Best Answer

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.

2006-08-04 14:44:36
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: What causes an intermittent knocking sound from underneath a 1998 Vectra 1.6 16V while being driven when a new exhaust has been fitted?
Write your answer...

Related Questions

Where can you buy Vectra Exhaust?

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.

Where is the Fuse box on a vectra?

Underneath the steering wheel on the right hand side

How do you reset the Exhaust emission light on a 03 vectra?

by using obd2 scanner from your local garage

Where is the thermostat located on a Vauxhall vectra?

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.

What is the difference between a vectra b or a vectra c?

vectra b is the earlier engine

What might the problem be if your 1800cc Vectra PETROL is very noisy when running and under acceleration it gets even worse?

stands a chance to be the cam if its a knocking noise or it might just be the alternator...the bearings go dry & need changing!! but its hard to get to!! could be cambelt tensioner and rollers water pump or lack of oil first two could cause catastrophic engine loss if left Could also be a blowing Exhaust manifold gasket, or cracked exhaust manifold. "noisy engine" can be caused by "many things".

How do you fit towbar on vauxhall vectra c?

Will a tow bar of a vectra b fit a vectra c

When was Opel Vectra created?

Opel Vectra was created in 1988.

Does a vectra sri dti 16v engine have a cambelt?

whAT is the difference between the sri vectra xp and the sri vectra 16v

Where is the crankshaft position sensor on a 1999 Vauxhall Vectra SRi 140?

the sensor is underneath the power steering pump and the alternator, awkward to get to, you may have to remove top fixing for the dipstick housing.

What tire pressure vauxhall vectra 1.8?

Vectra 2.0 diesel

Remove Vauxhall vectra radio?

remove radio out vauxhall vectra

Vectra warning light?

The Vectra warning light is called the engine management warning light. It tells you that you need to get your Vectra checked by a mechanic.

Coolant capacity vectra?

The coolant capacity for a Vectra is approximately 7.2 liters. That would be roughly 1.9 gallons of Vectra coolant capacity.

Where is the fuel cut off switch on vaux vectra?

There isn't one on the vectra.

How do you change the headlight bulbs on a 2007 vectra?

can you change the reflectors on a 2007 vectra

How do you change antifreeze on vauxhall vectra?

how to change antifreeze in vauxhall vectra B

Where would i find the wiring diagram for Vauxhall Vectra?

Vauxhall Vectra wiring diagrams:

Where is egr located on a 1.8 - 2001vauxhall vectra?

Best advice is to go to and or specialists in this area and a great site for vectra owners

What does the engine warning light on the dashboard of a Vauxhall Vectra mean?

look on the vectra forums

Abs sensor vauxhall vectra?

were can i find abs censors on a vauxhall vectra cheers

Picture of fan belt tensioner on vectra?

picture of fan belt tensioner on a vectra

How do you put oil in for the gearbox of a Vauxhall vectra?

how do I fill the gearbox oil on a vauxhall vectra

Which Vauxhall vectra has a timing chain?

vauxhall vectra 2.2 z22se engine has a chain

How do you remove the alternator from a vectra 2.5 v6?

how do you remove alternator on v6 holden vectra