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The Final Resolution Well, finally after weeks of limping along using my LS only on short local trips where it ran great for awhile and then overheated by varying degrees, along with rough running, missing, etc., etc, etc., we decided to begin changing out the most likely/least expensive...

Thanks Joe. I'll keep you posted.

I'll talk to him this afternoon. Would a cooling system pressure test show the cooling system leak(s). He tested the cooling system for carbons (it came up negative), but I don't know if he pressure tested the cooling system.

Could this be why my mechanic said that he noticed white smoke coming out of the car one day when he was running it at the shop trying to get it to fail? He was thinking some kind of head gasket issue, but it only happend that one time, never again. I've been driving it almost every day (just...

My mechanic changed coil #1 (under warranty as it had been changed only a few months ago). Car will run fantastically for days, then it will suddenly overheat (it has never run above the halfway mark on the temp guage) at first only slightly, then all the way up to the 3/4 mark on the temp...

My mechanic just reminded me that he changed the PVC connection hoses late last year (2011). He has a scope so he's going to check PCM / soleniod wiring. He says he still thinks that maybe there's a head gasket issue of some kind though. They've been running it around town today to warm it...

Thanks Joe. I'll pass this along to my mechanic when I talk with him this afternoon. If you think of anything else to check, I would appreciate any additional thoughts. I'll also pass along any new information from him.

I have a 2000 LS V6, with 105k mi., with a variety of perplexing issues. It misfires occasionally on cyl #1, always when warmed up, never cold. It runs very rough during the misfire, but then eventually levels out and runs just fine. The check engine light does not come on but it is working...