Q: Hi i have knocking sound in my vvt solenoid in my Volvo S40 model 2000 and I changed the vvt solenoid with new one but I still ha

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Hi i have knocking sound in my vvt solenoid in my Volvo S40 model 2000 and I changed the vvt solenoid with new one but I still have the knocking sound !? But if i unplug the cable the knocking sound goes ! What is the real problem ?
My car has a manual transmission.

It is possible that the noise is just a normal function of the solenoid. It is also possible that the new solenoid you have is also a faulty part. If you have a warranty you could try replacing it under warranty to see if another new one would resolve the issue.

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You will need to have the computer tested for codes for the failure and test those codes. It may be a defective sensor for the camshafts.

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