Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 2005 3.6 valve spring broke, what the heck? in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I was on my way home a couple of weeks ago and out of nowhere, car running perfectly, then like ...
I was on my way home a couple of weeks ago and out of nowhere, car running perfectly, then like a snap, it started misfiring so bad that I could barely make it home.
No sensor codes to be found, but all cylinders where reporting misfires.
After checking the control system and finding no issues, my mechanic started checking for mechanical issues.
Bingo.... no compression in #5. Nothing, nada. He pulled off the valve covers and it was immediatly obvious that the valve spring had broken on #5.
Anyone heard of valve spring failures on a 3.6? I've been in and out of this forum quite a bit over the last 3 years, and this issue is not ringing a bell with me. I've heard plenty about timing chains, transmission oil cooling fittings, rear axles, but never valve springs.
Is this an isolated fault, or a more widespread issue with the 3.6?