Intermittent CPS Code - E46Fanatics E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 02-10-2015, 06:40 AM   #1
Lucas_SF
Registered User
 
Join Date: Aug 2014
Location: Curitiba - Brasil
Posts: 7
My Ride: 328i E46 1999
Angry Intermittent CPS Code

Hi!
In the last 4 months I'm having a big trouble with a Inlet Camshaft Position Sensor in my 328i 99.
I'm having the classic symptoms of a bad cam sensor:
- Loss of power, stalling, difficult to start the engine.

All of this symptoms comes up only with hot engine and it gets worse in hot summer days (The car almost don't run in high external temperatures after driving for a while)

I took it to a BMW specialist, he scanned the car an finds a Inlet CPS code (the same I got in my BMW 1.4.0 Scanner). The sensor has been changed and the harness rebuild. Problem still there.

Now the mechanic says that the problem lies in the ECU, but I'm not pretty sure of that.

Is that possible that a problem with the ECU have the only symptom of a CPS bad signal reception?
A ECU problem will come up only with hot engine?
I'm thinking that might be a faulty new sensor or something else, but I don't know if faulty sensors have this intermittent symptoms...
Any help would be great

Thanks
Lucas_SF is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 02-10-2015, 08:28 AM   #2
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
Did you install an OEM sensor?
Aftermarket sensors are notoriously unreliable.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 02-10-2015, 10:00 AM   #3
Lucas_SF
Registered User
 
Join Date: Aug 2014
Location: Curitiba - Brasil
Posts: 7
My Ride: 328i E46 1999
It's not an OEM sensor.
My first thought was buying another sensor (OEM), but the mechanic says that the problem isn't the sensor. Now I'm in doubt
Lucas_SF is offline   Reply With Quote
Old 02-13-2015, 06:17 AM   #4
Lucas_SF
Registered User
 
Join Date: Aug 2014
Location: Curitiba - Brasil
Posts: 7
My Ride: 328i E46 1999
Up!
Lucas_SF is offline   Reply With Quote
Old 02-13-2015, 09:20 AM   #5
Solidjake
Zero. Leaks.
 
Solidjake's Avatar
 
Join Date: May 2008
Location: NYC
Posts: 31,104
My Ride: '02 330i 6MT
Aftermarket sensors should not be used for such a critical thing. Get an OEM one. I would not continue with anything else until the OEM sensor is used.
__________________
Solidjake is offline   Reply With Quote
Old 02-13-2015, 10:34 AM   #6
jfoj
OEM ///Member
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 23,192
My Ride: 330CiC, M5, X5, E93
^+1 OEM sensor.

It is not that the OEM sensors are so much better, the issue is non OEM sensors can be such garbage.

Example, may not be your exact case, but why does a sensor on ebay maybe cost $22 but the same OEM sensor from a decent supplier cost say $60?

Which one would you recommend and use?

There is a reason for the ultra cheap replacements and it is not usually a wise idea to consider these.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
jfoj is online now   Reply With Quote
Old 02-13-2015, 10:59 AM   #7
Lucas_SF
Registered User
 
Join Date: Aug 2014
Location: Curitiba - Brasil
Posts: 7
My Ride: 328i E46 1999
That one was sold me like an OEM one, but the signal doesn't even show a square wave on the osciloscope, like it should be.
I'll return it to the store and get my money back.
My doubt is if a low quality sensor can show intermittent issues or it will not work at all...

Anyway I will buy an OEM one and see what happens.
Sorry for any english mistakes.

Thanks
Lucas_SF is offline   Reply With Quote
Old 03-27-2015, 11:48 AM   #8
Lucas_SF
Registered User
 
Join Date: Aug 2014
Location: Curitiba - Brasil
Posts: 7
My Ride: 328i E46 1999
Now the car is running with two new sensors - exhaust and intake side (both OEM this time). The VANOS unit was removed and it was full of oil sludge, so it was replaced by another one, clean and revised.
The camshaft variation is ok now.
BUT, the code still comes intermittently, with the same symptoms.

Now I have no clue of what might be causing this.

Any ideas?
Lucas_SF is offline   Reply With Quote
Old 03-27-2015, 11:51 AM   #9
Solidjake
Zero. Leaks.
 
Solidjake's Avatar
 
Join Date: May 2008
Location: NYC
Posts: 31,104
My Ride: '02 330i 6MT
I might not be correct but next step is the vanos and it's solenoids. Since you replaced the vanos then it might be the solenoids but there should be a fault code for that.
__________________
Solidjake is offline   Reply With Quote
Old 03-27-2015, 12:40 PM   #10
Lucas_SF
Registered User
 
Join Date: Aug 2014
Location: Curitiba - Brasil
Posts: 7
My Ride: 328i E46 1999
I'm thinking about put the intake side solenoid in the exhaust side to see if the code changes to the exhaust side.
Will that work?
Thanks for the reply
Lucas_SF is offline   Reply With Quote
Reply

Tags
camshaft position sensor, cps, ecu, loss of power, stalling

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 08:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - VerticalScope Inc. All rights reserved.