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Questions and Answers

Nissan Pickup Fuel Temperature Sensor

Q. Vince, Have read everything you have about high idle and poor gas mileage. I have a 1993 Nissan pickup 4 cylinder. It has 150,000 miles. For a couple of months it has run an idle at 1,500 sometimes going down but not always. Gas mileage has dropped from 22/23 to 14/15. I have changed fuel and air filters, plugs, plug wires, cap and rotor, O2 sensor and checked the fuel pressure regulator.

Nissan Pickup Fuel Temperature Sensor

The computer shows code 55, all okay.

Today while idling at 1,500 rpm, I unplugged the Fuel Temperature Sensor harness and it dropped immediately to 700 rpm. I drove a mile with it unplugged and it seem fine. 1. Should I just leave it unplugged? 2. Would this also cause the poor mileage?

Tampa, FL

A. The 1993 KA24E engine did not have a Fuel Temperature Sensor (FTS). Perhaps what you unplugged was the Engine Coolant Temperature Sensor (CTS)? On Nissan engines with a FTS, they were part of the Fuel Pressure Regulator so you had the replace the whole Fuel Pressure Regulator to replace the FTS.

If it is the CTS that you unplugged, I would just replace it. It only takes about 20 minutes and it's cheap.

Answer to number two, yes it would cause poor fuel economy.

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