I am doing the swap for a 97 Geo Metro LSI. It had a 1.3L 8 valve. For it to work I had to go to a 98 doner car and swap the entire wiring harness, fuel tank, engine, and computer to make it work. I did not want to go back to ODB1 electronic controls. I wanted late model ODB2 with port injection. I am going to put a twin cam head on the 98 1.3L that comes with 16 valves but is only SOHC. I have gotten to the point of harness, fuel tank, and engine are in the 97 car now and running. I am getting 40 mpg. The things that I still need to change out are as follows. The exhaust from the cat back is only 1.0" diameter. The car flattens out as for horse power about 4,000 rpm. The one inch exhaust is to small and I will be going to at least 2.0" pipe and muffler all the way back to the tail pipe. For the GT head/motor to work all of the electronic controls from the 98 must be installed on the GT motor. Map, tps, temp sensors, air temp sensor evap controls will be easy. they will just be change to the 98 and bolt them in place. It is the cam sensor and the crank sensor that will take some engineering to get them in place. The crank sensor and crank sensor gear (which is part of the lower timing belt pulley) will require an oil pump and oil pan change to the 98 1.3L version. They will give you the hole and mounting point for the sensor. The lower crankshaft timing belt pulley should be just a replacement. As for the cam sensor which I haven't pulled out of the 98 1.3L SOHC 16 valve head yet. Will require some engineering and making of an adapter to get it to work right. The 98 head has a different housing the the GT engine. The GT engine is wanting a distributor in place. The 98 just has a cam sensor and internal gear. No distributor. As soon as I figure this out I will post the fix.
_________________ Fainya 97 Geo Metro LSI,1.3L-GT-DOHC-16v,4.10 5-speed,A/C,170,000,suspension lowered 1",4 wheel disk brakes,15"alloy wheels with 185/50-15 Toyo's,GT bucket seats,analog oil pressure gauge,cruise control, new paint job. 40 mpg at 65 mph. Good, fast, cheap. You only get two.
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