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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Apr-23-2012, 06:15:18 PM   #1
MSpeedAddict
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Default Another noise thread...engine ping/idle dip?

So this only has happened to me twice (two separate drives), both times in the last two months.

Basically at idle I'll get a ping ping followed by an idle dip, then repeat. If I gently touch the throttle and keep the RPM at 1-1.1k rpms it completely stops, and car drives perfectly otherwise.

It's only happened after the car has been fully warmed up, and usually after Around a 1/2 hour drive.

No codes being thrown, and I'll have access to DIS, etc this week when my cable comes in.

Any thoughts on what I should check?

It's rather intermittent when it's happening and has only happened twice during two drives. I tried to get my phone out to record it but didn't get anything useful.

Also - MIGHT have a vacuum leak, because occasionally the idle oscillates.
That said, I did have a full smoke test with all leak fixed at the end of last summer.

Edit: oil level is 1/16" below full line

Last edited by MSpeedAddict; Mon, Apr-23-2012 at 07:13:29 PM.
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Old Mon, Apr-23-2012, 11:47:54 PM   #2
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Default Re: Another noise thread...engine ping/idle dip?

Anyone?
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Old Tue, Apr-24-2012, 05:01:06 PM   #3
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Default Re: Another noise thread...engine ping/idle dip?

Well...TTT
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Old Tue, Apr-24-2012, 06:06:16 PM   #4
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Default Re: Another noise thread...engine ping/idle dip?

winter-summer gas switch? Or bad gas?

dirty maf or air filter?
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Old Tue, Apr-24-2012, 06:20:11 PM   #5
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Default Re: Another noise thread...engine ping/idle dip?

Quote:
Originally Posted by Foo2rama View Post
winter-summer gas switch? Or bad gas?

dirty maf or air filter?
What is winter-summer gas switch?
I'm not familiar with this.

Bad gas, slight possibility, both times I went to a Turkey Hill, although different stations.

I'm alpha-N, and air filter is new last summer.

Thanks for the suggestions, any more keep em coming
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Old Wed, Apr-25-2012, 05:30:50 PM   #6
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Default

TTT....
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Old Wed, Apr-25-2012, 06:43:08 PM   #7
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Default Re: Another noise thread...engine ping/idle dip?

I had this problem, changed plugs and problem solved.
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Old Wed, Apr-25-2012, 06:46:53 PM   #8
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Default

Quote:
Originally Posted by fatcat View Post
I had this problem, changed plugs and problem solved.
Really?!
I'm definitely going to check my plugs, thanks!

We're they obviously visually bad? Or did you just change them
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Old Thu, Apr-26-2012, 12:57:18 AM   #9
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Default Re: Another noise thread...engine ping/idle dip?

They were worn, 56k miles on original plugs. Car ran smoother and faster!
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Old Thu, Apr-26-2012, 02:35:23 AM   #10
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Default Re: Another noise thread...engine ping/idle dip?

Cool, I called Active and ordered IXU27 (NGK DCPR9EIX) just have to gap them to .023.
Thanks! I hope it works.
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Discussing Another noise thread...engine ping/idle dip? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)