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Engines require, more fuel when they are cold.I get a low idle (500-700 RPM) and stalling on cold start unless I give it constant gas. As a result, the (ECU) uses this data, to adjust, the fuel injection and ignition timing. Because, its readings, play a key role in calculations, which affect engine performance. Solution:The engine coolant temperature (ECT) sensor, is one of the most important, engine management sensors. more of a rough idle in general (you notice more vibrations in the steering wheel at a red light) But no code, no stalling, and no severe ride issues. Usually a problem with the (ECT) sensor will show a few failure symptoms: Poor Fuel Economy Black Smoke From Exhaust Engine Overheating Illuminated Check Engine Light Poor Engine Performance Or Stalling Increased Emissions Poor Fuel Economy One of the first symptoms, associated with a problem with the (ECT) sensor is poor fuel economy.Symptoms: mpg dropped from 23.6 to 20.9 (this car does about 80% city driving) more of a rough idle at start-up with more noise than usual. Most people seem to think it's the actual cold start injector that failed, but 98% of the time it's this switch that has failed. cold start thermo-time switch (cold start injector switch) If your trucks cranks excessively (more than a few seconds) when it is cold, and you don't get "fast idle", check this switch. on the 3.0 it's mounted on the little water block on the back of the motor near the. There's also the cold-start timer switch. A fuel delivery pipe bolts to it with a banjo bolt, and there's a black plug that plugs into the top of it.

Well, the cold-start injector is mounted on the passenger side of the plenum. Many cars have more than one coolant temperature sensor.409 Posts. The tip of the ECT sensor protrudes into one of the cooling system passages and is immersed in coolant. You will face problems while changing gears 7.3 crank no start flow chartA typical engine cooling temperature sensor is a Negative Temperature Coefficient (NTC) thermistor, which means its electrical resistance decreases when the temperature increases. Check engine light or other lights such as ABS and traction control 2.

S schiker Well-Known Member Messages 3,006You have to get a hold on to the symptoms. Then look at rail pressure : must be over 4K PSI before ECM will fire the injectors. Disconnect the fan at the lower radiator and see if it fires off. Also if the fan shorts out it won't start. Look at batteries, grounds, and the starter for cranking RPM being low. Upon measuring the coolant temperature, the sensor passes on a signal to the car’s. Monitoring of the engine coolant is necessary as the engine’s fuel requirements are higher when it is cold, and lower when the engine is warm. The coolant temperature sensor is responsible for monitoring the temperature of the coolant in your car engine. The sensor connections changed between these years and I had noticed butt connectors used on them to connect a generic connector. My engine was transplanted from a '93 3VZE into my '88 by a previous owner.

The cold start injector also tested working when fired manually, however would not run when the starter was engaged.

There are several symptoms of a bad MAF sensor, and not all of them are immediately obvious: Illuminated Check Engine Light: Performance and circuit diagnostic trouble codes may refer directly to the MAF sensor, but fuel trim and misfire codes can also be linked to the MAF sensor.

7 Symptoms of a Bad Mass Air Flow Sensor.

If you own one of these vehicles, skip the above checks and start by testing fuel pressure. Most common cause of hard start when cold. EVAP purge valve is leaking when the canister is full. Symptoms Of Bad Engine Coolant Temperature Sensor. Reasons That Can Cause Hard Starts When Warm. It is the most common reason for both problems. If your trucks cranks excessively (more than a few seconds) when it is cold, and you don’t get “fast idle”, check this switch. A faulty ECT sensor can send a false signal to the onboard computer, resulting in an incorrect air-fuel. One of the first signs of all coolant temperature sensor symptoms you will probably notice is that.

8 Bad Engine Coolant Temperature Sensor symptoms Check Engine Light.

(Say 3600 ohms in Canada and 3000 ohms in southern California ) When the motor warms up, the CHT resistance drops to around 270-300 ohms. The CHT sensor has a resistance of around 3-3.6K ohms "cold". However, once the motor warms up the sensor will still be indicating "cold" and it will run too rich - but might get you home.