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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 03-11-2014, 07:55 PM
commandervp6 commandervp6 is offline
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May I present symptom(s)

I have a 97 BMW 740il and the only symptom I have honestly is it stalls after starting once in a while. The check engine light is on also. I read the code and can't remember other than it had to do with camshaft position sensor, might not have had a number code or just generic. Aside from what I have heard, what is the probable issue, crankshaft or camshaft position sensor in terms of what is more common with these? Looks like the camshaft is 3X the cost of the crankshaft position sensor, in California..
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  #2  
Old 03-11-2014, 09:05 PM
sigtwenty sigtwenty is offline
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Maybe read the code and report back......let's not speculate and throw parts theory at it

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  #3  
Old 03-11-2014, 10:06 PM
CitizenOfDreams CitizenOfDreams is offline
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+1, read the code, and don't swap any parts until you do.

Having said that, I once left my camshaft sensor unplugged and got the same symptom: starts and runs fine, but sometimes dies after starting the engine and putting the car in gear.
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Old 03-12-2014, 08:00 AM
commandervp6 commandervp6 is offline
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Cleaning CPS

Is there any truth that cleaning the CPS solves any issues, I have bought the part already and they are pretty easy to put in, I will check that pin 1 & 2 have a steady 490 ohms first.
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  #5  
Old 03-12-2014, 08:26 AM
CitizenOfDreams CitizenOfDreams is offline
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Quote:
Originally Posted by commandervp6 View Post
I will check that pin 1 & 2 have a steady 490 ohms first.
You are confusing crankshaft sensor (which is a simple inductive coil) and camshaft sensor (which is an active device based on a Hall sensor). You will not measure anything like "490 ohms" on a good camshaft sensor.
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  #6  
Old 03-12-2014, 04:13 PM
commandervp6 commandervp6 is offline
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Thanks for clearing that up

So how do I test the camshaft sensor, is the burning question?
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  #7  
Old 03-12-2014, 04:22 PM
INFAMOUS FAME INFAMOUS FAME is offline
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Try maf sensor thats what i had on my 97 installed new maf and it cleared all my misfires and camshaft codes .best to run the codes on it first before you go replacing things
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  #8  
Old 03-12-2014, 06:02 PM
CitizenOfDreams CitizenOfDreams is offline
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Quote:
Originally Posted by commandervp6 View Post
So how do I test the camshaft sensor, is the burning question?
The easiest way I can think of would be looking at pin 2 with an oscilloscope on a running car.

Do you have a particular reason not to trust the OBD codes?
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  #9  
Old 03-12-2014, 09:10 PM
sigtwenty sigtwenty is offline
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Post the codes!

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  #10  
Old 03-13-2014, 10:04 PM
commandervp6 commandervp6 is offline
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I traded it away for a 95 318iA!

Bought an aftermarket cps, installed it and it wouldn't even stay running as long, worse than before. I ended up trading it away so I will never know.
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Old 03-13-2014, 11:16 PM
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FABOCH FABOCH is offline
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Quote:
Originally Posted by commandervp6 View Post
Bought an aftermarket cps, installed it and it wouldn't even stay running as long, worse than before. I ended up trading it away so I will never know.
I guess the advise of pulling codes by members aren't suffice. Throwing parts at it sure won't fix it
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  #12  
Old 03-14-2014, 01:19 AM
commandervp6 commandervp6 is offline
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Misunderstood

I appreciate all the advice. The car was traded for different reasons. My mechanic does think that it WAS the cps because of it running worse with an "aftermarket" than the one currently installed "oem" and the advice is appreciated.
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