Noise Quiz: I name that Tune in...
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Ooops.
Previously:
2009 Honda Civic :(
C5, C5, Xantia, BX, GS, Visa.
R4, R11TXE, R14, R30TX - x 4917
Interestingly enough I may have a solution
On returning home this evening I decided to look under the bonnet to see how easy - or not - it would be to pull the leads off the reversing light switch and stick a nail in them to test the reversing light.
While I was peering into the gloom (no, didn't remove anything) i heard a similar "angry bee" sort of noise from around the same area that you indicate.
I was the aircon/ventilation flaps closing. Went on for a fair while, not as loud as yours but in the right location.
Perhaps one of the motors is stuck on, or the flaps jammed and the motor constantly trying to shift it? won't do it much good in the long run if it is.
Does the aircon/ventilation work as it should?
ED: Damnit, Dommo's post wasn't there when I started scribbling
On returning home this evening I decided to look under the bonnet to see how easy - or not - it would be to pull the leads off the reversing light switch and stick a nail in them to test the reversing light.
While I was peering into the gloom (no, didn't remove anything) i heard a similar "angry bee" sort of noise from around the same area that you indicate.
I was the aircon/ventilation flaps closing. Went on for a fair while, not as loud as yours but in the right location.
Perhaps one of the motors is stuck on, or the flaps jammed and the motor constantly trying to shift it? won't do it much good in the long run if it is.
Does the aircon/ventilation work as it should?
ED: Damnit, Dommo's post wasn't there when I started scribbling
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YEah aircon works. It is this part though making the noise I put screw driver on it and it buzzes. The garage owner who did my head gasket felt it last night and he said he could feel it vibrating. Not sure what it is. I did ask the garage today to check it but no mention and I forgot to ask.
C'est pas possible!
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Those vacuum solenoid valves are controlled by a modulated DC, so, the sound could be the coil of the solenoid humming with whatever may be being applied to it in terms on a modulated square wave of 12V DC.
Just like the humming of an electrovalve on a hydractive Xantia.
Just like the humming of an electrovalve on a hydractive Xantia.
Cheers, Kev
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
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Sorry about that, When you said you're NON mechanical I thought that you must be electrical.. LOL
What I'm trying to describe is a method of getting a voltage which is variable from a fixed 12 V battery/alternator.
See if this makes sense:-
If you put full battery volts onto a component then thats 12 Volts.
Now, if you have an electronic board which switches the volts on for say 1 second and then off for 1 sec then back on and off and on repeatedly then that means you get an average of 6 volts applied. i.e. 12v for 1 sec and zero for 1 sec gives average of 6 volts over the 2 seconds.
If you switch on for 1 sec and off for 3 secs and then on and off for the same period over and over , you get an average of 3 volts i.e. a quarter of the full volts.
The control solenoids on the C5 engine are controlled in this way to change them from fully open to partly open or fully closed, but, the switching is much faster than 1 sec at a time.
So, your buzzing solenoid is probably receiving a quickly switched 12 volts to achieve a much lower average voltage and this choppy supply is probably causing it to buzzzzzz.
Your solenoid may not be faulty at all, it could just be noisy. The electrovalves on the Xantia buzzz like this because once they're switched at 12 volts the electronic control then chops the 12 v to give an average of 3 volts to hold the electrovalves in the on position.
What I'm trying to describe is a method of getting a voltage which is variable from a fixed 12 V battery/alternator.
See if this makes sense:-
If you put full battery volts onto a component then thats 12 Volts.
Now, if you have an electronic board which switches the volts on for say 1 second and then off for 1 sec then back on and off and on repeatedly then that means you get an average of 6 volts applied. i.e. 12v for 1 sec and zero for 1 sec gives average of 6 volts over the 2 seconds.
If you switch on for 1 sec and off for 3 secs and then on and off for the same period over and over , you get an average of 3 volts i.e. a quarter of the full volts.
The control solenoids on the C5 engine are controlled in this way to change them from fully open to partly open or fully closed, but, the switching is much faster than 1 sec at a time.
So, your buzzing solenoid is probably receiving a quickly switched 12 volts to achieve a much lower average voltage and this choppy supply is probably causing it to buzzzzzz.
Your solenoid may not be faulty at all, it could just be noisy. The electrovalves on the Xantia buzzz like this because once they're switched at 12 volts the electronic control then chops the 12 v to give an average of 3 volts to hold the electrovalves in the on position.
Cheers, Kev
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
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Just had a thought about these solenoids.. They must need a diode to release the energy stored in the coil when the DC is switched off.
The problem could be that the diode on your noisy solenoid has failed.
On the Xantia electrovalves a standard mod is to fit a new diode.
It's probably going to be easier to just change the solenoid.
It would be interesting to see if a diode mod would work.
The problem could be that the diode on your noisy solenoid has failed.
On the Xantia electrovalves a standard mod is to fit a new diode.
It's probably going to be easier to just change the solenoid.
It would be interesting to see if a diode mod would work.
Cheers, Kev
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
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- Posts: 906
- Joined: 07 May 2009, 19:51
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Are the simple to replace. Ie unscrew when car's off (technical I know) and replace with new and that's it or more convoluted?
The garage asked if I wanted them to put car on computer to see if there is anything wrong with them.. LAst time I said yes it cost me 80 quid for nothing.
The dealer put it on the lexia but never mentioned anything other than height adjusters. What should I do say yay or nay?
The garage asked if I wanted them to put car on computer to see if there is anything wrong with them.. LAst time I said yes it cost me 80 quid for nothing.
The dealer put it on the lexia but never mentioned anything other than height adjusters. What should I do say yay or nay?
C'est pas possible!
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If the solenoid has just suddenly started to make a noticable noise then If it were mine I'd order a new one and go for changing it. It should be easy, probably a retaining screw and a clip on the electrical plug on connector. This will be the cheapest option.
If it's been making a noise for a while but you've only just noticed, then, if your C5 is running ok i'd leave it alone.
If you believe the solenoid is faulty then go for a change.
I've always been dissapointed with a dealer using a Lexia on my car. I've come to the conclusion that dealers are only good at selling cars.
If it's been making a noise for a while but you've only just noticed, then, if your C5 is running ok i'd leave it alone.
If you believe the solenoid is faulty then go for a change.
I've always been dissapointed with a dealer using a Lexia on my car. I've come to the conclusion that dealers are only good at selling cars.
Cheers, Kev
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.