today i did a mpfi manifold swap on my 1991 dx. It turns over but will not start. I checked for spark im only getting a little spark. does anyone know what code 9 and 10 are.if you what this could be please let me know

 

Code 9 - No. 1 Cylinder Position Sensor

It's the third sensor in the dist., and it detects the position of the No. 1 Cylinder, as the base for the Sequential Injection. It can also be located on the camshaft of DOHC engines.

CYP sensor is mounted on the exhaust cam on the ZC.

If the dist. base bearing starts failing, it will heat the sensor(s) up, destroying the magnetism thus causing a code(s). It will lose 10% of it's strenght, each time it is heated up to 170 degrees plus.

In most cases, replacing the distributor is the only alternative. Especially if the bearing has failed.
Honda does don't stock the bearing by itself, but other after-market compaines are said to have one.

If you have problems starting the engine, or drivability after the install check your cam aligment. The seizing bearing might have caused it to jump a tooth/notch or two. From the extra drag due to the bearing failing.

Code 10 - Intake Air Temperature Sensor

When cold, it should read 2.5-4.5 volts. Also, check the ECT sensor for the same voltage, they should read close to the same. Use the above chart for the ECT for checking voltage, since the two sensor should read close to the same.

IAT Sensor Wires:


1 Red/Yellow
1 Green/White