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$1900 is more than it is worth. The temperature should run slightly under half so 3/4 indicates to me that a problem has occured. The trunk wire thing is real common on the early LS400's and since there are several wires, I have heard of (and experienced) all kinds of problems with that situation. Took me a long time to unwind all the old, black sticky tape but there it was, bigger than Dallas, two broken wires and one about to break. I added extra length and then left it kind of loose since my first repair tore after I forced it back into the channel. Hey, put your location on, it really helps with helping you. Denny

read about the trunk hinge wiring harness failures

The main item you can do with the new engines today it to clean the fuel injectors. You should add a cleaner yearly to a gas tank to do this. I have found that "Seafoam" works for me and others. You should also check your air filter. Keep it clean as it can mess up your fuel ratios if it get pluged up. I use a K&N filter with increased capacity and can clean it when it gets dirt. You plugs will last 100k miles. Aslo keep your tires up to pressure noted in your manual and should be noted on a door tag. Hope this Helps!