Intermitten hard shift 1-2, 2-3, flare shift into 4th

Im assuming it is a 4 speed transmission and if you are using the "tap shift" which is for performance situations and you wouldnt typically need 4th gear. What speeds are you trying to go into 4th? If you are going too slow it wont upshot because you rpms might drop too low. Will it not go into 4th at highway speeds?

P1768 Acura Ricks Free Auto Repair Advice

code 1740 refers to AT -4th clutch pressure switch===causes--wiring--range position switch---4th clutch pressure switch---ECM
code 1750 refers to AT-hydraulic system mechanical failure===causes--wiring --shift solenoids--ECM ---transmission mechanical fault.

Now, I'm not saying this is a fact, but my TH700R4 trans did that very thing, wouldn't come out of third. And with no 3rd it won't go to overdrive. I rebuilt the trans and found the overdrive drum was all scarred and caused the limp home thing to happen, third gear was as high as it would go. I suggest you have the trans checked out by a professional trans shop. As for it being a bear to start, that's a faulty temperature sensor. If it's not functioning, the computer doesn't know to put it into cold start mode, which increases the throttle speed and puts more fuel in the engine for starting when cold. Like a automatic choke system in earlier vehicles.

Pretty much all the time!

D3, D4, and D5 are all just *DRIVE* like on any automatic transmission, EXCEPT
that the number next to the D is the "highest gear the automatic transmission will go into".
The Acura just gives you a choice, in case you don't want to go into a higher gear (like if it's slippery traction or a steep hill, etc.)

1 means: Manual gear. FIRST GEAR ONLY.
2 means: Manual gear. SECOND GEAR ONLY.
D3 means: Use automatic transmission, but engine will never shift above 3rd gear.
D4 means: Use automatic transmission, but engine will never shift above 4th gear.
D5 means: Use automatic transmission, but engine will never shift above 5th gear.

Band adjustment is very sensitive on these units, I set both adjustments at one turn. This is a 4 speed trans that has been converted to a 5 speed by turning on the od unit ( 1-2 shift ) in first gear.the 2-3 shift is busy because the od band is coming off causing the od unit to transfer back to 1:1 and the intermediate band is coming on . I have found that if the overdrive band is to loose it will release to fast causing a flare on the 2-3 shift bot not really affecting the 4-5 (overdrive) shift. So break both band adjustments loose and tighten the adjustment screw down and back off 1 turn the tighten jam nuts. Also the fluid level should be checked with the transmission warm ( 100 f , not hot, not cold) and the fluid should stream out of the check tube. Transgo makes a really nice vb kit that i use that will help these symptoms.

i had this problem with a friends 05 dodge 3500. i dropped the pan off the transmission, changed the governor pressure soleniod, trans filter and adjusted front and rear bands. also increased transmission pressure. this solved the problem he was having. you will need to have pressure gauges and a few special wrenches to do this yourself. also there is a valve in the transmission lines that has to be drilled out. this work not recommened unless you know what you are doing.

Unfortunately any problem it could be will have the same fix. You will end up needing the trans replaced or rebuilt.

Check wire to transmission it sounds like a ground out when you hit a bump ,

sounds like a stuck valve. I'm still new to transmission stuff so I could be wrong. he could probably get a transmission rebuild book and maybe just do it himself. it would be the cheapest unless you knows someone