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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 10-27-2012, 02:04 PM   #1
RCase
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Join Date: Jun 2004
Location: Normal, IL
Posts: 39
My Ride: 2001 325i Touring
Another "wont start" thread: Outcome

I recently encountered a classic "no start" situation where the vehicle would turnover, without any firing.

I searched exhaustively - and ended up with the conclusion that my original fuel pump of 106k miles was most likely the culprit, even though a voltimeter showed appropriate voltage, my fuel pressure on rail seemed fine et al. My relay was fine, although i switched it with the horn. All fuses were fine - however i checked them all (including the fuse in the engine bay), "kalim" threasd, etc. I disconnected the MAF, the thermostat and others, all found on threads.

Long story short - My key somehow lost its programming and the immobilizer was kicking in, not allowing the car to start. I accidentally grabbed the other key and the vehicle started right up. Tested with primary key - fail.

Long story short - as you are diagnosing the classic no start , try both keys as well.

THe good news - I proactively changed a problematic area with the vehicle. The car does idle slightly better in neutral now so I suspect that the fitler or something was not in ideal state.

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Old 10-27-2012, 02:49 PM   #2
Airborne82id
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Join Date: Oct 2012
Location: Los Angeles
Posts: 111
My Ride: 330CI
Thanks for sharing ...

We have a tendency to inquire about the problems we have but we neglect posting the culprit and the solution to the problem. Properly titled as well. Your post will help many members.

Last edited by Airborne82id; 10-27-2012 at 02:50 PM.
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Old 01-03-2013, 09:06 AM   #3
Sapote
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Join Date: Jan 2008
Location: southern California
Posts: 310
My Ride: E46 2000 323i wagon
Quote:
Originally Posted by RCase View Post
I recently encountered a classic "no start" situation where the vehicle would turnover, without any firing.

I searched exhaustively - and ended up with the conclusion that my original fuel pump of 106k miles was most likely the culprit, even though a voltimeter showed appropriate voltage, my fuel pressure on rail seemed fine et al. My relay was fine, although i switched it with the horn. All fuses were fine - however i checked them all (including the fuse in the engine bay), "kalim" threasd, etc. I disconnected the MAF, the thermostat and others, all found on threads.

Long story short - My key somehow lost its programming and the immobilizer was kicking in, not allowing the car to start. I accidentally grabbed the other key and the vehicle started right up. Tested with primary key - fail.
Today I'm having "engine cranked but not fired up" issue. Key immobilized issue??? I thought it should prevent the starter from cranking.

Question: immobilized issue allows starter to crank but would not let engine fire up?

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