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1990 240 ECT replacement - OEM and Teflon tape 200

Just replaced my Engine Coolant Temperature Sensor (long overdue) with after market from IPD and also put on new connector and spliced into wires, removing old suspected bad splice. I immediately had cold start problems and codes 123 and 224 and the check engine light coming on.

Will now order OEM ECT as saw other threads which may be the reason. Too bad you can't order these with a new connector and some lead wires from IPD for the 240.

Question - good or bad to use teflon tape on the ECT threads, which I did on the OEM threads? Same question for teflon tape on the Coolant Temperature Guage sensor?

Any other suggestions or thoughts are always welcome.

thx. Mark






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