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  #41  
Old 13.01.2011, 16:02
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Re: Knocking sound in the car

Catalyst might have gone - that would rattle quite nicely in the casing at idle - you'd not hear it when you are driving due to tyre/wind/music noise.
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  #42  
Old 13.01.2011, 16:04
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Re: Knocking sound in the car

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Catalyst might have gone - that would rattle quite nicely in the casing at idle - you'd not hear it when you are driving due to tyre/wind/music noise.

you usually lose a whole load of power when the cat collaspses
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  #43  
Old 13.01.2011, 16:05
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Re: Knocking sound in the car

After 38 posts we get a reasonable clue.

Am I wrong, or will it be only Opel garages that can access this lamp?
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  #44  
Old 13.01.2011, 16:05
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Re: Knocking sound in the car

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you usually lose a whole load of power when the cat collaspses
No observed loss of power as of now.
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  #45  
Old 13.01.2011, 16:06
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Re: Knocking sound in the car

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After 38 posts we get a reasonable clue.

Am I wrong, or will it be only Opel garages that can access this lamp?

nope anyone with an obd2 reader can see what the issue is have them in all my cars, very handy gadgets indeed, can be picked up from ebay for a few quid.

shame the op isn't near zurich else I could have read the codes for him.

Last edited by bigblue2; 13.01.2011 at 16:20.
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  #46  
Old 13.01.2011, 16:11
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Re: Knocking sound in the car

If catalyser would be faulty, two things would happen: an extreme high fuel consumption and impossibility to pass expertise due to CO2 test failure

(I know, I've learned the lesson already)

As for the red light - it could be anything from sensors. Starting from air intake sensor to engine temperature sensor malfunctions ...

Only obd reader can detect what's wrong
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  #47  
Old 13.01.2011, 16:17
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Re: Knocking sound in the car

here are the standard obd2 codes

http://www.obd-codes.com/trouble_codes/

then each manufacturer has there own extended set on top

always handy to ask your garage what fault codes they read
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  #48  
Old 13.01.2011, 16:19
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Re: Knocking sound in the car

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here are the standard odb2 codes
I guess, you mean obd, not odb?
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  #49  
Old 13.01.2011, 16:21
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Re: Knocking sound in the car

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I guess, you mean obd, not odb?

damn database work frying my brain
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  #50  
Old 13.01.2011, 16:22
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Re: Knocking sound in the car

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damn database work frying my brain
Indeed, indeed. Mine too!
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  #51  
Old 13.01.2011, 16:29
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Re: Knocking sound in the car

Removed groan only cause you said it was a honour to get msg from seeland , so i guess you must be a mechanic with your precise info lol
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  #52  
Old 13.01.2011, 16:30
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Re: Knocking sound in the car

If you were in the US you could phone these guys (cartalk). You can phone them up and they usually correctly diagnose the problem with a bit of chat.

Discussin double -declutching at 2:30,which I had to do on my driving test as the clutch went 30 minutes before the test!




Is it the tappets?

Diagnosing engine noise

http://www.aa1car.com/library/engine_noise.htm
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  #53  
Old 13.01.2011, 16:41
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Re: Knocking sound in the car

Just a bit more info on obd2 code readers, most (if not all) can also clear error codes, especially handy if you have a car that automatically goes into limp home mode when an error is detected (eg VAG group cars) my FIL's brand new audi a6 diesel had the light come on when he came out to see us a couple of years ago, 30mph became his top speed!! read the code, did a quick search for it online, saw it wasn't an issue (a common non-fault requiring a firmware update in the car) so we cleared it and he was able to drive all the way to the channel tunnel at normal speed. course when he turned the car off and back on again the fault came back and the last 40 or so miles where back at 30 mph.
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  #54  
Old 13.01.2011, 16:47
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Re: Knocking sound in the car

My bet regarding these noises is that it is valves not adjusted, as a result cam shafts being weared out quickly. It is common for people to forget about adjustments of valves.

I suffer with it too, mostly with my motocycle (so I do it myself now).
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  #55  
Old 13.01.2011, 16:57
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Re: Knocking sound in the car

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Just a bit more info on obd2 code readers, most (if not all) can also clear error codes, especially handy if you have a car that automatically goes into limp home mode when an error is detected (eg VAG group cars) my FIL's brand new audi a6 diesel had the light come on when he came out to see us a couple of years ago, 30mph became his top speed!! read the code, did a quick search for it online, saw it wasn't an issue (a common non-fault requiring a firmware update in the car) so we cleared it and he was able to drive all the way to the channel tunnel at normal speed. course when he turned the car off and back on again the fault came back and the last 40 or so miles where back at 30 mph.
Our's is always out on loan. We just cleared my friend's who then told us- thanks you saved me I am selling it to this guy- I felt so bad!
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  #56  
Old 15.01.2011, 00:39
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Re: Knocking sound in the car

Sooo, what was the problem? Did mechanic guy find something?
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  #57  
Old 15.01.2011, 09:07
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Re: Knocking sound in the car

pfff what a discussion over a few misfires !

slow week maybe everyone ?
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  #58  
Old 15.01.2011, 09:50
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Re: Knocking sound in the car

Most people seem to be suggesting knee jerk reactions. I had two omega elites and the common problems were the head gasket blowing and the ones which may cause your knocking were usually, big end bearings, tappets or water pump.
Does the temperature change at all, is it knocking or tapping and do they increase or decrease with the throttle? At idle do the revs remain stable at just under a thousand rpm or does the engine hunt? (at idle revs go up and down on their own)?
Have you been to garage yet?

Steve
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  #59  
Old 17.01.2011, 09:58
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Re: Knocking sound in the car

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Sooo, what was the problem? Did mechanic guy find something?
Yes, the guy had a look, and said it was "just something in the gas". He promised to give me some additive to add in the fuel tank and then fill 'er up, that should help. If that doesnt help, he will do some cleaning, he said (what exactly he will clean, I am not sure).
He also said that this problem also happens since I drive a lot of short distances, to and from work (always 5 kms one way), which doesnt give a chance to the engine to clear itself of any small junk.
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  #60  
Old 17.01.2011, 10:01
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Re: Knocking sound in the car

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Does the temperature change at all, is it knocking or tapping and do they increase or decrease with the throttle? At idle do the revs remain stable at just under a thousand rpm or does the engine hunt? (at idle revs go up and down on their own)?

Steve
No, havent noticed any change in temperature (I understand, you mean the engine temp?). It is a kind of thudder that goes through only at small rpms (idling), it goes away during normal driving (or maybe I dont notice it, but the car drives as smooth as before, only this shudder during idling).
No hunting.
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