The PCM uses the trigger signal from the crankshaft position sensor, and/or camshaft position sensor to pulse the injectors. Obviously with false throttle body codes but with throttle body unplugged, that is the only way the vehicle will start. Although maybe possible, most likely not probable. So, based on your voltage tests, your tps is no good, so the first thing you need to do is replace the tps. 1. If either one of these were to malfunction, then the engine would not be able to start. … ... i doubt it! Replacing The Throttle Position Sensor. If the spark plugs are old, worn, fouled, or damaged, they might not spark. Edited by Mark on 1/30/2011 at 12:42 AM EST Expect a total of 100$ to 300$ for replacing the accelerator pedal position sensor. This is most noticeable when at idle, when on the highway with the cruise control set, or when keeping the throttle steady with your foot. While it is running you can plug it back in and will stay running but it still has almost no throttle response from pedal. Symptoms of a bad tps include rough idling, fuel-rich signs such as fouled spark plugs, black smoke ROM the exhaust, etc. Apply a few drops of anti-stick solution to the tip of the replacement throttle sensor and install it in the throttle chamber. If failure happens, there can automatic transmission shifting problems. rough or irregular idlying problem. If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The cost differs a lot depending on if you can replace just the position sensor or, like in some car models – you have to replace the whole accelerator pedal, which makes it much more expensive. A worn-out belt can prevent the Crankshaft-Camshaft Position Sensor from synchronizing, causing the sensor to send the wrong signal. The TPS tells the computer how far the throttle is open. 2. The anti-stick solution will make it easy for you to remove the TPS in case you need to replace it again. This sensor is also used to gauge the engine load. Can Bad Spark Plugs Cause a Car To Crank But Not Start? When you turn on the key the injectors should receive battery voltage. Remove the faulty sensor from the throttle chamber. ... A failing TPS can cause the engine to search for an idle or surge. I … The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide. In theory, this could cause a no start, but in actual fact I have never seen this cause a no start. 1. When there’s no spark, there’s no starting. Still diagnosing the problem but have already replaced throttle body and harness with no success. no it wont make it not start,it will make it hesitate and loose power but it should still start,one way to find out is disconnect it ,the car should still start with it disconnected,good luck. 4. You could also have a faulty throttle position sensor which would prevent the spark from being generated in the internal combustion cylinder. 3. i had a bad throttle position sensor on my car and it still started, didnt idle worth a crap but it started. Throttle Position Sensor. If you have over 4 volts on both wires, then you have a bad tps. Symptoms of a bad throttle position sensor. 4) Starter Motor. The job of the Throttle Position sensor is to gauge throttle position- that is controlled by the gas pedal. Here are some common symptoms of a bad or failing throttle position sensor to watch for: 1. The labor cost can range from $50 to $100 at a workshop. 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