS,alternator,change the plugs and coil and much more all in a period of 5 months and I am still having a problem with RPM going up and down. the engine light is off, it's just the noise is anoying whene in neutral and whene I make a stop, the car give a kick. I am not sure if is the control valve or something else I couldn't locate it anyway. any tautghs I aprecciated very much.
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2001 Volvo V70 Question: how to fix the RPM from going up and down. I am not sure if it's the valve contr
Answer #1patrick mannion from Greg Solow's Engine Room, December 25, 2011, 20:45Master
It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. Volvo and a lot of European cars are tricky, preparatory tools, some times a software up grade fixes things. Fist check the basics could there be any vacuum leak between the intake manifold and head or intake manifold/throttle body area. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
You may need a professional grade scan tool to look at live sensor data. For Toyota and Lexus we can test the functionality of the idle air control motor using a scan tool. If a repair shop is looking at your car make sure they have good Volvo experience.