Let's take this in steps.
First of all, you MUST relax pedal pressure during the upshift. Pedal pressure translates to chain tension (how it drives the bike) and that means the chain wants to pull down to the smaller sprocket. TYhere are techn ical aids to help lift the chain, but even with these, upshifts need lower tension to happen smoothly.
Now, test whether the problem is in the derailleur or related to cable tension. This needs a friend to hold up the rear wheel while you pedal with a hand. Shift by pulling the bare wire away from the frame like a bow string. If it shifts cleanly and crisply, the FD is fine, and you probably need to adjust the cable a bit. If it doesn't shift well this way, you must have dislodged the FD.
Adjusting a FD involves a number of steps and my fingers are unwilling to go that far, so if it's not the cable, find a tutorial "how to adjust front derailleur" and follow it from the beginning as if you were first installing one.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
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Last edited by FBinNY; 07-22-14 at 10:59 AM.