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Old 07-04-2018, 10:25 PM   #11
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Put an Ohm meter on the CHT sensor. Start the car and see if the resistance through the CHT sensor changes. Easiest way to see if the CHT sensor has failed.
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Old 07-05-2018, 01:15 PM   #12
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The other code, P0128, is for engine not reaching operating temperature. Often it means a stuck-open thermostat, but not always. If the CHT is getting wonky info, then you'd get that code regardless of what the real temperature is.

You can pick up a pyrometer for about $20 that you just point at the engine to see what the real temperature is, and compare that to what range the sensor is reporting. I find it a handy little tool for anything heat-related, though originally I bought it for checking temps across the treads on my race tires.
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Old 09-02-2019, 10:21 AM   #13
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My apologies for reviving an old thread, but it seems i have similiar issues. I also had a similiar code P1289, with the characteristic self-acceleration. It was also a handful to start and when it finally does start, its with lots of black/ blue smoke and extremely high rpms. I have since changed the CHT out for one made by Standard- which worked for a few days before the ominous P1289 popped up again. I then changed that out for two (used) sensors; with no sucess. Is there some other component i should focus on? How would I know its my wiring? Thanks so much!
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