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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 04-13-2017, 11:06 AM
KrankE46 KrankE46 is offline
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E46 intermittent starting issue

I have a 2004 325xi with 250,000 miles on it. 18 months ago it started to have an intermittent starting issue. typically it starts right up and runs as expected, once a day or sometimes more often it will turn over just as strong but won't fire up. If I turn the ignition off and pull the key out and wait 30 seconds to a min and try again it will usually start on the second or third attempt. I thought if I waited long enough the failing part would go out completely then I would know what to replace. Please let me know if anyone has had and resolved this issue. Thanks
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  #2  
Old 04-13-2017, 11:28 AM
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Fast Bob Fast Bob is offline
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Your fuel pump is quite likely failing at this point. Replacing it (and also the fuel filter) ASAP would be a good idea.
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Old 04-13-2017, 11:40 AM
KrankE46 KrankE46 is offline
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Thanks for your reply, I've look into replacing the fuel pump, cost at around $150.00. I would like to test the pressure at the fuel rail, do you know what that should be?
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Old 04-13-2017, 12:00 PM
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Fast Bob Fast Bob is offline
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Quote:
Originally Posted by KrankE46 View Post
Thanks for your reply, I've look into replacing the fuel pump, cost at around $150.00. I would like to test the pressure at the fuel rail, do you know what that should be?
~ 50 psi

It`s quite possible to have a "soft-fail" condition, where it doesn`t show up all the time.
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Old 04-14-2017, 06:38 AM
DEADF15H DEADF15H is offline
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Quote:
Originally Posted by Fast Bob View Post
~ 50 psi

It`s quite possible to have a "soft-fail" condition, where it doesn`t show up all the time.
^^^^^^This
Occasionally you can pull the seat up and tap on the top of the pump to get it going again. But that won't work for long.
Use a Siemens/VDO pump to replace. Easiest DIY ever, other than replacing a fuse.

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Old 06-16-2017, 02:18 PM
KrankE46 KrankE46 is offline
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I replaced the fuel pump and fuel filter. Still have the same issue, no change. Any other ideas on what could be causing the issue?
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Old 06-18-2017, 01:09 PM
Beardog Beardog is offline
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I have the same issue. Fuel pump, filter, and pressure regulator replaced a few months ago. Ignition switch may be next..

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Old 06-18-2017, 01:11 PM
Beardog Beardog is offline
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Mine starts like a champ, and then not at all! I left it overnight and it started up the next morning.

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Old 06-20-2017, 01:39 PM
KrankE46 KrankE46 is offline
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I have heard that starters have a sensor in them that tells the engine they are turning so the engine knows to fire. I've heard that bad spots can occur on the those sensors causing the engine to not fire during cranking. This causes what appears to be a completely random starting issue. Has anyone had this type of issue and resolved it by replacing the starter?

Any ideas would be helpful.
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Old 06-20-2017, 02:55 PM
scottjoh scottjoh is offline
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E46 intermittent starting issue

[QUOTE=KrankE46;10207427]I have heard that starters have a sensor in them that tells the engine they are turning so the engine knows to fire. /QUOTE]


I have never heard of such a thing. The engine uses the cam position sensors to determine engine RPM and current angle for when to fine. There is no sensor in the starter.
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Old 06-21-2017, 08:26 AM
KrankE46 KrankE46 is offline
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[QUOTE=scottjoh;10207562]
Quote:
Originally Posted by KrankE46 View Post
I have heard that starters have a sensor in them that tells the engine they are turning so the engine knows to fire. /QUOTE]


I have never heard of such a thing. The engine uses the cam position sensors to determine engine RPM and current angle for when to fine. There is no sensor in the starter.

Could a failing cam sensor cause a starting issue. What other sensors could cause the engine to not fire?
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