What's this noise? 1999 996

[oAllElseFailo]

There's some clunking noise coming from inside the engine bay, I don't know if its internal or external.. then again I don't know what it is period.

There's no loss of power in the car and it drives fine even after accelerating and letting it coast the noise lessens but when the car slows down the noise hightens again and when it idles it slowly drops its RPMs until it dies, ontop of that there's a hole in the radiator hose which i don't know would cause a problem of this clunking but would anyone have an idea of what it may be? It's a 1999 996. Thanks.

[Blackie911]

Don't worry about it- likely the engine is about to grenade- which is normal for 996.

[Oh Haha]

More info would be helpful and maybe a post over in the 996/Boxter forum would yield better answers.


Do you have good oil pressure at idle and does it increase with RPM's?

Does the noise rise and fall with the RPM's?

How many miles on the car?

It could be as simple as a pulley or as difficult(expensive) as a rod/crank bearing gone.

[oAllElseFailo]

The car has 65958 miles on it, the oil pressure stayed the same on the gauge at idle and driving it didn't seem to drop at all. As for the noise, it's more of a hard clunking at low RPMs and a faster lesser noise clunking at higher RPMs.

[Oh Haha]

Well, that's a good sign as it sounds like the oil pressure is good.

Any way you could post a video?

[maxnine11]

transmission !?!

(let me know if i win)

[gsmith660]

let off the gas, humm maybe a rod bearing going south?

[oAllElseFailo]

I do have a video although the sound quality is very bad, you'd have to listen closely to hear it but i can't seem to upload it. The normal site i use to upload videos/pictures is taking about 30 minutes, if not failling, to upload a 30 second video..

[gsmith660]

Originally Posted by oAllElseFailo

The car has 65958 miles on it, the oil pressure stayed the same on the gauge at idle and driving it didn't seem to drop at all. As for the noise, it's more of a hard clunking at low RPMs and a faster lesser noise clunking at higher RPMs.

I hope it went up about 10 lbs\1000 rpm if it stayed the same you have an oil pump issue

[oAllElseFailo]

Originally Posted by gsmith660

I hope it went up about 10 lbs\1000 rpm if it stayed the same you have an oil pump issue

well the gauge goes from 1-5 on the car and it stayed at 5 the whole time from idle to driving...

[gsmith660]

Pegged high means it is in a failed condition either the sender is bad or it is not grounded good. does it have teflon tape on the sender? That is a bad thing.

[oAllElseFailo]

Heh i dont know what a teflon tape is >< here's a video though, it's bad quality

http://www.youtube.com/watch?v=iYxtqjzFwG4

[ToddM]

Originally Posted by blackie911

don't worry about it- likely the engine is about to grenade- which is normal for 996.

lol :d

[efhughes3]

I'll point out the obvious here....you posted this on the air-cooled 911 forum. You may want to try the 996-specific forum here, or on Rennlist.

[vreference]

Oh my - that does sound like it's crushing rocks doesn't it? You might have to consider having it towed to a shop.

[oAllElseFailo]

Originally Posted by efhughes3

I'll point out the obvious here....you posted this on the air-cooled 911 forum. You may want to try the 996-specific forum here, or on Rennlist.

oops.. alright guess ill head there, thanks anyways.

[slodave]

What was that fluid dripping right behind the left wheel??

[450knotOffice]

That does sound awful. If I were you I'd flatbed it to a shop.

[aigel]

Connecting rod bearing. Please let us know what it turned out to be.

Sorry, but clunking at engine speed rarely is good news.

George

[BAD930]

sounds like conrod, happened to my 996, time for a rebuild, quite common on the 3.4..