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1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

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Old 01-17-2009, 09:44 PM   #1 (permalink)
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Wink 740IL Cam Sensor doubt diagnosis

Hi All.
I'm new but have been reading alot on E38 and areas. My mechanic states I need a new Cam Sensor according to my SES readout. (of which I don't know what the code is). My understanding is that if the Cam Sensor was bad, the car would be stalling or not starting. The only thing I noticed it's doing is, sometimes a "jump" when I slow down and take a turn while applying the gas coming out of it. Usually turning to the left. I don't want to pay for a part I don't need. But if I do, can probably DIY.
Any ideas? 99' 740IL 139,000

Last edited by 740Gal; 01-17-2009 at 09:51 PM. Reason: added info
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Old 01-18-2009, 05:43 AM   #2 (permalink)
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Deffo DIY, Camshaft sensor mainly controls the injectors, as why it does it when you turn left should not make a difference to the cam sensor, when was the last time you changed the fuel filter?? as it sounds more like a fuel problem to me.

You also mention a 'jump' do you mean transmission jump as no forward drive for a second then kicks in?? if so when was the last time you had a transmission service?? should be done 80-90K then every 30-40K.
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Old 01-18-2009, 08:08 AM   #3 (permalink)
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Hi Marty,

They are getting ready to service the trans this week, as the seal needs replacing. So maybe that will cure the "jump". And yes, that's what I mean. As I come out of the turn it jumps.
As for the fuel filter, they just did an oil change, but did not list all they replaced. I doubt they changed it.
I assume I'm right on the Cam Sensor? If it was bad it would be stalling or not starting? Thanks.
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Old 01-18-2009, 08:24 AM   #4 (permalink)
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Well, It should go better after a transmission service ( no jump) make sure they change the trans filter and not just give it a clean, as for the cam sensor, yes you are up the right street so to speak, you also have a crankshaft sensor, which will make it not start.

What I would do, is get them to erase the error,and re do a diagnostics again say in around 2 weeks if the same thing comes back then its on its way out, if all is clear dont worry, sometimes these cars pop up errors at Lib.

I dont think you have anything to worry about at this stage, but I would advise a fuel filter change anyway.

If you get any further problems just PM me.
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