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 Rating: Thread Rating: 360 votes, 4.98 average. Display Modes
Old 04-12-2014, 12:25 AM   #61
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
Checking battery voltage at pin 15 of the coil harness. Ignition needs to be on (position 2) when testing. No voltage here indicates faulty ignition switch, or wiring. These are the old style coils. Coil design changed in 10.2002.

__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"

Last edited by lszlszx; 11-03-2014 at 02:57 PM.
lszlszx is offline   Reply With Quote
Old 04-23-2014, 09:56 PM   #62
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
How to check for spark

It's possible to check for spark either at the coil, or spark plugs.

How to check for spark at the coil

Disconnect one of the coil harnesses and find pin 1. This is the signal wire from the DME. Reconnect it and pull the rubber boot back. Connect a test light to pin 1. from the back of the harness. Have someone to crank the engine. The test light should flash, indicating spark at the plug.




How to check for spark at the spark plugs

Remove a coil and spark plug. Reconnect the coil harness and place the plug back in the coil boot. Here I'm using vice grips with a slight tension to hold the plug stable in the boot. I am grounding the plug with jumper cables.
Have someone crank the engine, or position the coil/plug in such a way that you can see it from the cabin.
In this case I was able to see the plug and spark by turning the key from the passenger seat.

__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"

Last edited by lszlszx; 08-15-2014 at 07:18 PM.
lszlszx is offline   Reply With Quote
Old 04-24-2014, 09:52 PM   #63
caliber
Registered User
 
Join Date: May 2008
Location: Hong Kong
Posts: 43
My Ride: E46 328i, E92 335i
Just to share:

My 328i has the habit of no start, no crank after engine warmed up or sitting under the sun for more than an hour. Cold start is not a problem, engine fires right up whenever I turn the key.

This behaviour has been consistent for the past few months so I took it to BMW for diagnostics. They found that under the no start condition, there is no signal to the starter from the EWS so they recommend to replace the EWS.

Hence my car is sitting in BMW waiting for a new EWS shipped from Germany now. I know somebody has said that I can by-pass the EWS to always give signal to the starter whenever the key is turned but the price they charged for the job is not that expensive so I gave them a go.
caliber is offline   Reply With Quote
Old 04-25-2014, 11:26 PM   #64
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
I wouldn't mind bypassing the EWS. That way keys wouldn't cost so much.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 04-28-2014, 02:08 AM   #65
SaabTech 330m
Registered User
 
Join Date: Apr 2014
Location: Aberdeen
Posts: 4
My Ride: 330 MSport
In my 2001 e46 330M the coolant temp sensor caused the engine to "flood" and not start.

Copied this from a temp sensor thread...

Hi all new to the forum and Beemers. Now have an e46 330msport and love the car. Recently had some issues with car and found this thread. Also having troubles with hard starting and temp gauge issue. Using a generic code reader found dtc's for the temp sensor and cam sensor. I first replaced the cam sensor, there was an improvement, and it seemed to be starting fine for a couple weeks. But again the car would not start and would take an hour or more before re-starting. I found that the temp senor was reading full cold when the car would not start. This makes the computer think it's -40 f and rich-ens the mixture enough to foul the plugs. I also have new and correct ngk plugs in. I have been a tech for 20+ years with Saab, Subaru, GM as well as customs, racing cars boats etc. with fuel injection and am now learning about my bmw. Sounds to me like the original question was confused by the "mechanic" who does not know bmw's. The ECT engine coolant temp sensor sends a signal to the computer and controls the gauge, it is in the cylinder head below #6 intake port. This has nothing to do with oil temp. There is also a coolant temp sensor in the lower radiator hose, for fan control only. Now for the good part, I was able to change the sensor without removing the intake. It is difficult but using a deep 22mm socket a universal and a wobble extension I was able to replace it by just removing the cowl in well under two hours. The car now runs great again and starts every time, really a great car

Spark/timing, air, fuel, compression, find which is missing and your well on your way...




SaabTech 330m is offline   Reply With Quote
Old 04-28-2014, 03:23 PM   #66
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
Thanks for the info!
I remember this being a common problem with the older cars.
One of the first parts I replaced on my E28 when it didn't start was the CTS.

Engine is flooded due to a faulty coolant temperature sensor.
The temperature gauge reading cold with the engine warm can be a giveaway.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"

Last edited by lszlszx; 05-04-2014 at 09:25 PM.
lszlszx is offline   Reply With Quote
Old 05-06-2014, 05:26 AM   #67
03-M3-Vert
Registered User
 
Join Date: Feb 2014
Location: Jax, FL
Posts: 22
My Ride: TiAg Convertible M3
I've got a "no-start" situation.

History - In the 1st week of ownership (Feb '14), I had a similar situation, car jump-started okay. New battery solved that. I thought w/out knowing the history, that was fair.

Sunday I spent some time detailing the car (doors open for extended periods of time) and afterward, car would not start. Jump started fine, put car on battery charger Monday. Car wouldn't start.

