Welcome to our BMW Forums

bleuet6 · 04-21-2009, 01:09 PM

Wondering if anyone knows what the voltage readings should be at the crank sensor and cam sensor. I measure 5 volts at the crank sensor but have erratic voltage readings at the cam and only when being cranked over. I am wondering if this may be my probelm with this car.

thanks

Brian

mirek · 04-21-2009, 04:23 PM

You should be measuring ohms, measure the crank using pin 1 and 2, should be approximately 1300 +/- 10%

bleuet6 · 04-22-2009, 07:21 AM

I have done that as far as the sensor is concerned. what I am asking is what voltage should be going to the sensor from the computer

bleuet6 · 04-22-2009, 07:22 AM

I have measured the sensors. They are fine. What I am asking is the voltage going to the sensors from the computer.

**Blackice** · 04-22-2009, 11:09 AM

I think you would need to look at the signal, Which would require a oscilloscope.

So, I don't think measuring voltage will help you.

Does it run ?
Start ?

mirek · 04-22-2009, 01:09 PM

IIRC 5vdc power in pin 1, reading in pin 2 and 3 should range 0-5v.

a bad CPS should trigger a CEL

bleuet6 · 05-04-2009, 01:57 PM

Well broke down and brought it to a reputable mechanic who was recommended as honest. Well he was and what he found is as I suspected the timing was off. I was not sure why but it had to do with the crank shaft wheel which is why I had initially swaped the sensor for it. BMW have this crank shaft wheel attached to the crank shaft via rubber for vibration dampening. Would you not know it the rubber shifted (separated from the metal) slightly causing the timing to be off so that it would not run. Just like BMW to be different from anyone else. Just like the drive shaft rubber coupling that disintegrated on me last summer. I guess they are big on rubber to metal coupling. Well this mechanic took a couple of minutes to line up the marks for this wheel and the timing chain to realize it had shifted some how. To bad my shop manual did not mention that one.

04-21-2009, 01:09 PM	#1 (permalink)
bleuet6 newbie Name: Brian Joined: Jan 2009 From: ottawa Posts: 9 iTrader: 0 Thanks: 0 0 Times in 0 Posts	318 I 1994 timing issue Wondering if anyone knows what the voltage readings should be at the crank sensor and cam sensor. I measure 5 volts at the crank sensor but have erratic voltage readings at the cam and only when being cranked over. I am wondering if this may be my probelm with this car. thanks Brian

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
1991 e30 320i Cabrio check panel issue with rear lights?	steinbachphoto	3-Series	6	10-30-2008 10:00 AM
Adjust M42 Cam Timing	crunk3	3-Series	5	03-12-2008 07:26 PM
Please Help, Subframe Bolt Issue, Any shop recommendations?	E30M20B25	BMW Tech Discussions	9	11-26-2007 10:26 PM
Help help on adjusting timing :(	PPP	BMW Tech Discussions	3	11-21-2007 01:16 AM

New To Site?	Need Help?
Register to Participate View Forum Leaders Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

04-21-2009, 04:23 PM	#2 (permalink)
mirek Senior Member Name: Mirek Joined: Apr 2008 From: Vancouver Posts: 175 iTrader: 0 Thanks: 0 4 Times in 4 Posts	You should be measuring ohms, measure the crank using pin 1 and 2, should be approximately 1300 +/- 10%

04-22-2009, 07:21 AM	#3 (permalink)
bleuet6 newbie Name: Brian Joined: Jan 2009 From: ottawa Posts: 9 iTrader: 0 Thanks: 0 0 Times in 0 Posts	I have done that as far as the sensor is concerned. what I am asking is what voltage should be going to the sensor from the computer

04-22-2009, 07:22 AM	#4 (permalink)
bleuet6 newbie Name: Brian Joined: Jan 2009 From: ottawa Posts: 9 iTrader: 0 Thanks: 0 0 Times in 0 Posts	I have measured the sensors. They are fine. What I am asking is the voltage going to the sensors from the computer.

04-22-2009, 11:09 AM	#5 (permalink)
Blackice Moderator Name: Dave Joined: Oct 2007 From: North Vancouver Posts: 1,088 iTrader: 0 Thanks: 43 47 Times in 46 Posts Blackice's pictures '91 BMW 318i '91 BMW 318IS	I think you would need to look at the signal, Which would require a oscilloscope. So, I don't think measuring voltage will help you. Does it run ? Start ?

04-22-2009, 01:09 PM	#6 (permalink)
mirek Senior Member Name: Mirek Joined: Apr 2008 From: Vancouver Posts: 175 iTrader: 0 Thanks: 0 4 Times in 4 Posts	IIRC 5vdc power in pin 1, reading in pin 2 and 3 should range 0-5v. a bad CPS should trigger a CEL

05-04-2009, 01:57 PM	#7 (permalink)
bleuet6 newbie Name: Brian Joined: Jan 2009 From: ottawa Posts: 9 iTrader: 0 Thanks: 0 0 Times in 0 Posts	Well broke down and brought it to a reputable mechanic who was recommended as honest. Well he was and what he found is as I suspected the timing was off. I was not sure why but it had to do with the crank shaft wheel which is why I had initially swaped the sensor for it. BMW have this crank shaft wheel attached to the crank shaft via rubber for vibration dampening. Would you not know it the rubber shifted (separated from the metal) slightly causing the timing to be off so that it would not run. Just like BMW to be different from anyone else. Just like the drive shaft rubber coupling that disintegrated on me last summer. I guess they are big on rubber to metal coupling. Well this mechanic took a couple of minutes to line up the marks for this wheel and the timing chain to realize it had shifted some how. To bad my shop manual did not mention that one.

Welcome to our BMW Forums

318 I 1994 timing issue