BMW 316i 1.6 1995. is there any geniuses out there,This car defies logic.When cranking there is no spark from coils 2+3 but 1+4 are fine,the car starts on two cylinders (eventualy),soon as you release the key all 4 coils spring to life an the car runs perfect. Changed Crank sensor, cam sensor,coil pack and ECU. (and starter motor after burning one out)My local Auto Electricians charged me £115 to tell me they couldnt fix it either.
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Re: NO spark on coils 2+3 when cranking.
Double check the ground. Make sure that the negative terminal on the battery is clean and tight and that the ground onto the engine is not corroded. Now make sure that the coil is getting proper power. Is power coming out of the coil and into the distributor. Remove the distributor cap and rotor and look for any signs of arcing (burned spots) under the rotor. Is the electronic ignition burned out? Use a multi-meter to check the circuits here. Does electricity pass through?
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With engine cranking test the negative side of coil with a logic probe it should flash if light stays red the remove distributor cap and rotor look for the 2 wires that come from the center pick up coil and test for a flashing signal if not then replace if ok then replace ignition module.
This could go several ways #1 engine mechanical check cranking compression should have 125 psi or greater in all cylinders if low but even squirt oil (1/2 oz.) in 1 cylinder and retest goes higher then rings sealing has been lost. if uneven check timing belt for jumped or misalignment. #2 electrical does it have electrical spark to plugs crank engine with a spark plug connected to spark plug wire laying plug on engine can you see spark? No test ignition coil wires with a logic probe both terminals will be red with key on one will flash red/green when engine cranking does not the primary ignition needs repair Ignition module? or pick-up coil/ crank sensor. #3 fuel system pressure and injection pulse. injection pulse can be tested with logic probe DONOT USE A TEST LIGHT YOU CAN RUIN THE ECU .
Spark is created by the ignition module and crank shaft sensor remove distributor cap and use a logic probe red led shows positive voltage green shows negative voltage. the crank sensor has two wires with key on touch the leads and find the power side then have someone crank it over logic probe should flash a yellow color or toggle green red (2 bulb model) that shows a good sensor replace module. stays red then replace sensor.
Uh, you'd need a degree in engineering to even attempt it. Are you really willing to go to the mat for a 92 caravan? You want to take on the computer and defy its logic to determine optimum ignition advance and fuel requirements based on input from the crank position locater sensor?
My point is you won't get no spark by bypassing that sensor. Critical for the computer to get that input before it sends the signal to the ignition module to initiate spark from the coil. BTW, you never said why you would want to bypass it.