Having problems with your 2000 Volvo S40 ?

I have a 2000 Volvo S40. A few days ago it began automatically accelerating while driving. I took my foot off the gas and the car took off as the tach got close to 4000 rpm I shifted into neutral and pulled over. I had to shut the engine off. The car would not restart. I let it cool down and after a few hours I was able to drive it home. This just started happening and the check engine light is on.

Posted / edited by AnonymousUser on : 15-01-2018

Answers :

I believe it's most likely the Idle Air Control Valve, also known as\015\012the IAC valve. This is what regulates the air intake on a car when your\015\012foot is not on the pedal. Valve should be under the black plastic cover on the front right corner on the engine. Remove the cover and remove the valve. Then clean the valve, gasket seal (may need to replace the gasket) and electrical connections\015\012to it with a Mass Air Flow Sensor Cleaner (or another non-abrasive\015\012cleaner) and reconnect everything. If the cleaning doesn't do the trick, then you may have to replace the IAC valve altogether.

Since you said the check engine light is on, you can\015\012have your car computer scanned to retrieve the code that\015\012the computer would have stored when the light triggered. Most garages\015\012will do this free of charge. The code will tell you what may have\015\012caused the light to initially turn on.
Repair Help & Product Troubleshooting for 2000 Volvo S40

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I have a 2000 Volvo S40. A few days ago it began automatically accelerating while driving. I took my foot off the gas and the car took off as the tach got close to 4000 rpm I shifted into neutral and pulled over. I had to shut the engine off. The car would not restart. I let it cool down and after a few hours I was able to drive it home. This just started happening and the check engine light is on.

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