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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!

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Old 11-14-2013, 01:59 AM   #1
Brownbryce
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Cold start problems.

My e46 325ci automatic. has trouble starting when cold, it cuts out, then ticks over really low, so when you put it in drive it stalls. ???


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Old 11-14-2013, 03:38 AM   #2
NumbaOneNewb
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Cold start problems.

Try disconnecting maf sensor an starting it. See if that helps. If it doesn't you have a vacuum leak
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Old 11-14-2013, 06:17 AM   #3
jfoj
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Read the 1st link below in my signature.

Unplugging the MAF sensor actually causes the engine to run a bit richer, so if unplugging the MAF sensor makes the engine run better you likely have vacuum leaks, but this test may be misleading anyway.

Suggest you purchase your own OBDII scan tool. For $30 USD or less you can have a tool that does what you need, read this - http://forum.e46fanatics.com/showthread.php?t=967204
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 11-14-2013, 08:51 AM   #4
Brownbryce
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Join Date: Aug 2013
Location: Uk
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My Ride: E46 325ci
Cold start problems.

Hi I have a eobd reader. The codes are 227 228. I've replaced the maf, both engine temp sensors, cyclone valve, fuel pump, idle valve, it's turning in to a money pit lol.


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Old 11-14-2013, 09:19 AM   #5
lszlszx
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Does you code reader display fuel trims?
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Old 11-14-2013, 10:14 AM   #6
jfoj
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Intake boots and DISA O-ring at a minimum should be considered.

Cracked/leaking valve cover gasket.

Not sure why you replaced the MAF, hopefully you still have the orignal one, hold on to it!

$30 USD or less, you need to read this - http://forum.e46fanatics.com/showthread.php?t=967204
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 11-14-2013, 11:53 AM   #7
Brownbryce
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Cold start problems.

What does the disa valve do?


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Old 11-14-2013, 11:55 AM   #8
Brownbryce
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Cold start problems.

Intake pipes all good. It does have a flat spot, but I can't find an air leak.


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Old 11-14-2013, 12:08 PM   #9
jfoj
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Quote:
Originally Posted by Brownbryce View Post
What does the disa valve do?
Leak air around the large O-ring and -
Attached Files
File Type: pdf DISA Operation.pdf (164.0 KB, 26 views)
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 11-14-2013, 11:57 PM   #10
Brownbryce
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Location: Uk
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Cold start problems.

Of the fuel tank leaked around the fuel pump seal could this be my problem? I filled the tank right up, and noticed petrol on the floor. Looked under the car and the tank is wet with fuel it's coming from the top of the tank. !


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Old 11-14-2013, 11:58 PM   #11
Brownbryce
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Cold start problems.

If the fuel !!!


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Old 11-15-2013, 12:49 AM   #12
heechkass
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Cold start problems.

Seems like a good starting point. So are you saying, fuel leaked out and onto the back seat and floor?


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Old 11-15-2013, 01:58 AM   #13
Brownbryce
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Cold start problems.

Yes.


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Old 11-15-2013, 06:25 AM   #14
jfoj
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Either the hose on the fuel sender is leaking or someone removed the fuel pump and did not reinstall the fuel pump/sender gasket correctly.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 11-15-2013, 07:19 AM   #15
Brownbryce
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Cold start problems.

Will that effect the fuel pressure?


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Old 11-15-2013, 07:31 AM   #16
jfoj
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If the fuel line clamp is loose, it can impact fuel pressure.

Suggest you pull the rear seat bottom, very easy, no tools needed, pull up sharply on front corner of seat bottom.

The on the right rear (your drivers side) check the insulation to see if it is cut, this will give you and idea if someone has been under the seat to access the pump. You can then pick up the insulation and remove the 3-4 screws to access the fuel sender. On the access panel is removed you will be able to see the fuel hose and determine if this is leaking.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 11-15-2013, 07:40 AM   #17
Brownbryce
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Join Date: Aug 2013
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Cold start problems.

Ok many thanks will keep you posted.


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Old 11-15-2013, 08:02 AM   #18
jfoj
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Personally I think the fuel leak may not be the main cause of the cold start problems.

You really need an OBDII scan tool as I mentioned before so you can see more data and understand better what is going on.

Next read and follow the lead in the 1st link in my signature.

Fuel pump info is in the 2nd link in my signature.

You cannot see signatures on smartphones with Apps. Log on an use a computer to see the signatures.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 11-15-2013, 08:39 AM   #19
Brownbryce
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Join Date: Aug 2013
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Cold start problems.

Ok. Took seat out dry as a bone! Can't see where the fuel leaking From need to put car on a ramp. The fault codes says it could be up to 8 different things! Slowly working through them lol.


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Old 11-15-2013, 08:41 AM   #20
David McMahon
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Quote:
Originally Posted by Brownbryce View Post
Ok. Took seat out dry as a bone! Can't see where the fuel leaking From need to put car on a ramp. The fault codes says it could be up to 8 different things! Slowly working through them lol.


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List! Then maybe clear codes then... LIST!! Please
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