1983 733i Manual transmission. No Start problem. Replaced both rear crank sensors, cleaned passenger front sensor, replaced motronic unit (twice, new fuel pump. No power to ignition and fuel pump does not turn on when ignition switch is in on position. Help.
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Try unplugging the cam sensor and then try to start. The cam sensor is on the underside of the passenger head towards the front of the engine. Is is accessible from under the vehicle. If it starts replace the cam sensor. Iffy it still does not start replace the crank sensor and the cam sensor.
The crank sensor is located on the passenger side of the engine block behind the starter. The starter will need to be remove to acces the sensor.
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It is on the front of the motor just under the rear part of the waterpump in the timing cover. But I doubt it is the problem. Sounds more like a bad crank sensor. Which is located behind the crank pulley.
Step 2
Open the hood and locate the (CKP) sensor to the left (driver side) of the transmission bell housing, where it meets the rear of the engine block. If necessary, shift the transmission to neutral (N), raise the front of your vehicle using a floor jack and safely support it on two jack stands. Chock the rear wheels.
Step 3
Locate the CKP sensor pigtail connector to the right (passenger side) of the transmission bell housing. Unplug the CKP electrical connector.
Step 4
Thoroughly clean the area around the crankshaft sensor using a soft brush and a shop rag.
Step 5
Note whether the CKP sensor on your Jeep model is mounted with one bolt, two bolts or two nuts. If there is only one bolt, make a note of the exact sensor position, since it is adjustable and you will need to reinstall it in the same position.
Step 6
Unscrew the sensor mounting bolt(s) or nuts using a ratchet, ratchet extension and socket of the appropriate size. If your Jeep model uses two mounting bolts, use the same bolts during the installation process. These bolts have been machined to provide the correct space between the crankshaft sensor and the flywheel. If you use bolts with a different configuration, your vehicle may not start or operate properly.
Step 7
Remove the crankshaft sensor from your vehicle.
Installing the Crankshaft Sensor
Step 1
Thoroughly clean the sensor-mounting surface on the transmission bell housing using a soft brush and a shop rag.
Step 2
Clean the mounting bolt(s) or nuts using the soft brush and shop rag.
Step 3
Check the new crankshaft sensor and make sure it has a piece of paper (spacer) glued to the bottom. This spacer serves as an electrical ground. Using the CKP sensor without the spacer will break the unit the first time you try to start the engine. If necessary, you may buy the spacer through your local auto parts store or dealership parts department. Ask for part number PN05252229.
Step 4
Install the new CKP sensor into the transmission bell housing mounting hole.
Step 5
Start the two bolts or nuts by hand and then tighten them to 9-feet lb. (12 Nm) using a torque wrench, ratchet extension and socket. If your model has only one mounting bolt, push the new sensor against the flywheel and then tighten the bolt to 60-inches lb. (7 Nm) using a torque wrench, ratchet extension and socket.
Step 6
Plug the CKP sensor electrical connector.
Step 7
Lower your Jeep if you had to raise it. Remove the chocks from the rear wheels.
If your speedometer is not working, that means your Vehicle Speed Sensor or VSS for short, needs to be replaced. The ABS light means your ABS sensors need to be replaced. There are 4 ABS sensors: Front driver's side, Rear driver's side, Front passengers side, and Rear passenger's side. Once you replace your VSS, it will start communicating with your transmission again, and the speedometer will kick in. Hope this helps.
If the crank sensor gets its signal from the torque convertor,the convertor has to go in the same way it came out,as the pickup for sensor is on the convertor...good luck...lee
Make sure that check engine light comes on when you turn the key to the on postion,then while cranking it should go out,then while cranking after a few seconds it should come back on. If it does not then PCM is not seeing a signal from the crankshaft postion sensor.
This sensor is located on the front passenger side of motor at the crankshaft pulley.You can disconnecting harness and clean it and reconnect it and see if it cranks. If not replace it.
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