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General E46 Forum
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Old 12-04-2014, 02:11 AM   #1
shax91
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Starting problem!

Hey guys! I'm new to this so bear with me.. Here goes!
Last night I started having problems with my 318Ci. Every time I crank it it starts for about 2 seconds and then instantly dies again. I can't even rev the engine because it switches back off. Any else have the same problem or know what it could be? I have a feeling it could be the fuel pump but not sure.
How do I fix it? Please help! Thanks
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Old 12-05-2014, 05:26 PM   #2
latitude39
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Have you tested the fuel pressure?
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Old 12-05-2014, 05:30 PM   #3
shax91
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Sorry I'm kind of a newbie so I'm not sure how to check fuel pressure..
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Old 12-05-2014, 09:24 PM   #4
lszlszx
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Watch this video:


It is very likely a fuel pump problem.
You can also just poke the schraeder valve after the engine stalls.
If the pressure is good, gas will spray out quickly, so be careful!
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Old 12-14-2014, 05:38 AM   #5
Tyler330xi
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I had the same issue. It was the crank postioning sensor.
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Old 12-14-2014, 06:55 AM   #6
shax91
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I've changed the fuel pump and that sorted the problem but now it's come up with another issue where it takes ages to start. It cranks for so long and then starts up
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Old 12-14-2014, 07:13 AM   #7
Tyler330xi
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Its you're crankshaft positioning sensor.
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Old 12-14-2014, 07:15 AM   #8
shax91
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100% it's the crankshaft positioning sensor? I thought it may have been the mass air flow sensor since its drinking so much fuel
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Old 12-14-2014, 08:59 AM   #9
Tyler330xi
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Mine did the same thing. It would just crank crank crank..... and once in a while it would start for 2 seconds and die. Then keep cranking again. Hooked my laptop to it as I was cranking and it was the crank shaft positioning sensor. Im 99 percent sure thats what youre problem is.


Your MAF senson usually wouldn't effect it starting. Just after it started it would rough idle or stall out.



Also. When purchasing MAF sensons if you have a bmw dealership in your area get the sensor from them. Autozone and other cheap autopart stores occasionally has faulty sensors.
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Old 12-14-2014, 09:01 AM   #10
shax91
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Cheers mate I appreciate your help.
I shall try cleaning the current sensor first and see if it helps with the juddering and in the mean time get a new crankshaft sensor fitted on.
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Old 12-14-2014, 09:04 AM   #11
Tyler330xi
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Glad I could help bud. Hope you have an easy experience.
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Old 12-14-2014, 10:15 AM   #12
jfoj
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Before you jump on the crank sensor, watch the tach carefully while you crank the engine. It should display about 100 RPM and be pretty stable, if it is, then the crank sensor is no likely a problem.

See this video - https://www.dropbox.com/s/k7tmin8qek...4_056.mp4?dl=0

I would say if the crank sensor is good, which it likely is, then the intake cam sensor, ignition switch or a fuel related issue is still causing issues.

Intake cam sensor would be a very likely problem.

Fuel issue can be ruled out with Starting Fluid.
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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

Last edited by jfoj; 12-14-2014 at 10:18 AM.
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