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2002 Mazda 626 2L 4 speed Winter Performance Issues.

Nightflyr *
Richard Kirshy

I may study up on it and try my hand.
That would be a good start.

However, wouldn’t the compression issue happen in the summer as well as the winter.
Depends… how extreme the difference in compression / wear between cylinders.
There are many times when a vacuum leak will occur on a cold engine but seal itself once warmed up.

How does the temp play a role in this.
When things are hot they tend to expand and when they get cold the tendency is to shrink.