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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 08-27-2014, 01:03 AM   #1
Iggy27
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Join Date: Nov 2012
Location: Inkom
Posts: 507
My Ride: 2003 330xi
Weird starting problem help needed

Sometimes when I go to start my car in mid crank it will make a large thud noise as if something has got stuck. My question is could a weak battery cause this to happen? Or is it something else causing it to get stuck in mid crank? Couldn't find anything while researching for this problem
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Old 08-27-2014, 04:58 PM   #2
Iggy27
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Any tips?
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Old 08-29-2014, 05:52 AM   #3
Iggy27
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Anyone?
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Old 08-29-2014, 08:37 AM   #4
330XiNamedBif
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My Ride: 2005 330Xi 6-speed
What area do you think the sound is coming from? A couple things come to mind, but these are stabs in the dark with the info you provided.
1. How old are your engine mounts? Do you have the Seconday Air Pump impint on your hood insulation? Could the thud be the pump impacting the hood??
2. Since you have a 330 I believe there is a baffle in the exhaust system. Mine makes a mild squeak about 5 seconds after I shut the car off. I don't know if it opens durring start up, but maybe it is failing??

Give us as much information as you can and we will help you logic it through.
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2005 330Xi 6-speed with Sport, Cold Weather, and Premium Packages. Titanium Silver/ Black leather, myrtle wood interior trim.
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Old 08-29-2014, 09:30 AM   #5
Iggy27
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Engine mounts are most likely still original. Being replacing other parts at the moment never got around to them. The noise in defiantly from the engine bay. I'll try to take a video. The noise is pretty loud and sounds like metal on metal.
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Old 08-29-2014, 10:13 AM   #6
Iggy27
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Join Date: Nov 2012
Location: Inkom
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My Ride: 2003 330xi
Weird starting problem help needed

Ccv had cranks in the line and Iam changing that out next week. Engine wise that's the only defective thing I can think of. Would a old front axle with blown boots somehow cause this?

Last edited by Iggy27; 08-29-2014 at 10:21 AM.
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