Ok I have worked on two crxs in the last couple of weeks and they both seem to share the same problem. The first is my 88 crx with an ls/vtec with a b18a ls block with the coolant temperature sensor located by the oil filter (green with two nipples). The sensor was hooked up but the pr3 ecu was still throwing code 6 (ECT sensor). That car im not worried about but i just installed my friends ls/vtec into his 88 crx hf and its throwing the same code. This block is a b18b which the ECT is located on the thermostat housing. I used a plug for it and spliced in the two wires (black to black and green to green/yellow) and this car is throwing the code again.... is it just my luck stumbling into 2 cars with the same sensors being bad? I would think it would be less of a coincidence if they were the same year block but the sensors on the two different year ls blocks are in different locations. Has anyone had this problem? would anything else cause the ecu to throw this code?