Question about 2000 Volvo S40

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Hi, I have a 2000 S40 Volvo. Of late it has started to behave abnormally. The engine idle speed is has high as 2000rpm, but it goes down to normal as soon as the aircon is ingaged. I have also noticed that the aircon keeps on engaging and disingaging at regular intervals. but that was not hte case before. Could you help me?

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Yes it sounds like eithor you have a vacuum leak or your idle air control motor is out or going out test the iac motor too see if that the problem with a small jumper cable hope this helps

Posted on Sep 13, 2010

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Posted on Jan 02, 2017

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YOU MAY HAVE A IDLE SPEED CONTROL VALVE PROBLEM, CLEAN IT FIRST, THEN DISCONNECT THE BATTERY, FOLLOW THE PROCEDURE I HAVE ATTACHED.

Here is the most common cause of this stall and idle speed issues, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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2000 Volvo S40


one unit that operates ratio changes and is connected to the engine is that vacuum operated actuator on the transmission
it is possible that that unit is failing , vacuum hose is leaking and that will cause ratio changes as the vacuum varies
run the fault codes to check for wiring problems or VSS or TCM problems as well

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