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A noisy cricket

Stryke911
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Stryke911 Member

Stryke911

Posted
Posted

Hi ! So ... I have a problem with my 986 S (2000). The pitched noise is like an angry cricket, really noisy, inside and outside the car, occuring sometimes between 680-2800 rpm (and never when > 3000 rpm). This last one is totally independent from the running engine (like : grik... griiiik grik... griiiiiiiik.... grik... grik............ grik..... stop during few seconds, and continue).

 

My IMS seems good, because I didn't find any plastic or metal piece captured inside the oil filter. I don't have any fault code with my Durametric (V3). I recently removed the accessory belt and the noise was audible. I also checked the clutch, my spark plug... everything is ok. My car works like a normal Porsche, but with this noise...

How can I separate the provenance of the noise between the ...
...Chain tensioner ?
...Gearbox ?
...Secondary air pump ?
...Separator air/oil ?
...Worn chain guide ?

I think that it's a real big challenge for you, because nobody was able to tell me what I have to change to fix it... I also have a vidéo with the noise :



Please, help me... I'm looking for a solution from 6 months..
Ahsai Member

Ahsai

Posted
Posted (edited)

You can try to use a mechanical stethoscope to poke at different components on the engine to identify the noise better. Be careful at the rotating parts of the engine though. http://www.amazon.com/Lisle-52500-Mechanics-Stethoscope/dp/B0002SQYSM

 

It sounds a little like the purge valve (the valve attached to Part #14 here) http://www.autoatlanta.com/porsche-parts/hardparts.php?dir=986-97-04&section=107-10

Edited by Ahsai
Stryke911 Member

Stryke911

Posted
  • Author
Posted

Oh, It's really interesting ! I'm going to check mine, tomorrow...

 

Hum... can you explain me how this noise can be made by the purge valve ?

Ahsai Member

Ahsai

Posted
Posted

At 54-57s in your clip, the noise sounds like something clicking. The purge valve is a solenoid driven by electrical pulses. It opens and closes quickly to modulate the correct amount of fuel vapor mixed into the intake. Sometimes the valve gets loud when it gets old.

Ahsai Member

Ahsai

Posted
Posted

Ok, I hear it now. Quite subtle in the clip and it's drowned out by the engine noise.

 

I don't know what that noise is though but if it's there consistently and also at cold start, you may want to remove the serpentine belt and start the engine briefly and see if it's still there. Also want to hand spin all the pulleys to check if they are quiet and smooth when the belt is off.

 

Also may want to check all the heat shields to make sure they are not rattling.

Stryke911 Member

Stryke911

Posted
  • Author
Posted (edited)

I already did it...

 

After the belt removed, the noise was audible (only when the engine is hot/warm)... never at cold start...

 

I also removed every heat shields and put a special thermal braid (from racing competition) - it was a good idea, but...  nothing changed...

 

Do you have another idea ??

Edited by Stryke911
Ahsai Member

Ahsai

Posted
Posted

Will be useful to point out the exact time of the noise in the clip. I think it's most prominent @ 1:30-1:34. Is that right?

Stryke911 Member

Stryke911

Posted
  • Author
Posted

You are right, the most prominent noise is between 1:30 to 1:40.

 

I'm fed up about this noise... I can't drive peacefully :(

I always think if I can go back home, when I'm driving... it's terrible... No check engine light, no power loss, just this crazy cricket..!

 

My new spark plugs are coming by postal way, I hope it will fix it .. 

 

Do not hesitate to share my video, with everybody you think, I hope that another person already had this cricket one time, on a Porsche or another car brand, and found the way to eradicate it !

 

Thank you Ahsai for your help ;)

  • Moderators
JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

Yeah, hopefully it's just a loose spark plug!

 

It can also be a defective plug rather than a loose one.  From time to time, we encounter a plug that the ceramic center  becomes loose from the metal base, creating a small but noisy leak.  Usually, this leaves a distinctive mark on the ceramic section where the exhaust is blowing by it.

Ahsai Member

Ahsai

Posted
Posted

Yeah, hopefully it's just a loose spark plug!

 

It can also be a defective plug rather than a loose one.  From time to time, we encounter a plug that the ceramic center  becomes loose from the metal base, creating a small but noisy leak.  Usually, this leaves a distinctive mark on the ceramic section where the exhaust is blowing by it.

That's interesting and good to learn about. Thanks!

  • Moderators
JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

 

 

Yeah, hopefully it's just a loose spark plug!

 

It can also be a defective plug rather than a loose one.  From time to time, we encounter a plug that the ceramic center  becomes loose from the metal base, creating a small but noisy leak.  Usually, this leaves a distinctive mark on the ceramic section where the exhaust is blowing by it.

That's interesting and good to learn about. Thanks!

 

 

The ceramic core of the plug is both mechanically locked and cemented into place to get a seal.  Sometimes the cement seal is not complete and the plug leaks pressure; other times we have found the entire ceramic core loose (moved around, but did not come out of the metal threaded section).  Replacing the plug solved the noise issue.

  • 4 weeks later...
Stryke911 Member

Stryke911

Posted
  • Author
Posted

Hi everyone !

 

So, I finally founded my noisy problem. It's crazy, but I did it, with your help !

 

http://www.rosepassion.com/fr/cat/porsche-boxster-986-2000-boxster-s-3-2-cabrio-boite-manuelle-6-vitesses/M484/moteur-et-alimentation-essence/refroidissement-moteur/B82/tuyau-eau-partie-1/I619/support/P57062

 

This piece was just broken........ and makes, every days, the famous cricket noise...!

 

THANK YOU !

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