Stock about 130hp @ rear wheel

yes....

It sure sounds like thermostat to me. Did something get caught in the thermostat when you were installing it so that it won't close? That's a puzzle for me if the engine won't really get warm. Make sure your mechanical linkage between the dash "hot/cold" slide lever and heater valve is working properly. Also, you might have a clog in your heater core loop.

May be your alternator.

mechanical compensation for idle air flow to match a predesignated parmeter

You will need more than the AC Compressor for this. The refrigerant is different. You will need all the components to go with the newer version Compressor.

1991

it right under the dist. cap .... it has a wire harness with 2 wires coming out of it

Try this...there'e a small lot to the right of your transmission. Stick your ignition key all the way in and it will unlock the steering wheel. I'm not sure if this is what you were looking for but best of luck! Bob

?timing marks for 2.0 prelude 89

Fuel tank.

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1-3-4-2

IT has been done before but you will to do some modification i know this much.

Poor compression rings on the pistons will allow gasoline to seep into the oil sump.

Engine overheating, loss of coolant with no apparent leak, overfull oil level, oil looks like chocolate milk, a grey foamy substance on the underside of the oil fill cap, white smoke from the exhaust especially at startup, possible engine miss, loss of power, & air bubble escaping from the radiator with cap off.

If you will look in the trunk area, I think you will find an access plate for the fuel pump. If not, the tank will have to be removed. On my '90 CRX Si it was necessary to drop the tank. Jack up the back end and support with stands. There was a dust shield on the drivers side of the tank that is held with a couple of bolts and a couple of plastic keepers. Some models have an external pump in this location, but not the CRX. Remove this dust shild. Drain the tank by removing the threaded bolt in the tank catching the gas in a pan, hope your tank isn't full. There are two straps under the tank that attach to two threaded rods that hang from the cross member behind the tank. Remove the nuts and lower the empty tank onto a support to keep the pressure off the fuel lines, I used a brick. There are 5 or 6 nuts that hold the fuel pump assembly onto the top of the tank. Check to make sure that the pump has power before you replace it. My pump was OK but I had a circuit break in a corroded connection at a coupler that I was able to trace back to and access in the middle of the car where the fuel gauge sensor goes into the top of the tank. BTW, it was very difficult to hear the fuel pump motor running once the power was reconnected. I had to disconnect the out going fuel line to convince myself that the pump worked. The project was slow for the first time but went better than I thought it might in a 16 year old car.

No. The Civic seat rails are different.

Not sure if it is the same as a 1990 crx but the fuel pump is in the gas tank. You will have to drop it and it is on the top side. As for relay a good way to test it is turn the key until all the different lights come on in the dash.

Let it stay on and see if the engine lights goes off or stays on. If goes off the relay is good if not then you need to replace. I had this problem w/my 90 rex and that is how I determined it was the relay switch. Have not had a problem since. That was over 3 yrs ago.

parking, or emergency brake

You have to know three things, the transmission type, the transfer case type, The rear axle gear ratio. Also in some cases, the underdrive. Enter the information in the site linked below and you will get your answers.

The speed sensor is what sends signals to the speedometer to display how fast a car is traveling. To find it on a 1990 Honda Crx Si it will be mounted on top of the transmission housing.

The ECU on 1988-1991 Honda CRX cars is located under the carpet at the passenger's feet. Four bolts hold a metal panel covering the ECU.