?

[Pil]

Originally Posted by Opie

How many miles on the car? Any chance of carbon buildup causing valves to not seat?

About 35,000 miles.

I have oil catch can that should mitigate carbon buildup.

[Opie]

Originally Posted by Pil

About 35,000 miles.

I have oil catch can that should mitigate carbon buildup.

What is strange is that so many of the valves are leaking, of the actual valve spring failures I've seen there is usually only 1 broken, only once have I seen 2 in the same engine...never seen more than that...

[Pil]

Originally Posted by Opie

What is strange is that so many of the valves are leaking, of the actual valve spring failures I've seen there is usually only 1 broken, only once have I seen 2 in the same engine...never seen more than that...

Do you have any insight as to why this may be?

Up till the misfiring at the traffic jam, the car was behaving normally and before that it had a track day 2 weeks prior with no incidents.

[Opie]

Originally Posted by Pil

Do you have any insight as to why this may be?

Up till the misfiring at the traffic jam, the car was behaving normally and before that it had a track day 2 weeks prior with no incidents.

That's why I was asking about carbon build up on the valves, other possibilities are bent valves (ever get any water in the engine?) or burnt valves (is it tuned or running E85?, Money shift on track?)

[humfrz]

Originally Posted by Opie

How many miles on the car? Any chance of carbon buildup causing valves to not seat?

Now THAT sounds like a diagnosis out of the 50s -

Maybe an Italian tune up is in order?

OK,OK, I'll go away -

[humfrz]

Have they performed a compression test - or did I miss something?

[Lantanafrs2]

Originally Posted by humfrz

Have they performed a compression test - or did I miss something?

Watch the video. They're filming the actual leakdown

[Opie]

Originally Posted by humfrz

Now THAT sounds like a diagnosis out of the 50s -

Maybe an Italian tune up is in order?

OK,OK, I'll go away -

It's an interesting side effect of direct injection...however since these cars are also port injected, not normally a problem.

[mrg666]

Originally Posted by Pil

Cylinder 4 started misfiring not too long ago while sitting in traffic jam.

Brought it in to a workshop to have it checked out and they have since changed the spark plugs, coil packs, engine wiring harness and it's still misfiring.

I've check my VIN with the recall range and it's not part of it.

They are reluctant to completely open up the engine but sent me this footage *suspecting* it's the valve springs.

Car is tracked regularly with no power enhancing engine mods

footage #2

That is exactly how my car's symptoms started with single cylinder misfiring and associated CEL. Service started checking with spark plugs, coil packs, and injectors. Then, they said they have to take the engine apart and they found valve springs were bad. It is very expensive if it is out of warranty. I paid $4.5K

BTW I heard the ping at the moment valve spring failed when I was cold starting the car - very subtle sound, can be easily missed.

[humfrz]

Originally Posted by mrg666

That is exactly how my car's symptoms started with single cylinder misfiring and associated CEL. Service started checking with spark plugs, coil packs, and injectors. Then, they said they have to take the engine apart and they found valve springs were bad. It is very expensive if it is out of warranty. I paid $4.5K

BTW I heard the ping at the moment valve spring failed when I was cold starting the car - very subtle sound, can be easily missed.

Good to know. So, if hear a ping on startup, I'll let my 2013 coast down the hill to the dealership and trade it in for a green one -

[humfrz]

Originally Posted by Lantanafrs2

Watch the video. They're filming the actual leakdown

Oh, so that's what was going on -

So, I reckon I'll retire my compression gauge, along with my dwell meter and timing light - kinda

[mrg666]

Originally Posted by humfrz

Good to know. So, if hear a ping on startup, I'll let my 2013 coast down the hill to the dealership and trade it in for a green one -

Well, if you are not joking, I wouldn't wait for that ping - those green ones will not be around too long and you can have a higher trade in value. Do it!

I cannot do that since I did too much wrenching on this one and I'm kind of attached to it now. I will keep it forever, renewing, replacing parts continuously.