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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-20-2012, 12:24 PM
bigharry83 bigharry83 is offline
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Red face just bought a sweet 323i but weird problem

Hello people, I am new to owning a BMW therefore new to this site. I have a question I was wondering if anyone could help please? I have just bought a '99 323i. I had the triangle and eml warning lights appear and after taking it to the garage and tested on computer was told it was the camshaft sensor. I had it replaced yesterday and she drove like a dream!! However, i fired it up this morning and the same lights appeared after about 3 minutes? Limp mode again. I drove to garage, (which was closed) turned it off and back on and boom, no lights and running fine??? Is it likely its just when jts cold? Maybe a bit of condensation on the sensor? Its seems fine when the car is warm? Any advice welcomed before taking to garage again. Thanks in advance
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  #2  
Old 10-20-2012, 02:20 PM
stickbuilder stickbuilder is offline
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Lots of things can cause this issue. Most common are vacuum leaks/unmetered air. Check your intake hoses for splits and tears, also check the rubber hose that goes between the dipstick tube and the CCV. Does your Secondary Air Pump run for a couple of minutes when the car is cold?
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  #3  
Old 10-21-2012, 01:40 AM
bigharry83 bigharry83 is offline
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Hi thanks for reply. I have just fired it up this morning (after running perfectly again last night) and the same thing. Perfect turn over, ran fine for about 3 minutes then the 2 lights crept back on. I removed the pipe to secondary airpump and it was sucking air?
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Old 10-21-2012, 01:56 AM
lgr122 lgr122 is offline
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I would check that camshaft sensor electric plug and try clean it somehow, if there's bit something which disturb connection.
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  #5  
Old 10-21-2012, 10:10 AM
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Another possibility:

Was that CPS direct from a BMW dealer ? Aftermarket sensors are notorious for quickly failing, and being defective right out of the box.
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  #6  
Old 10-21-2012, 11:17 AM
bigharry83 bigharry83 is offline
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Quote:
Originally Posted by lgr122 View Post
I would check that camshaft sensor electric plug and try clean it somehow, if there's bit something which disturb connection.
hi, yes I checked the plug and seems clean enough...
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  #7  
Old 10-21-2012, 11:19 AM
bigharry83 bigharry83 is offline
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Thanks fast bob I will enquire when I take the car back to the garage tomorrow. I have just got home in it now and again she drives like a dream. I hoping its not a big problem as it only seems to play up when the cars cold.
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  #8  
Old 10-21-2012, 01:02 PM
QAfred QAfred is offline
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Quote:
Originally Posted by bigharry83 View Post
Hello people, I am new to owning a BMW therefore new to this site. I have a question I was wondering if anyone could help please? I have just bought a '99 323i. I had the triangle and eml warning lights appear and after taking it to the garage and tested on computer was told it was the camshaft sensor. I had it replaced yesterday and she drove like a dream!! However, i fired it up this morning and the same lights appeared after about 3 minutes? Limp mode again. I drove to garage, (which was closed) turned it off and back on and boom, no lights and running fine??? Is it likely its just when jts cold? Maybe a bit of condensation on the sensor? Its seems fine when the car is warm? Any advice welcomed before taking to garage again. Thanks in advance
what were the codes? that lead the tech to cps.
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  #9  
Old 10-22-2012, 09:35 AM
bigharry83 bigharry83 is offline
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Hi all, took the car to BMW specialist today, he ran diagnostic test. Said there was a crushed breather pipe to one of the cylinders and also throttle body problem. Before I buy a new throttle body I will strip and clean mine this weekend. Fingers crossed. I will keep you posted.
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  #10  
Old 10-22-2012, 06:51 PM
QAfred QAfred is offline
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I have read where cleaning the throttle body and the idle control valve resolved problems with a car going into limp mode; when the throttle sticks it can cause a failsafe mode so you do not have unintended acceleration, but more often it is electrical in nature (battery, grounds, wiring at the throttle itself). In other words voltage is getting interrupted to the throttle body.

The motor driven throttle valve receives input via the throttle cable on our 323's. WHile you are in there you need to check power supply, ground connections, etc to the throttle body. If that is ok you need to check the throttle potentiometer. It has a redundant check when the throttle body butterfly moves. There are two potentiometers one that should be at .5 to 4.5 volt movement and another that sees a .5 to 2.5 volt movement as you move the butterfly valve. If one is bad the eml or electrically driven throttlebody will go into failsafe to prevent unintended acceleration. If cleaning it don't work and your wiring is good and you dont want to go to a dealer or back to your mech you might want to try a used throttle body.
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  #11  
Old 11-10-2012, 09:08 AM
bigharry83 bigharry83 is offline
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Hi all, thanks for the responses. Today I managed to finally clean my throttle body and icv. I checked all connections etc and inspected the intake boots and they seem fine. Fired it up then again after about a minute same problem. I'm thinking it might be time to go to the garage :-(
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  #12  
Old 12-07-2012, 03:27 PM
grrltraveler grrltraveler is offline
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Bigharry, any resolution on this? I have a similar sounding issue on my 02 330i...

Anne
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  #13  
Old 12-08-2012, 09:39 AM
bigharry83 bigharry83 is offline
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Hi, sorry for late reply. My wife took it to the garage but this time the computer could not read the car!? I am going to try a throttle body from a breakers yard and hopefully it will sort it. I'm pretty sure it must be that. I will keep you posted
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  #14  
Old 04-04-2013, 12:19 PM
bigharry83 bigharry83 is offline
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Unhappy

Hey all, I know it's been ages and this car has now became my project. I bought a obd scanner and it spat out fault codes relating to air mass sensor and electric control module. I bit the bullet and fitted a new air flow sensor and re tested. Sorted, 1 code gone. However, the battery required a jump start last weekend it was flat as a pancake. Could the po601 code possibly be related to a low voltage or battery?
Thanks for any advice.
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