Okay so previous to what I think is the headgasket failing in my d16a6, the compression was at a steller 220 average across all cylinders. Then after driving to Walmart and driving home, I went to start the car and it fired right up, ran the car for 10 minutes to check the A/C, then shut it off.

5 minutes later I go to start the car and it almost wont start, then blows a huge cloud of white antifreeze vapor out the tailpipe. Either the headgasket went or a sleeve cracked somehow. I did a compression test to see what cylinder might be bad, and the numbers were, 240, 250, 200, 215.

We checked it twice and got the same numbers. How in the heck can a blown headgasket make the compression increase on some of the cylinders?