1992 dodge 318 engine turns over, but no start. No spark present. Replaced ignition coil and pickup coil, still no spark. 1992 dodge ram 150 full size truck 318 engine. starts sometimes then wont start just cranks ive tried a coil and pick up coil and now they said it might be a crank position sensor .

If you have a distributor and a pick-up coil inside the dist and you replaced the pick-up then you do not have a crankshaft position sensor. CPS is used on engines that have no distributor and use the sensor to locate No 1 cylinder to fire the coils in the right order. The pick-up that you have inside the distributor tells the coil when to fire. The rotor spins around and gives the spark to each cylinder. The spark goes from coil to center of dist. and through the rotor to the plug towers. Check for spark at the coil wire entering the dist.If o/k, check for spark at the wires coming out of the dist. IIf o/k then you may have a problem that occurs now and then. Possible carbon tracks inside dist cap. Possible rotor has burn through to dist. shaft. Spark should go to dist and come out. Humidity and moisture can affect this. If you check all this and you still have "no start", then you should be sure that the fuel system is operating correctly. If this has helped, let me know. If you need more info, post what you need. Moe If you have a distributor and a pick-up coil inside the dist and you replaced the pick-up then you do not have a crankshaft position sensor. CPS is used on engines that have no distributor and use the sensor to locate No 1 cylinder to fire the coils in the right order. The pick-up that you have inside the distributor tells the coil when to fire. The rotor spins around and gives the spark to each cylinder. The spark goes from coil to center of dist. and through the rotor to the plug towers. Check for spark at the coil wire entering the dist.If o/k, check for spark at the wires coming out of the dist. IIf o/k then you may have a problem that occurs now and then. Possible carbon tracks inside dist cap. Possible rotor has burn through to dist. shaft. Spark should go to dist and come out. Humidity and moisture can affect this. If you check all this and you still have "no start", then you should be sure that the fuel system is operating correctly. If this has helped, let me know. If you need more info, post what you need. Moe

Crank sensor is located at the rear of the motor between engine block and trans housing. On the passenger side. Near the distributor. A small bolt or two holds it in place, Once the bolts are out the sensor will need to be pulled up and out. A two wire lead is attached to a connector and can be seperated. This sensor is about 2-3 inches long and about 1/2 inch thick. It is made of hard plastic and can be britle after it has been in the engine for a long time. This sensor is a wire wound magnet that digitally keeps track of a cogged wheel inside the trans housing.Hope this helps Moe Crank sensor is located at the rear of the motor between engine block and trans housing. On the passenger side. Near the distributor. A small bolt or two holds it in place, Once the bolts are out the sensor will need to be pulled up and out. A two wire lead is attached to a connector and can be seperated. This sensor is about 2-3 inches long and about 1/2 inch thick. It is made of hard plastic and can be britle after it has been in the engine for a long time. This sensor is a wire wound magnet that digitally keeps track of a cogged wheel inside the trans housing.Hope this helps Moe