quicksilvr
New member
Here's the skinny:
-Within the last 3 months, my idle has gotten just the slightest bit of roughness to it at startup. It used to idle so smooth that you couldn't tell the truck was running. Now, if I put my hand on the steering wheel, I can feel a lopey roughness (almost like it's a v8) in the idle. Again..this is a very slight roughness to the idle...RPM doesn't vary, and you can't hear it. The roughness stays there even after the engine is warm. Occasionally (maybe 10% of the time) I notice that it is NOT doing it....but for the most part, I just feel like the idle has gotten rougher overall.
-When I took my trip to Colorado last week, my overflow tank went from overly full to almost empty (still some in the bottom). That was the first time I'd EVER seen coolant dissappear from the truck. Since refilling the overflow tank, it has not gone down at all. Zero. (on the trip, I pushed the engine pretty hard going up some mountain passes, and my SGII was reading 215 coolant temp for a while). The cap on the overflow bottle was loose after the trip.....
-My exhaust has a slightly sweet coolant smell to it. No smoke, ever. Just a smell.
-Last oil change, my UOA came back great. No coolant in oil. I'm changing the oil tomorrow, and will have to wait to see what that UOA says. However, the oil looks perfect right now, and I don't expect to see any coolant in the UOA.
-Coolant looks perfect. Coolant is Prestone's new "mix with any" coolant. No silicates or phosphates.
What to do? Any diagnosis help? Am I imagining this...or I am starting to get a failing headgasket?
-Within the last 3 months, my idle has gotten just the slightest bit of roughness to it at startup. It used to idle so smooth that you couldn't tell the truck was running. Now, if I put my hand on the steering wheel, I can feel a lopey roughness (almost like it's a v8) in the idle. Again..this is a very slight roughness to the idle...RPM doesn't vary, and you can't hear it. The roughness stays there even after the engine is warm. Occasionally (maybe 10% of the time) I notice that it is NOT doing it....but for the most part, I just feel like the idle has gotten rougher overall.
-When I took my trip to Colorado last week, my overflow tank went from overly full to almost empty (still some in the bottom). That was the first time I'd EVER seen coolant dissappear from the truck. Since refilling the overflow tank, it has not gone down at all. Zero. (on the trip, I pushed the engine pretty hard going up some mountain passes, and my SGII was reading 215 coolant temp for a while). The cap on the overflow bottle was loose after the trip.....
-My exhaust has a slightly sweet coolant smell to it. No smoke, ever. Just a smell.
-Last oil change, my UOA came back great. No coolant in oil. I'm changing the oil tomorrow, and will have to wait to see what that UOA says. However, the oil looks perfect right now, and I don't expect to see any coolant in the UOA.
-Coolant looks perfect. Coolant is Prestone's new "mix with any" coolant. No silicates or phosphates.
What to do? Any diagnosis help? Am I imagining this...or I am starting to get a failing headgasket?
