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Chevy Blazer

What causes an intermittent knocking sound from underneath a 1998 Vectra 1.6 16V while being driven when a new exhaust has been fitted?


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2006-08-04 14:44:36
2006-08-04 14:44:36

You need to take the car back to where the exhaust was fitted.It's quite common to need a couple of goes at aligning the system,most likely cause is the rear box needs the clamp slacking and push the box on a bit more to clear the rear panel.It takes very little contact to make a dreadful noise.The engine flexes over under accelleration and moves the exhaust back and forth in it's rubber mounts.

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Vectra exhaust parts can be purchased from online mega-retailers such as eBay or Amazon. One may also be able to purchase them from car dealerships as well.

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Underneath the steering wheel on the right hand side

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by using obd2 scanner from your local garage

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You really need to specify year and engine type,however,most vectra thermostats are in an aluminum housing on the top/front of the cylinder head,right hand side near the exhaust manifold.If this is no help,post again with details.


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