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  #1  
Old 01-28-2025, 08:19 PM
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N62, electric ignition, turns over, won's catch/start

Hi all,
has anyone here had the issue where their electronic (turn key and let go) ignition system will crank powerfully but just never catch the engine dn turn it over? It has been happenning more and more lately and when it does. I let it occur for about 3 seconds, then I turn off key, then on second attempt, every time, the N62 fires RIGHT up loud and proud.
I've replaced the fuel filter about 50k kms ago and use premium only gasoline and even seafoam in the fuel tank about every 5th fill just to keep the injectors adn fuel system as clean as possible.
No, I've never replaced the fuel injectors.

Since its not an every day occurance with the e53, I can't really bring it into a mech and ask for him to diagnose, becasue we all know if I did that, the problem would never occur whilst the X5 is in their shop.

If anyone has had this issue, did you resolve it, and if so, what was your remedy?

this is the only issue my beautiful 270k km N60B44 has currently and I'd love to resolve it.
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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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  #2  
Old 01-28-2025, 09:07 PM
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Symptom of fuel pressure problem.

I've seen this when the FPR fails which you've said replaced in a time frame that would not have failed but that is the most likely candidate.

Checking fuel pressure after engine off for example overnight it should still be 20-30#.

When wife's FPR failed, the psi would jiggle not stay steady.

The next most likely candidate is fuel pump. When they fail, it's a slow process that's masked by the FPR doing it's job.

On the v8s with "convenience start" that I've worked on, the fuel pump doesn't kick on at key on like the 3.0 models only once you turn to the start position so it's relying on some reserve pressure from the last drive.

If you have a scanner that can force the pump on you can prime the fuel rail before you crank to help diagnose.

You can use a cheap "throw away" tire pressure gauge for simple read of pressure overnight (in my testing this works for one session/day, it kills the guts and stops working) but for $1 dollar store gauge it works.

"Feels" like you'll be able to trace the problem within a few tests.
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Old 01-30-2025, 12:44 AM
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I replaced my OE fuel pump a few years back after the OE pump's fuel level sender was acting up. Not the pump per SE but just the level sender.
I still have the OE fuel pump...maybe I should swap it back in to see what happens

Thanks for your feedback.


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__________________
I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

_______________________
'91 850i
'05 X5 4.4i
'09 Clubman S

Last edited by Clockwork; 01-30-2025 at 12:57 AM.
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Old 01-30-2025, 06:51 AM
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I'd measure first. Also: fuel pumps last an average of 5000 hours. How's old was the original?
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Old 01-30-2025, 11:02 AM
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Quote:
Originally Posted by andrewwynn View Post
I'd measure first. Also: fuel pumps last an average of 5000 hours. How's old was the original?
200k KMS I want to say...

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__________________
I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

_______________________
'91 850i
'05 X5 4.4i
'09 Clubman S
Reply With Quote
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