Head gasket issue? Other possibilities?

[Rangeroad]

Hello,

Thinking I have the dreaded head gasket issue. My main symptom is white smoke for approx 2 mins after starting and 'sweet' smell. However:

-oil cap and dipstick show fine.
-no loss of coolant; plastic resevoir hasn't changed
-when cap is off rad, coolant flows over after engine is warm, but does not bubble
-no change in thermostat gauge

Compression test from 6 months ago was:

Cylinder 1 2 3 4

DRY 165 120 165 165
WET 195 165 210 190

Aside from the carbon testing in coolant, is there anything else I can check?

Any insight appreciated. Thanks!!

 

[krmccour]

Try a leak down test, that could help you pinpoint where you are losing compression on #2. You still have good compression, so it could be a very small leak that you wouldn't see right away on the dipstick or in the coolant reservoir. Good luck

 

[PitbullRescuer]

I'm guessing you either have bad valve seals or bad piston rings on #2. That's quite aways off from your other cylinders.