Looking for a map sensor for my honda prelude si 2.0 1987.

Not a single person answered your question, they all told you an answer that didn't relate to your question. Anyways the relays for your fuel pump are under your dash behind the fuse box.

Sounds like you are having a thermostat problem. It sounds like it is sticking at times and you may also have a bad temp. sensor. At times, if the thermostat sticks in the closed position, the sensor in the outlet side of the t-stat housing will not read the proper engine temp..Next time it gives you problems, lift the hood and carefully check the temp. of both of the water hoses to the radiator. If the top hose feels hot and the lower hose is only warm, then the t-stat. is stuck in the closed position and needs to be replaced.

very similar can definetly bolt in there were some differences in the water temp sensor and the speedo sensor but it can work as a parts or swap engine

The speedometer sensor is located on the top of the transmission. It is held on by one bolt. Remove the bolt and gently pull and turn the speedometer sensor and the whole assembly will come out of your transmission.


Park your Honda Prelude on a level surface, activate the emergency brake and place blocks behind the back tires for safety. Disconnect the negative battery cable with a terminal puller.

Raise the vehicle on the side of the wheel speed sensor's location. Remove the wheel and tire assemblies.

Disconnect the sensor electrical connection from the wiring harness.

Take note of the connection location for the sensor retainers, grommets and clips. You will need to know this information for the installation process.

Start at the connector end of the sensor cable and remove grommets, clips and retainers in order to free the harness.

Unscrew the sensor mounting bolt and remove the sensor from the differential housing.

Install the new speed sensor by reversing the removal process. Loosely secure the sensor and sensor harness connection in place, taking precaution to keep the harness from twisting or bending. Once in place, torque the sensor mounting bolt to 16 foot pounds (22 Nm). Tighten any bracket bolts to 84 inch pounds (10 Nm).

Lower the vehicle safely and reconnect the negative battery cable. Refer to your owner's manual to perform an ABS system check to confirm that you installed the sensor properly.

sounds like the speed sensor

yes car may not start if gaske is blown ,low compression or coolant in cylinders. price 750.00?

Try the Main Relay - two relays in a small rectangular box beneath the dash, next to the steering colum, with 7 or 8-pin plug to disconnect. The two relays are used differently to start than when running - failure of one relay could lead to starting but not continued running. Look at http://www.tegger.com/hondafaq/startproblems.html#mainrelay

...search for the 'EFI Main Relay title (half way down the page).

your o2 sensor is not reading right change it out and it will be fine

Its probably your speed sensor mounted on the back side of your transmission on top of the final drive gear. Its the sensor/plug located just under the shift linkage. Make sure its bolted down tight and check for any loose connections.

Look at the rear top of the gearbox/clutch bellhousing, below and behind the distributor. Well hidden, two bolts to fix, with a plug on the top.