Goughary

On mine- it ended up being the bad news I won't mention here - Dont want to jinx anything. But i paid over 1000 dollars freaking out hoping it wasnt 'the bad news' only to find out, it was 'the bad news' - top end rebuild done, it's awesome now.

Good luck with it - I hope it's not the issue I had...That said, I sent my heads to steve weiner (you are in the uk, so doesnt really apply) and we redid the heads with lighter 993 valves and better springs and ti retainers - so at least i got a bit of an upgrade out of the deal...

sschultze09

Goughary, If you don't mind me asking what did that work cost??

Dwane

Check for leaks around the bypass pipe.
You would see the leak on start up if the weather is cold enough. 10c

Goughary

sschultze - PM me to discuss...there was alot of work done since the engine was out. I have basically a new car now...but I assume you are talking the heads only?

Porsche964FP

Just got back from GTOne - my trusted specialists.

Craig, Peter, Dean had a listen - from their experience they fear it's a bearing in the bottom end, the car is also misfiring.

It sounds like a complete engine rebuild. Of course this is only judging by the ears of the wise experts. They will only be able to give me a firm answer when they've had a chance to raise it up and start opening her up.

The engine had a top end done around 40K miles ago - albeit by a non reputable builder who made mistakes which I had rectified during a recent reseal.

Peter has always told me that a bottom end is something not to neglect, especially on a track car - low and behold it seems at this stage mine is a victim of bottom end neglect.

I had been planning on supercharging the engine 'one day' - to that effect Peter had always advised against doing it on a car that had not had a complete rebuild done recently.

I feel that supercharging is now out the window, which to be honest I had been hesitating about following discussions with fellow listers at Spa. The relative bang for buck had seduced me.

I have one of two options at this stage:

1. Sell the car - I'll get bugger all even though the paint is pristine.
2. Rebuild - The thing is I won't see the full value back. But at least it will increase in value if done to a good spec. Maybe Motec.

What dictates the aforementioned options is the cost. I would be digging in far, far into my savings. I may have to sell. Cut my losses and sell.

Having said that this is all based on speculation - it may turn out to be something comparably cheap to repair the 'clicking'.

My state of mind? It's my day off today following a long intense week, my stomach is in knots and my skin is crawling as I type this, it was so sunny this morning.

I so hope it turns out to be nothing - I feel like crying, things were going so well. It feels surreal - a nightmare.

Thank you for all the feedback gents.




No difference.

Nope still the same.

911Jetta

I'm so, so sad to be reading this....especially since you've just basically rebuilt the whole car, and it's a stunner for sure.
What a roller coaster ride you've been on lately!
You can't sell, I can't image you not posting pictures of your car and reading updates!

Andy Roe

Sorry to hear this Frank and hope that it's not what they think. Let's try to rule out any other causes beforehand.

I'm curious - why would a problem with the bottom end cause it to misfire? Maybe it could be a bad plug wire after all? You could check this by disconnecting one of the coil wires at a time to see if the sound goes away. If it does, then you'd know if it's related to that.

Would a broken dizzy belt cause any noise issues?

Good luck!

g60pops

i feel for you especially after all your recent work with the paint etc

alexjc4

I have heard cars that sounded like that where it turned out to be exhaust manifold. Stud snapped as suggested above.

But there is something worryingly "knocky" about it. I total see why they'd say it might be big ends.

If it is exhaust it would probably stay the same hot or cold, if its big ends you'd expect it to get a little better when everything has expanded, and be quieter when hot.

Do get a second opinion: Jaz or Tognola are close by, obviously we had conesations at spa about who to go to for rebuilds.

If it is big ends think about a s/h lump as a temp solution instead of a rebuild.

Got everything crossed for you mate.

GeorgeK

Did they only have a listen? or did they actually look at the engine? Until they have actually looked at the easy to check things, it is a crap shoot.
Look at the exhaust studs
disconnect one ignition, then the other
check plug leads
do an exhaust gas test
compression test

Until all that is done, you are only guessing.

And if you are having thoughts about the potential cost, maybe track work is not for you. Rebuild as needed, forget about the money, and the car's value is restored.

Edit: I stand by exhaust leak. EXACTLY like mine did. Louder under the engine, louder on one side. Get several opinions before opening it without a positive diagnosis. Unless you fancy spending money.

Porsche964FP

Thanks Jetta - I need all the support atm. It's the calm before the potential storm.

Thanks Andy. The car is with GTOne for a diagnosis, so it's out of hands for the moment.


Well during the drive down to GTOne it didn't get any better - hot or cold the noise seems the same. It's a hard to get a second opinion - driving the car if indeed it is the bottom end would only cause more damage, no?

Thanks Alex, don't know what I'd do without you!

Thank you for kind words of sympathy. As said, It was purely speculative based on experience. They will give me a firm answer when they have had a chance to diagnose properly by process of elimination - see previous post.

parsecnc4

+1 on the crap shoot.

I have a couple of 964's and one made similar noises at one point and it ended up needing a valve adjustment and fresh tuneup. From the video/audio clip, I was not able to make out any misfiring noted by your mechanic.

Goughary

for what it's worth - I just went through similar - and I rebuilt -I wont see the money again for sure. BUt all rebuilt, all money in, my car cost less than a new audi A4. I say rebuild. Your car, with a 'new' motor, is a perfect car and will be basically new. Where in the world could you buy a new car, like that, for the same money? You can't.

freedman

Frank,

Gutted for you, car was close to perfection at Spa, and looked and went fantastically well

Here's hoping for some good news once they've had a proper look

ja78911sc

Misfire:

My good friend had a spark plug fall out of the cylinder head on his 89 3.6 at the track. Now that I think of it his car made a similar noise.

His shop used a heli-coil because the threads were shot on the head. That would explain the misfire and noise.

Again, a lot of speculation until they get a good look at it.