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Re: need to remove crank sensor on 1991 940 (2 litre)
Had you had the car scanned? It could be something else? Fuel pump, relay, fuse...
Is there any spark at the plugs? Is there fuel coming to the injectors?
There are a few things that can cause a car not to start, Is the engine light on?
Best way is to get the car scannd, if not you'll end up replacing unneccesary parts by trial and error.
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the word correlation means relationship between two or more items . In this case it means that when the crank shaft sensor is triggered then the camshaft sensor has to be in agreement that the position of the piston and valves is in the right position to allow spark and fuel.. there are air gaps between each sensor and the rotor that triggers them and if this is not correct or there is dirt in the air gap ( the sensors may be a bit advanced or retarded in the fitment holes) then this relationship of positions is being interfered with and so you get the fault code. If after rechecking the fitment of the sensors and using a scanner to put the engine light off ,you still have a problem ,I would suggest that you find an accredited shop the does a lot of work on your make of car to assist with the fault.
Read the fault codes with the MAF sensor connected and it will tell you what is wrong with the sensor. If it is faulty (disconnected it is read by the cpu as such) then items such as injector operation. crank position sensor idle rpms accelerator position etc are all affected . The cpu system has to be balanced or the settings in the cpu will be out.
When fixing codes start with first code first / it dos not always mean that the sensor is the fault ,it could be in the harness / the plug or the ground. and reference signal should be tested , but in this case you most likely could get away with replacing the cam sensor, that would be the Lest expensive and easiest to start with,to git to it you will have to remove the alternator hope this is help full, the other code suggest that it could be the crank sensor , that and the plug for it does fail quite often but first things first feel free to ask if you should have any further questions , Thank you ,
it could be one of 2 things the cam sensor or the co sensor on the exhaust, both of these when warmed up will set off an eml light and confusing error codes. as when engine is stopped they reset themselves. but codes will be logged and they need to be warmed up again. cam sensor faults is when the resistance in the sensor become erratic. as it has volts on the sensor will go up and down. co sensor can be the heater as it has to heat the sensor to make the sensor reliable. it takes a few seconds for the sensor to read. if it fails and come up on eml light but then turn engine off and then start it again it can be this cam and crank sensors work the same way they can over heat them selfs of time and will both need replacing, i found its best to replace both at the same time.
1995 940 has a crank position sensor mounted at the top rear of the engine which reads cranks position off the flywheel. Though not adjustable, it is a part which fails often causing weird and intermittent no start/hard start problems as well as other faults. While the part is not too expensive, you do have to crawl on top of the engine to see it, and its a pain to replace. Guess you could remove the hood, but I have changed mine without doing so. Get light on the area,and you can do it. If you are having timing too far advanced issues (running on when killing engine or "pinging" on acceleration several other parts may be suspect. Knock sensor, spark plug issues, carbon buildup, O2 sensor, lean condition and more. Good luck.