Whats the sensor that is under the distributor on a 1991 honda civic ex?.my car doesnt start without that. also from 1st to 2nd gear my car feels like it slips out of gear and shakes or something..does that have something to do with changing the engine or trans mounts?

couple of things to try first , is the trans fluid at correct level ? when was the fluid last replaced ? have the OBD codes read as may tell you what the problem is , if you done all this i'd go to a repar shop for advice

Thats a common issue with 90-92 Hondas best bet is the TCM (Transmission Control Module) its under the passenger side floorbord carpet (takes a 10mm deep well to remove the bracket) it should have a blue sticker that says transmission on it. The other possibalty is the solinoids there are 4. Hooking them up to 12volts tests them if it clicks then they are working if not they need replaced.
I hope this helps you and best of luck!

i had the same thing...It's the transmission. It's REALLY noticeable shifting from 1st to 2nd gear. I was able to get my transmission fixed for 900 bux. That wasn't even a replacement so i can imagine how much it would cost to get it replaced. The shifting will get worse. By the end of my "experience" it wouldn't shift from 1st to 2nd for about 5 minutes until i drove it around for a bit. THen it would "warm up" to the idea of shifting to 2nd gear.

Change out the transmission lube use a full synthetic fluid that is less prone to cause this type of cold related shift issues.

Before any fixing is started see if the car has a trouble codes and pull them. The connector is blue and located in the lower right hand side of the passenger side of the car. You have to remove the plastic and use a jumper wire or a paper clip to jump the terminal. watch the blinks for the code numbers. If it is one long blink then that counts as ten, then how many others blinks. like, 10 + 5 =15. Hope this worls for you.

had the same problem w/ my 1995 honda civic lx. there is no speedometer cable in this vehicle. there is a speed controll sensor, if ur facing the front of the vehicle it is located on the left side just beyond the distributor cap/ below . its held by two screws. price range was about 75 to 125 ? i got my off a friends honda that no longer was running. bam! fixed

have you check the spark plug?

J1/S1 Found in: Integra XSI/RSI (DA6) Type: Cable 1st: 3.230 2nd: 2.105 3rd: 1.458 4th: 1.107 5th: 0.848 R: 3.000 FD: 4.400 Y1 Found in: CRX/Civic (optional LSD) Type: Cable 1st: 3.166 2nd: 2.052 3rd: 1.416 4th: 1.103 5th: 0.870 R: 3.000 FD: 4.266 YS1 Found in: Integra 92-93 XSI/RSI (DA6, DA9) Type: Cable 1st: 3.307 2nd: 2.105 3rd: 1.458 4th: 1.107 5th: 0.880 R: 3.000 FD: 4.400 S80 Found in: Integra Type R 98+ (LSD) Type: Hydraulic 1st: 3.230 2nd: 2.105 3rd: 1.458 4th: 1.034 5th: 0.787 R: 3.000 FD: 4.785 S80/Y80 Found in: JDM SiR-G (optional LSD) Type: Hydraulic 1st: 3.230 2nd: 1.900 3rd: 1.360 4th: 1.034 5th: 0.787 R: 3.000 FD: 4.400 Y21/Y80/S80/S4C Found in: JDM 96-97 Integra R(LSD) JDM Civic R [EK9](LSD) JDM Civic SiR [EK4, EG6] JDM CR-X DEL SOL SIR (EG2)(optional LSD) USDM DEL SOL VTEC (EG2)(OPTIONAL LSD) Type: Hydraulic 1st: 3.230 2nd: 2.105 3rd: 1.458 4th: 1.107 5th: 0.848 R: 3.000 FD: 4.400

bearings in the trans. sounds like rebuild time

It's hard to understand when you say it feels like a manual shift. Noise? Feel? I do know that the 87 auto trans does have a weak 1st to 2nd shift drum (as explained to me by my mechanic) that makes a grinding, elongated shift under heavy acceleration when it starts to wear. Under normal acceleration, 1st to 2nd shifts were normal (crisp, immediate). Since that day 8 years ago, I've avoided starting off to quickly, and so far have saved myself a tranny overhaul.