2006 honda civic 5 speed manual trans engine surges when down shifting from 2nd to 1st

SOURCE: Trans abrupt shift up & down between 1st & 2nd

Honda requires a highly friction modified fluid,or additive.Drain the fluid and replace with genuine Honda fluid.This should calm down the shifts a little.Fluid level is checked with the engine OFF.Also on your year Honda,there is a cable that runs from the accellerator linkage under the hood,down to the transmission.This cable is responsible for shift timing,and shift FEEL,and it is adjustable for these purposes.At the transmission are 2....12 mm nuts jammed against each other with a steel bracket in between.Loosen the nuts,and then the cable can be adjusted.For a softer shift feel,loosen the nuts,and take the end of the cable,and move it TOWARD the little arm (down) sticking out from the trans.This effectively makes the cable SHORTER resulting in softer shifts.For harder and later shifts,move the cable the opposite way,effectively making the cable LONGER.Beware though.adjusting the cable TOO much towards the softer side can cause the trans to start slipping and actually burn up clutch packs inside the trans,so some common sense is needed when adjusting the cable.Good luck,and remember to rate this solution.

SOURCE: engine noise

Sounds like a problem with the power valve actuator in the intake manifold collector. I would check with a Nissan dealer first and inquire of any recalls or service bulletins. Might save ya time & money.

SOURCE: 98 Civic Auto Trans Slippage

you need to replace clutch pack for that gear can be ordered seperately from parts store or dealer if you want to save money call peach street auto recycling at 1800-365-2341 for a warrantied used one! also might be time for change trans filter and fluid filter could be slightly clogged but I lean towards clutch pack I replace these alot on Hondas

SOURCE: 1999 DODG 3500 AUTO TRANS SHIFTS TO 2ND WITH A LITTLE HELP

I have a 1999 Ram B 1500 Van, auto transmission, 5.9 L engine.
Same problem, trans hesitates in 2-3 upshift, sometimes 1-2
to 2-3 upshift. Posts trouble code P1756 - Transmission Govenor pressure too low at below 15 to 20 Psi. Transmission pump shot or valve body leak stops trans from reaching proper pressure to shift, which is minimum 15 Psi.
Either trans is leaking in valve body, valve is stuck, shift solenoid on valve body is sticking, or pump is shot.

SOURCE: 1995 Honda Civic 5 speed manual will not shift

It could be that your syncro for the reverse gear is gone. Which would have to be brought to a tranny shop not a do it your self type of job.