We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. Replacing the sensor is not a difficult job, but you will need a few simple tools such as: The sensor as you know is located close to the thermostat housing on most models and the procedure is as follows: How much does it cost to replace a coolant temperature sensor? Measuring the volt drop across the sensor allows us observe the sensor work in real time. A lower resistance reading doesn’t of course mean the sensor isn’t faulty. Both of these systems are designed to change the idle when they are on; due to the air conditioning system demands on the engine. Confirmation of an engine vacuum leak can be a very loud hissing sound coming from the engine area. But for those that are interested, buckle up! Symptoms of a bad sensor vary, but a check engine light will be the common denominator. If the stalling started to occur shortly after your last fill-up, suspect bad gas. Here are some of the most common symptoms of a faulty mass airflow sensor; A sensor that has been contaminated by fuel, varnish or dirt will under report airflow. Some sensors may be a three wire set up, don’t let this throw you off. Idling issues can be very frustrating, but with some patient troubleshooting, you’ll have a real chance at figuring it out. A good scan tool has the ability to graph ECT performance and makes it easy to see interference or a signal dropping out momentarily. Inspecting and cleaning the (EGR) valve and the (EGR) port in the intake manifold; should cure the problem. Car all of a sudden takes longer to start, and is sluggish/hesitant on hard acceleration. Back probing is the best approach, using excessive force on the contact points can cause them to widen. A garage may charge $100-$250 to fit a coolant sensor. These type tools are a step above a simple code reader but still aren’t very expensive and will likely pay for them selves many times over. The engine will need to be running and the test will need to be performed through the heat cycle. Just like a bad coolant sensor, a bad air temperature sensor can upset the fuel mixture causing stalling problems. Another symptom of a problem with the coolant temperature sensor is an overheating engine. Old cars are more than metal and paint, they’re time travelling memory machines. Go ahead and remove the sensor plug, using a DVOM set to ohm’s. The sensor comprises of an electrical connector end and a probe end. It directly effects, cooling and fueling of the engine and therefore effects how the engine performs. This again will cause engine stalling. Check for loose or broken vacuum hoses; leaks around the intake manifold gasket or throttle body; leaks around the (PCV) valve and (EGR) valve. Plug the sensor back in, start the engine an allow idle for a few minutes. Causes of low compression in car engines. The problems that arise from an engine vacuum leak can be more than annoying. If the vehicle is more than seven or eight years old the fuel pump would certainly be suspect. Check resistance when the engine is cold and note the reading. Consequently, It will also show symptoms similar to when your vehicle has; low fuel pressure from a faulty fuel pump. So, bad gasoline in your tank can cause stalling problems in a car engine. An intermittent fault will be difficult to catch using a voltmeter. The faulty sensor might send a wrong signal to the computer, leading to a miscalculation in the engine timing and fuel calculation. Can you drive with a bad coolant sensor? Place a drain pan under the engine, some coolant will flow from the ECT housing. It might be loose or corroded. My more usually diagnoses starts with a visual. The information it supplies however is critical to how your vehicle runs. Cleaning the idle air bypass circuit in the throttle body with aerosol throttle cleaner; will often remove the gunk and solve your stalling problem. If the amount of black smoke coming from a car is excessive, it is best not to attempt to drive the car. You run a risk of damaging the engine if the system is air locked. Coolant sensor wiring damage like chafing or rodent damaged. […], The engine cooling fan only runs when needed to help cool the engine. Fuel pressure should be within specifications when the key on, then drop 4 to 6 psi once the engine starts. Problems that come and go or only occur under certain driving or operating conditions; can be very difficult to troubleshoot. Most are torqued to about 15 lb ft, but check your model specs. Valve Stem Seal – Controls Valve Lubrication As Well As Oil Consumption, Timing Belt – Transfers The Rotation Of The Crankshaft To The Camshaft, Diagnosing intermittent temperature related engine problems can be a challenge; especially if they affect driveability. If you notice this with your car, get your car checked out by a pro ASAP. This sensor tells the (PCM) the temperature of the air entering the intake manifold. The sensor itself isn’t very impressive, made from brass to prevent corrosion it can fit easily in the palm of your hand. If you lost a ton of coolant, you’ll need to bleed the system. The sensor can also show faulty readings due to accumulation of oil and carbon, wear and tear. A bad coolant temp sensor can cause the computer to over fuel or under fuel the engine, either of which could cause stalling> If the coolant sensor is bad and tells the (PCM) the engine is colder or warmer than it really is; that can confuse the fuel mixture results. If your engine stalling problems are too much for you too handle, then it might be worth looking into purchasing another vehicle. Unplugging the engine coolant temperature sensor before starting the engine may result in a no start, especially likely on a cold morning. The cost of a coolant temperature sensor ranges from $20-$50. In turn, other on-board control modules such as HVAC for example will make decisions based on these temperature readings also. Bear in mind, sensors aren’t that expensive and although I’m not in the habit of throwing parts at a car I do understand, doesn’t make sense buying test equipment to diagnose a $20 part.
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