Car won't jump-start now either.

Just for kicks picked up new battery, no change. OBC shows 12.6 - 12.7v.

When I turn the key to "Start" all sorts of extra sound whirls to life, just no starter engagement, or solenoid "click" like other cars.

Research seems to point to starter. Does this seem unusual for 44K miles? Is that something that will set a "code" that can be pulled to know for sure?

Any other ideas before I tow it in (daily driver)? Car is sitting at my Dad's house.

I want to learn all I can about this thing - I love this car so ...
03-M3-Vert is offline   Reply With Quote
Old 05-06-2014, 09:38 AM   #68
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
SMG, or manual?

Yes, 44K is early for a starter to go south.
Nevertheless, checking voltage at the starter is a really helpful trouble shooting step.

See the starter section of this thread for info!
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 05-06-2014, 10:21 AM   #69
hanna
Registered User
 
Join Date: May 2010
Location: USA
Posts: 359
My Ride: BMW 328i
Great thread! OP is helping a lot of people here. Needs to be a sticky and some of the other garbage needs to be "un-stickied".


Sent from BimmerApp mobile app
hanna is offline   Reply With Quote
Old 05-06-2014, 11:40 AM   #70
03-M3-Vert
Registered User
 
Join Date: Feb 2014
Location: Jax, FL
Posts: 22
My Ride: TiAg Convertible M3
Mine's an SMG, but the indicator follows the shift lever when moving in and out of gear.

What are your thoughts?


Sent from BimmerApp mobile app
__________________
'03 TiAg Cab

03-M3-Vert is offline   Reply With Quote
Old 05-06-2014, 02:19 PM   #71
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
No SMG expert here, but hood switch and salmon relay are two things to look into.

If those check out, back to diagnosing the starter.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 05-06-2014, 02:40 PM   #72
03-M3-Vert
Registered User
 
Join Date: Feb 2014
Location: Jax, FL
Posts: 22
My Ride: TiAg Convertible M3
Car has started several times via jumper-cable w/hood open.

I thought of the salmon relay, but the Chinese NAPA version wouldn't even register a gear selection, where the stock one consistently reports either 1st or "0" when moving the selector prior to starting attempts.

Tomorrow I will get back to the car & access the starter. I may give it the old "wrench-tap", but will definitely do a voltage check per above


Sent from BimmerApp mobile app
__________________
'03 TiAg Cab

03-M3-Vert is offline   Reply With Quote
Old 05-14-2014, 11:27 PM   #73
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
Any updates?
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 06-04-2014, 09:15 PM   #74
Mindspin311
Registered User
 
Join Date: May 2014
Location: Atlanta, GA
Posts: 82
My Ride: 2004 ZHP Sedan
Have a situation of my own. No start, no click from the starter. Tried both keys with no luck. All dash lights and headlights come on with no issue.

Used the OBC to get a voltage readout, 12.2-12.3v. I know the OP says 12.6, but is that small difference really enough?

Car is an 03 ZHP Sedan, 6spd.
Mindspin311 is offline   Reply With Quote
Old 06-05-2014, 08:00 AM   #75
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
The starter should crank with 12.2V.
You either have a bad starter, or there is no voltage on the signal wire (terminal B) due to a bad clutch switch, or ignition switch.
Check battery voltage at the starter to find out.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 06-05-2014, 08:01 AM   #76
Mindspin311
Registered User
 
Join Date: May 2014
Location: Atlanta, GA
Posts: 82
My Ride: 2004 ZHP Sedan
Quote:
Originally Posted by lszlszx View Post
The starter should crank with 12.2V.
You either have a bad starter, or there is no voltage on the signal wire (terminal B) due to a bad clutch switch, or ignition switch.
Check battery voltage at the starter to find out.
Thanks, looks like I can get access to the wiring from the top side, correct?
Mindspin311 is offline   Reply With Quote
Old 06-05-2014, 08:59 AM   #77
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
That's right, just remove the airbox.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 06-05-2014, 09:52 AM   #78
Mindspin311
Registered User
 
Join Date: May 2014
Location: Atlanta, GA
Posts: 82
My Ride: 2004 ZHP Sedan
Do I just touch the red on the multimeter to the specific terminal, the ground the other to the chassis somewhere?
Mindspin311 is offline   Reply With Quote
Old 06-05-2014, 10:17 AM   #79
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
That's correct, you'll need a helper to turn the key when you test the signal wire.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 06-05-2014, 06:05 PM   #80
Mindspin311
Registered User
 
Join Date: May 2014
Location: Atlanta, GA
Posts: 82
My Ride: 2004 ZHP Sedan
Quote:
Originally Posted by lszlszx View Post
That's correct, you'll need a helper to turn the key when you test the signal wire.
You say remove the "C" wire from the starter, is that necessary?
Mindspin311 is offline   Reply With Quote
Reply

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 11:02 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use