Just rebuilt my 92 geo metro. Did not mark the ditributor before pulling it. Everything is electronic on the distributor and I am supposed jumper a plug but can't find a pic and don't want to short anything before putting a timing light on it! Set it by ear but I can tell it is a little off! Can anybody can send me a pic of a jumper lead installed?
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Get a strobe timing light, hook the aligator clamps to the battery and the C clamp to the #1 spark plug wire. This makes the lamp flash every time #1 plug fires. Point it at the main pully and you should see it flash and light up a mark on the pully. If you see no mark, stop the engine and look for it. Paint it white with some correction fluid, then try again. You will also need to loosen your distributor, which has two bolts holding it tight. You can tell which bolts as they have elongated holes to allow you to adjust timing. Once you see the white timing marks, (with engine warmed up) rotate the loosened distributor until the mark lines up with the 5 or 6 on the plastic timing belt cover near the pulley. This would put your timing 5 or 6 degrees advanced. I think factory is 5.5, so this should be close.
for 1991 geo metro 1.0 liter 3 cyl engine the timing is 6 degrees before top dead center. you will need a tachometer because the rpm must be 800 when you set the timing. also you will need to disconnect the vacuum advance to the distributor, and plug the hose to avoid a vacuum leak. (alternate method is to pinch the vacuum advance hose going to the distributor while you are setting the timing) Good Luck!