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Old 13.01.2011, 10:15
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Knocking sound in the car

Maybe some car-savvy members might have a clue. My car, 6 cylinder Opel, has been shuddering a bit when idling, runs fine while driving. A bit of a knock-knock thudder-thudder, if you know what I mean.
If it continues, will visit a garage, but thought maybe somebody knows of a possible reason?
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Old 13.01.2011, 10:16
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Re: Knocking sound in the car

It's obvious, you have a midget in the trunk.
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Old 13.01.2011, 10:18
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Re: Knocking sound in the car

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It's obvious, you have a midget in the trunk.
Did you put it in?
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Old 13.01.2011, 10:21
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Re: Knocking sound in the car

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Did you put it in?
...well, on one of my nightly escapades I must have left her in the trunk along with the baby Pony, some lube and a pack of Newports. My bad!
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Old 13.01.2011, 10:23
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Re: Knocking sound in the car

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Did you put it in?
Men's most dreaded words...
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Old 13.01.2011, 10:25
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Re: Knocking sound in the car

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...well, on one of my nightly escapades I must have left her in the trunk along with the baby Pony, some lube and a pack of Newports. My bad!
You should be reported to the animal lovers' society!

Still looking for serious answers without sexual connotations..
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Old 13.01.2011, 10:26
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Re: Knocking sound in the car

It sounds like not all cilinders are firing when revs are low. Change spark plugs, maybe HT leads.
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Old 13.01.2011, 10:27
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Re: Knocking sound in the car

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Did you put it in?
Really, honey, why would you say that?
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Old 13.01.2011, 10:33
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Re: Knocking sound in the car

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Really, honey, why would you say that?
it brings back bad memories...
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Old 13.01.2011, 10:34
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Re: Knocking sound in the car

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You should be reported to the animal lovers' society!

Still looking for serious answers without sexual connotations..
..well, you have to understand, that it's kinda hard to diagnose an issue with your vehicle without actually seeing or driving it. It's lilke if I'd write a thread about some rash I got...it could be plenty of thing and unless Mike Shiva is amongst us, then i doubt it that you will figure out what the problem is with the help of this thread....unless of course some knowledgable kind forumite is willing to take a look at your car....but anyhow, you can release the pony and the midget...but I'll come by later to collect the lube and the pack of Newports.
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Old 13.01.2011, 10:35
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Re: Knocking sound in the car

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...My car, 6 cylinder Opel, has been shuddering a bit when idling, runs fine while driving. A bit of a knock-knock thudder-thudder, if you know what I mean.
.....
Sounds like a classic case of faulty muffler bearings. I'd get it looked at if you are concerned.
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Old 13.01.2011, 10:38
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Re: Knocking sound in the car

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Still looking for serious answers without sexual connotations..
ok ok

jokes aside, nocks or thuds normally signify either a combustion problem (i.e. misfiring / spark plugs problem), the water pump could also be a problem or the belts...

it's not very easy to determine without opening the bonnet and taking a look, things to look out for are oil/water leaks which is highly dependent on the age of the car, so if this is a fairly new car, I would assume it's a misfiring problem. does the car struggle going up hills?

the problem is not going to go away and you might find it will get worse, take it to a mechanic asap...
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Old 13.01.2011, 10:41
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Re: Knocking sound in the car

To be honest it could be a number of things so it might be a good idea to get it to the garage in any event.

The knocking sound worries me though, as when I had similar symptoms it was the big end bearings that had gone (major surgery). However this was on a car that was 15 years old at the time, and that was 20 years ago. That said it could easily be an ignition/timing/fuel mixture problem, assuming that you can still get these problems on these new fangled, injection, everything computer controlled cars. I've only ever owned cars with old fashioned carburetors and mechanical ignition timing.
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Old 13.01.2011, 10:48
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Re: Knocking sound in the car

petrol, diesel etc etc what make? age?

Take a look on the specialist opel forums, knocking noise could be somthing as simple as a purge valve opening and closing but without knowing what engine you have its impossible to say
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Old 13.01.2011, 10:54
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Re: Knocking sound in the car

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petrol, diesel etc etc what make? age?

Take a look on the specialist opel forums, knocking noise could be somthing as simple as a purge valve opening and closing but without knowing what engine you have its impossible to say
petrol, Opel Omega 2.6, 2001
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Old 13.01.2011, 10:54
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Re: Knocking sound in the car

bad rod bearing/loose spark plug/bad spark plug wire/bad spark plug/valve out of adjustment/loose heat shield/exhaust hitting underbody/bad cam/carbon buildup/loose power steering-ac-etc. mounting bolt/timing chain slap/.....

Impossible to do more than speculate, get it to a shop, it could be a simple fix that would turn serious if left unattended. Is this a Manta?

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petrol, Opel Omega 2.6, 2001
Edit- not a Manta .
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Old 13.01.2011, 13:11
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Re: Knocking sound in the car

Does it happen:

1) All the time?
2) Does it happen when you rev the engine (in neutral)?
3) Is rythmic? IE the sound is cyclic?
4) Open the bonnet - face the engine. Listen for the sound - close one ear, than the other - which side is the sound coming from?

Knocking sounds are often caused by something working loose and hitting something else - I thought I knackered by steering - until I realised the engine and gearbox mounts had gone instead!!!

Radiator fan blade broken and thrown into the path of something else?? Belts OK? Exhaust gas recirculation value mounted tightly - these are known to fall off - I'm not kidding!

The V6 is a nice smooth engine - and pretty economical for a 6 - but it has a really poor reliability record

http://honestjohn.co.uk/carbycar/vau...4/?section=bad
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Old 13.01.2011, 13:30
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Re: Knocking sound in the car

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It's obvious, you have a midget in the trunk.
Alternatives that spring to mind:
Stop running over pedestrians
Check that cyclists are hitting your car as you drive past them too close...
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Old 13.01.2011, 14:04
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Re: Knocking sound in the car

To me it sounds like a ten year old Opel. (It is good that you bought the 6 cylinder in order to have some spare ones...)

On a serious note: The current range is supposed to be good, but back then had Opel quite some build quality issues - the company was not doing well and they aparently tried to make money by squeezing their suppliers - which had the effect that the quality of the supplied components suffered. It is impossible to say what is rumbling as pretty much everything could possibly make some sound...
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Old 13.01.2011, 14:08
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Re: Knocking sound in the car

Given the age of the car and the fact that the noise is only present at idle, I'm gonna go with dodgyken. My money says that it's failing engine mounts, gearbox mounts, or exhaust mounts.

If I'm right, the fix is usually measured in $hundreds and not $thousands.
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