Third Gear Issue

[MM92]

Hi,

In the last week 3rd gear has become a bit of pig to get into.

1,2,4, 5 & R all smoothly go into gear but for some reason 3rd doesn't like going in from 2nd.

I have to go back to 2nd and try again, then it works.

There's no sound changes or changes in driving, just isn't as smooth to get into.

FYI it's a 1.6 Zetec 2001.

Any ideas?

Thanks.