![]() Take a flashlight, and aim it inside that hole. Turn off your garage light (or do this at night) Adjust your idle screw on the throttle body so that you idle at 700 RPM (or as close as possible.) (or you can use your V-AFC for that, if you have one). if its a nice timing light, it will display your idle speed. the timing light clamp just needs to go over that wire. (the firing order goes, from passenger side to driver side, 2-1-3-4). Take your timing light, hook it up per the instructions that came with the light (power from the battery, ground to the chassis) the #1 plug wire is the wire that goes to the 2nd spark plug from the passenger side. yank that thing out of the block, there will be a hole there (don't stick your weewee in there, you'll fawking loose it) you will see it under the upper radiator hose, next to the header heat shield. ![]() pull the small rubber stopper out of the front of the block. turn off all lights, AC, fan, defroster, & stereo equipment in the car turn the ignition on, but don't start the car take the one with the brown & white wire going into it, and stick a paperclip into the plug to jump the harness (complete the circuit) look under the dash on the driver side, behind the center console. say 'damnit', get back in the car, and drive to the store and buy a timing light, with a digital readout for RPM. drive around until you are almost out of gas Here is how to set your timing (this applies to a 4th generation prelude H22 - would guess the 5th gen is the same, or close.): I wouldn't go anything past 19-20 degrees though. USDM motors have less of a chance of doing that, as the compression is lower. your biggest concern from advancing the ignition will be detonation. I have a stock JDM motor with intake & V-AFC. I cranked it up to where its supposed to go, and went back to the track - ran a 14.7 I went home, checked the timing, and it was about 8 degrees retarded. I went to the track, and my BEST time was a 15.8. I had been without my car for a month, and driving a focus, so it seemed quick. I drove the car around for a while, and it felt ok I guess. When I got my new motor, the shop forgot to check the timing. Ignition timing can KILL performance, or KILL your motor.
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