2004 Chevy Trailblazer 4.2L check engine light. How to replace cam and crankshaft position sensors? Answer: Cam Solenoid The crank position sensor is located on the drivers side of the engine, along with a few either sensors. You can either jack up the truck and take the drivers side wheel off to access the sensor. It is actually easier to get
to it from under the truck. It is just bolted on with one 10mm bolt. Crank Position Sensor Read More Below Or See These Related Articles: Download Our Ebook Fuel Economy, Hybrids & Electric, Car Repairs, Recalls And More. Then it is just a 10mm bolt that holds it in. Wiggle it and slide it out, then install the new one. After these repair, a "Cam / Crank correlation relearn" will need to be done. A high quality scan tool will be needed to do this properly. Some people have other ways to do it like letting it idle for a few minutes, or driving on the highway for 10 miles, but none of these work. If you do not do that relearn, the engine light will come on and you will have codes. This could look like the parts did not fix the problem, when they actually did. Question: Answer: Another possibility is that the sensors were not bad, and the problem is with the camshaft actuator solenoid. This is on the front of the motor and controls advance and retard of the camshaft. This will also cause your issues. Usually the solenoid itself goes bad and it just needs to be replaced. A much worse condition is that the actuator inside the motor has failed and needs to be replaced. This is a very big job. The actuator is driven by the timing chain. Question: Answer: Did you get a scanner on it and look at the PRNDL signal? Did you test the release solenoid in the shift console? Sounds like you have a short circuit. You are going to need to follow several schematics testing for open and shorts. What are the symptoms of a failing crank sensor?5 Signs of a Failing Crank Sensor. Crank Sensor Problems Could Make it Hard to Start Car. One sign that your crankshaft sensor might be failing is if you find it hard to start your vehicle. ... . Engine Vibration Issues. ... . Fuel Economy Slippage. ... . Uneven Acceleration. ... . Check Engine Light On.. Where is the crankshaft positioning sensor located on a 2005 Chevy Trailblazer?Your crank sensor is located on the left (drivers) side of the engine block towards the rear. You may need to crawl under to get to it.
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