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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 06-25-2012, 05:19 AM   #1
SuperhitsBMW
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Join Date: Feb 2011
Location: Hampshire
Posts: 8
My Ride: 318ci Coupe 2.0
2001 318ci m42 cold start problem. - see YouTube video!

My 318ci has trouble starting from cold.

Itll start, die, then have the problem shown in the video.



Will start if I persist but will run on 2 cylinders, then 3 then eventually 4 when it's warm. Once warm, she runs beautifully. These problems seem to have started after I changed the battery?

It's LPG converted,

143,000 miles
I have had the coils, plugs, O2 sensor, and cam shaft sensors done but to no avail.

Has a fault when plugged in, so we changed the O2 sensor accordingly but still happening.

Any ideas would be greatly appreciated!

Best

Alex
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Old 07-30-2012, 09:08 AM   #2
SuperhitsBMW
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Anyone?
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Old 05-25-2015, 05:33 AM   #3
Grantos
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Join Date: May 2015
Location: Newport
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My Ride: BMW 318Ci
Hi, did you ever solve this issue I'm getting exactly the same problem?
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Old 05-25-2015, 08:31 AM   #4
djdonis
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Join Date: May 2009
Location: Charlotte
Posts: 393
My Ride: 330i 6sp, 330i 5sp
Check your fuel pump.

A car engine depends on two systems - fuel delivery and ignition. You either get no fuel or no spark. BMW are not really known for ignition system problems, but fuel pump failures are pretty common.
Also check vacuum lines on the "F" connector that run from the intake boot, one of them runs to the fuel filter...
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Old 05-25-2015, 10:06 AM   #5
Grantos
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Hi thanks for the input, I should have mentioned I am a mechanic, specialise in VAG group but drive BMWs lol. The fuel pump is fine, the vehicle will eventually start after much starter motor cranking horror. It over fuels which seems to be the problem, it starts immediately and then dies on the first go. Then upon the second crank its injected that much fuel its washed the bores and has no compression. There are no fault codes, I've tried little things like unplugging maf, coolant temp sender. Can't see any evidence of problems looking at live data! Just a bit lost at present to be honest!
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Old 08-25-2015, 06:11 AM   #6
Grantos
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Anyone, it seems to have been pretty good in the hot weather but this morning did it again.
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Old 08-25-2015, 06:42 AM   #7
jfoj
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My Ride: 330CiC, M5, X5
I will hold my tongue as much as I can here.

What you are experiencing is Misfire with Fuel Cut Off, which shuts down the fuel injectors for the misfiring cylinders for a period of time while the engine is running to protect the Catalytic Converters. Once the engine has run long enough the Fuel Cut Off is removed and the engine will start to run smoother. Another way to bypass or fool the DME is to turn the engine off for 10+ seconds and restart it, this often can and will clear the Fuel Cut Off.

Coils were fine, O2 sensors has nothing to do with immediate cold start.

Cam sensors clearly did not help matters and probably did not need to be replaced.

So you claim you know the fuel pump is not the problem, what did you do to rule out the fuel pump. I can tell you there is not an E series BWM on the planet that should still have the original fuel pump in the fuel tank IMHO.

Additionally, did you test the replacement battery? Have you checked the cranking Voltage with a meter on Minimum hold? If the cranking Voltage drops too low, the DME will not fire the spark plugs multiple times during each trigger event.

Additionally have you smoke tested the engine and crankcase to look for vacuum leaks?

Have you removed and inspected the DISA?

You may want to read this thread - http://forum.e46fanatics.com/showthread.php?p=16727145

What you are experiencing is Misfire with Fuel Cut Off, which shuts down the fuel injectors for the misfiring cylinders for a period of time while the engine is running to protect the Catalytic Converters. Once the engine has run long enough the Fuel Cut Off is removed and the engine will start to run smoother. Another way to bypass or fool the DME is to turn the engine off for 10+ seconds and restart it, this often can and will clear the Fuel Cut Off.

Suggest you spend more time on diagnostics and thinking and less time on random parts replacement.
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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, 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
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Old Today, 08:42 AM   #8
Grantos
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The strange thing is it got better for quite a while and only the past week or so it's gotten worse again. It did cut out on me once when there was about 1/4 tank left on the gauge and when I opened up the tank the pump side was dry and the other had fuel. With that in mind I replaced the fuel pump Friday. Now it seems to drive a bit better when running, but the fault is still there, I'm currently sat in a car park waiting for someone to come jump start me. It started first thing this morning but now it cranks and cranks with the odds splutter of life the dies! I'm beginning to hate this car!
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