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Coolant temperature sensor. I'm assuming this is an EFI car. The CTS tells the ECU to run rich during the startup , since it will take a lot of fuel to make the engine run when cold , most of the fuel goes out the exhaust and gets burned in the cat. However , after the engine warms up , the CTS is supposed to tell the ecu the coolants temp so that it can back off on the richness and the car will continue to run as normal. However , if it does not , the car will now be running VERY rich while its warm , which in a lot of cases will make it die out. Now , I may be way off base here , but I've seen it happen to a couple of Buicks , so I'm basing it on that.
Now , there may be more than one CTS , one is generally reference for the ECU and one is for the guage and in some cars the electric fans. CTS's are fairly cheap , between $15 and $40.
Other than that , I'm pretty unfamiliar with the earlier Zs , but most cars use the same types of sensors , so I'm guessing it's a sensor and not any kind of component failure. I'm about to eat my words right here , it might possibly be the idle air control valve. Might. A simple test would be to crank up your idle a few notches and see if that still happens.
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1992 Yamaha FZR 1000. 145 Hp, all stock..
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