C6DL

Today I went for a ride with my vette.
Sudenly during acceleration the car's became to shake a LOT.
When running idle, when throttle,.. the car is shaking like crazy!


The engine ligt warning is blinking also.

It looks like there is something wrong with the engine..
It felt like a wheel thats comes loose.
But nothing strange visible from the outside.

I was 20 miles from my home..
but I succeeded to drive to my house at low speed.


I think that something is wrong with a coil, or sprak plug ?
What do u guys think?

extrapilot

Yes, check your spark plugs wires as they are know to come loose.
The other item that comes to mind is a broken valve spring, that does happen with the LS series engines, but should be able to replace without issues in most cases.

C6DL

Thnx!
I need to remove the cover and check the spark plug wires reaght?
Strange thing btw, is that the spark plugs are replaced 30 days ago by the garage!

Last question..
Can the engine be damaged because I
drove 30 miles with this?

z06Don

Wont hurt the engine....check both ends of the plug wires...I have had wires come loose from the coil end and the spark plug end.

extrapilot

No engine damage but your exhaust catalysis may not be to happy. Extra fuel from a spark plug not firing could create extra high temps at the cats and can burn the substrates up. If that happens, the exhaust can not be converted to clean emissions. But if you get no OBD error codes after fixing the misfiring issue, if that's what it turns out to be, you should be good to go.

Landru

^ Right there's a clue, my friend.
One or more plug boots were not seated properly.
Easy to do.

Have boots checked & reseated, issue will be solved.
G/L & please update.

C6DL

Thanks people!!
indeed the coil end come loose!

Is there a way to prevent this issiue in the future???

Landru

IF coils & boots are installed correctly, boots 'burped' (look it up) they'll stay put.
Supposed to be a certain feel attaching plug boots, like a snap/pop when adequately seated & burping allegedly releases any air trapped in boot.

Once properly installed, usually they're there to stay until deliberately removed.
Hellova thing to happen though, worse if/when it happened early in C6 run.
Few lucky owners had to go down many rabbit holes trying to connect symptom to cause. God Bless 'em.

C6DL

My english is not THAT good..
But the part I DO understand is you say that if they are attached properly they will SAY attached?

And last question,
I also read something about a broken valve spring.
How to prevent this form occuring? .. (don't have this problem yet)
but I'm scared for the storys that this can damage your engine a lot !
So it's better to prevent this .. how to prevent?

Tnx!

extrapilot

Not preventable, as they are hit or miss, and much less likely to happen in normal operation. Just drive and enjoy your car...

Landru

Not 'say', stay.
As in stay-put, should not come loose.

Let's start w/ which engine do you own you're concerned about?
LS2? LS3? LS7? LS9?
Sorry if it's there, missed it.

Any engine can have a catastrophic failure, would say failures w/ LS2/3 are really quite rare. Same could be said of LS9.
Now LS7 has experienced some failures on some engines, but know there're several LS7 owner-members w/ >100K w/ no problems.
Prematurely worn valve guides are suspected cause, rebuilding heads has all but eliminated issue.

IF a LS7 (Z06/CE) there're couple options for protecting 'investment'.
1) Aftermarket warranty such as GMEPP, only one I would recommend.
Although GMPP is probably as good. YMMV
*Providing car qualifies, 10 yrs old or less and <120K and availability.
2) Have heads rebuilt by a reputable shop familiar w/ LS series.

IF not a LS7 my only advise is relax, enjoy your beautiful Corvette. Overall, LS1/2/3/9 are fairly bullet proof drivetrain-wise.
They're not w/o issues, harmonic balancers comes to mind, PITA.
Plus lately more & more problems associated w/ bad starters/solenoids and/or burned connections interrupting power are being reported.
Guessing an aging C6 w/ excessive heat due to local climate and/or headers?

BTW your English 'reads' fine to me.
Curious, where do you live?
Only ask because where one's located (country) may have an adverse affect accessing a decent shop, routine maintenance & of course parts.

C6DL

Thanks for this great reply!
I'm from Rotterdam (Netherlands) ..
And I drive a 2006 C6 LS2 https://s3.postimg.org/jsiwhql77/DSC01550-2.jpg

Landru

An '06 LS2?
You're golden, assuming engine's been left stock.
Nice looking hood, ideally it's only cosmetic, not hiding a SC or such.
Nothing wrong w/ a SC providing there's access to qualified techs if needed. In the Netherlands, that might not be impossible but certainly challenging.

Routine oil changes using a synthetic, Mobile1's recommended. Can't emphasize that enough.

Familiarize yourself w/ local shops capable of performing LS series work when required, stuff like starters/solenoids etc. It's a Chevrolet, has to be competent shops w/ good mechanics available who know Chevys.

Right now just have a good time, enjoy.
'06 has a good track record, very reliable.