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svandamme 01-28-2018 08:13 AM

987 chirping sound when migratig from lower to higher revs
Been replacing the water pump, and coolant assembly
and got the Sebing TT exhaust tips on it as well.
replaced the belts and the tensioner roller as well.
car runs good sounds great, less by noises then before.

so now i'm hearing new noises :)

There is this chirping sound, a resonance i get when i'm pulling through the revs at around 4800 rpm.
I don't always here it, like if i pull low speed high gear, for a slow rev, i don't get it.
But when having fun on the small and fun roads.. there is this clear resonating chirp at around 4800.
At furst I thought it was an exhaust mounting nut loose and resonating, but it's not, drive it with the cover off and it sure comes from the engine itself.
But sounds less out of the ordinary with all the other sound (engin cover off = loud)

Is 4800 that when the Variocam kicks in for the 2.7?
Anybody else have ever heard this?

tonythetarga 01-29-2018 05:06 AM

Check your spark plugs.

svandamme 01-29-2018 05:28 AM

I've read that, but i haven't touched the plugs, they have been in there for a long time..
I would think they don't come loose years after install?

svandamme 01-29-2018 05:33 AM

hmm, apparantly not for that other guy, had one come loose after 35000 miles
Guess I know what to do this evening.. These days I have a habit of parking it's rear on the lift when I come home. Saves me the hassle from having to start it cold just to lift it :D

tonythetarga 01-29-2018 06:36 AM

On the bright side, it will give you a look at the condition. Be careful with the plastic clips that hold the coil pak, they’re a bit flimsy.

svandamme 01-29-2018 06:57 AM

I've had spare plugs laying around for quite some time, but have been hesitant to go that route because of them coilpacks... heard the boots tear and what not..

all that plastic on modern cars is terrible.
never had such worries on my old 73 targa.

Obviously I had other worries there, since the chassis wasn't made galvanized and half made out of Stainless steel like the gator

In retrospect, I wish the 73 had more plastic & stainless and less rust:D

svandamme 02-03-2018 05:10 AM

Left bank plugs were not loose, and while I was in found that my coilpacks are cracked, so there's that.. Ordered me 6 new ones.. I hope they are the right ones or come with the new bolts.
The one near the cat was the worst, but they all had cracked housings, and I was on borrowed time with these.

Got a borescope in the plughole, pistons looked good, not much carbon.
it's one of them 5 bucks Aliexpress scopes from china.. so not all that great, could not pan the head around to see the cyllinder walls.

Buttoned her back up with left side plugs done, i'll do the rest when the coilpacks arrive, so i don't have to redo 2 sides later on.

svandamme 02-09-2018 11:24 AM

yo Tony,

got the plugs replaced and new coilpacks.
none of the plugs were loose, but the boots of the cp connectors on the right side were not on right, connectory in , but boot was not covering it.

3 out of 6 cp's were 1 foot in the grave, it's a miracle i didn't have any misfires when driving in the wet.

First drive, no chirp, but it's near freezing, dark, and did not do that many spool ups past 5K.
Will know more tomorrow, but it looked good.

tonythetarga 02-09-2018 12:12 PM

Hopefully you nailed it. I had a couple of clips break on the cp connector and ended up using some silicone sealant to snug them on. A dab on the outside to the cp instead of the snap. Seems OK so far. Good luck!

svandamme 02-09-2018 01:27 PM

The entire area is a pain in the ass, there is little room and those pesky germans felt the need to put hoses in front of at least one CP on each side.. and to think i don't even have big hands.

I think the chirping might have started from the slight drop on the engine for the coolant pipe works..and perhaps the boots got pushed off when the engine went back in it's normal place.

a 911 with it's engine in the back is so much more accessible for DIY...

svandamme 02-10-2018 05:27 AM

chirping not gone, but it seems less.

Its like a resonance, I'm starting to think there might be a loose bolt on one of the exhaust flanges..
Will have a look at that when the current freezing temps are over.. too cold do lay on my back on a concrete floor right now.

tonythetarga 02-11-2018 10:13 AM

Could be. Exhaust leaks tend to quiet down after heating up and expanding gaskets etc. could it be pulley or idler related?

svandamme 02-11-2018 11:02 AM

nah, idler pulley got replaced

But I don't think exhaust leak as such
I'm thinking a bolt without a nut, in the flange hole.. can't get out, and rings at some noise..

I need to get her ass up to look, but it's been cold, wet and snow and then we had blue skies this morning:
just wanted to go for a drive.

To be honest, the chirp is barely noticable.

It all ended back at the usual watering hole
Cause she does have a bit of a drinking problem :

tonythetarga 02-12-2018 06:10 AM

I'd wait for warmer days too. Not serious enough to worry about but noticeable enough to piss you off slightly!

svandamme 06-13-2018 12:40 PM

FFWD half a year later.
whatever it is, it did not stop my Gator from going around SPA & the Nurburgring at speed.
I think it's just part of the engine's character , it chirps somewhat. Maybe it's the exitement from revving up

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