My check engine light came on so I took it in to have it checked. They tell me my fuel temperature sensor is bad. Cant find out where it is on my van & no matter where I research it I find it keeps telling me I dont have one. Could they be talking about another sensor?
My girlfriend is having the same problem with her Mitsubishi Galant. The code should go away after they scan it, but before they scan it try tightening your gas cap a few more turns. It seemed to work for her, it might also be your oxygen sensor(O2 sensor). It should be located on your exhaust manifold(headers). Hope this helps.
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When a temp sensor goes bad, it usually fails to a setting that makes the ECM think the coolant temperature is about -40 degrees F. This makes the ECM send MASSIVE amounts of fuel to the injector(s) in what it thinks is an extremely cold start. This causes the engine to flood and makes for a hard start. You may be able to get the car started if you do a "Clear Flood" procedure, which is to hold the gas pedal to the floor while cranking until the car starts. Even then, though, the car will run so rich that you may have to keep revving the engine to keep it from stalling out at idle. On the road, it may seem better, but your fuel mileage will be awful.
I'm not a 100% but it sounds like your camshaft position sensor went bad then caused the other codes to come up because the camshaft position sensor tells the computer how much gas it needs. So it started a chain reaction with the fuel level sensor, fuel temperature sensor, and knock sensor codes. The Fuel temp. sensor helps the engine to know how much fuel to inject as well depending on the temp. of the fuel. The fuel pressure sensor senses the amount of fuel in the fuel rail by reading the internal pressure of the rail, so that's what leads me to believe that it's your camshaft position sensor. Particularly if that was the first code that came up. Hope this helps you.
If it won't start while cold, it could be the cold start fuel injector is not working or clogged. Check also for a large vacuum leak which could be diluting the fuel mixture. Check for a bad MAP or MAF sensor.
If it won't start hot, look for leaking fuel injectors or an engine coolant temperature sensor disconnected, the wires to it broken, or a faulty sensor. If the engine coolant temp sensor is stuck at full cold (which it would be if disconnected), it will tell the computer the wrong engine temp and the computer will schedule too much fuel for a hot start leading to flooding.
This could be a lot of things, but the first thing I would check is the water temperature sensor that tells the fuel injection system how hot the water in the engine is. If the fuel injection thinks the car is cold, it supplies extra fuel and eventually the engine floods. This should set a check engine light and code, although the code in this situation will usually point to some other component that does not agree with the water temperature sensor rather than to the actual culprit.
The most likely cause is due to the radiator fan constantly running and the engine not getting to operating temperature, thats why your temp gauge isnt going up, check all related wiring to the cooling fan and make sure there no bare wires that could be causing a short to ground causing the fan to constantly run, secondly check the fan relay, if all of that checks out check the coolant temperature sensor because the information from that sensor tells the computer when to turn the fan on and off, if the sensor is bad it could be telling the computer the engine is hot when in fact its not.
The cold start temp sensor is same as ambient air sensor, tells the computer to give the engine a certain amount of fuel to start since there isn't a choke per se. There are two temp sensors, the air temp sensor and the water temperature sending unit usually near the thermostat. The cold start doesn't affect fuel economy unless it's telling the computer the engine is cold. The computer reads several sensors to meter the fuel, map sensor which works off intake manifold pressure (check rubber hose for cracks that connects it), throttle position sensor which is the main fuel control (test it with an ohm meter) and oxygen sensors. The main culprits for bad fuel mileage are usually a partially stopped up catalytic convertor and bad oxygen sensor(s). You can sometimes remove a O2 sensor and spray it with carb cleaner , lightly brush the carbon off with a wire brush to get it working again. This fuel with alcohol is rough on all vehicles. Hope some of this helps.
Could be the thermostat. I know nothing about cars but I noticed my 2000 Grand Prix temp gauge was not going to the normal level. My wife drives this car so I didn't notice it for a month or so. Eventually the Engine light came on. Took it to Autozone and the code came back as P0180... (1) low coolant (2) bad thermostat (3) enginge fuel temp sensor. They used a code reader that was about the size of an Ipod nano.
Coolant was okay, so took it to my mechanic. His netbook sized computer showed it was the Thermostat. He reset the codes and the temp guage went back to normal. Was short on $40 for the fix at the time, so I parked the car and promised to bring it back in 3 days. Went out and checked the car a day later at 25 degrees outside without starting the car... gauge still sitting at the normal level. No question it's the thermostat. That car will not be driven again until T.stat is fixed in 2 days.
Check the Coolant Temperature Sensor - might be defective (lies to the computer ECM). You see, the coolant temperature sensor tells the ECM (computer) what the engine temperature is... if it's defective (telling the computer that the temp is -40 deg, then the computer will raise the fuel mixture for that temp. If, for example, the sensor is telling the computer that the temp is 200 deg, then the computer will 'LEAN' the fuel mixture.. get my meaning?
Good chance it is temp sensor, but have the codes scanned and that will tell you for sure. Another sensor I have run across could be oxygen sensor, sometimes they will make the vehicle run bad and sometimes they dont but in either case is does affect fuel mileage. Dont think either way you need to avoid driving your car unless maybe temp sensor showed overheating problem. But dont wait too long to get code scanned.