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Old 01-25-2009, 09:11 AM   #1 (permalink)
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Got a crank no start issue and need some suggestions thanks :)

Just bought a 99 z3 2.3 from my dealer that some guy traded in for an slk and ive had it about 2 and a half months and one day when gettin in the car it would crank and wouldnt start. Towed it to my dealer and checked for spark, fuel pressure and injector pulse. got pressure but injectors arent pulsing and coils are being grounded. Thought ehh maybe its just a crank sensor but that didnt work out still same problem. pulled the engine computer cover and noticed the relay for the secondary air pump had a burnt wire underneith it. its the wire for 87a of the relay to ground. tested the pump and the relay and tested good. I just about literally tested all the other wires in that box to make sure i wasnt gettin any high resistance from that wire burning up. everything tested good. i was just wondering if anyone has had this problem and hopin it isnt the engine computer. Anyone think its the immobilizer unit? i dont have any bmw test equipment and would hate to just throw parts on it and not work. any suggestions would greatly be appreciated. thanks
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Old 01-25-2009, 11:50 AM   #2 (permalink)
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If you have a spark and there is no fuel pulse,its got to be the camshaft sensor as this controls the injectors.
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Old 01-25-2009, 12:39 PM   #3 (permalink)
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yah i havent checked that out yet but i dont have spark i got power to my coils but my computer isnt lettin the coils fire off my plugs thats why i didnt check it but i guess it wont hurt to try. i took the computer apart and didnt find any burnt resisters or transisters or anything so i ruled out the ecm but i could be wrong. i read a bulletin on the immobilizer units goin out for a certain production range but mine didnt fall in the production range of the affected cars. but maybe it did i dunno i dont have any way to test it.
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Old 01-25-2009, 12:47 PM   #4 (permalink)
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I knew someone else who had this same problem and it ended up being the camshaft position sensor just like marti5 said. I hope you get things all straightened out!
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Old 01-25-2009, 01:09 PM   #5 (permalink)
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that would be really cool cause its cheap and easy lol. i appreciate your input! ill check it out and let yall know
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Old 01-26-2009, 12:31 PM   #6 (permalink)
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which cam sensor was it? intake or exhaust
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Old 01-28-2009, 11:19 AM   #7 (permalink)
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Cam sensor, Ignition wire set??

If it winds up having anything to do with your ignition wires, we sell a set:

Bmw Ignition Wire Set Z3 Roadster 1.9 1996-1998

Also have a certified tech on duty if you want to run any scenerio by him for fixing the problem.

Good Luck!!
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