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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 02-10-2013, 06:52 AM
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Studawg Studawg is offline
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Mein Auto: 2003 540iT M Sport
M62TU rough cold idle vacuum leak fixed!

In the past couple of months, there have been a few times when it would crank up then immediately die. Most of the time, it would crank, stay running, but immediately just start a wump, wump, wump type of idle. Then most recently, it would crank, and idle ok, (only ok), but then after about 45 seconds, when the engine drops down to normal idle speed, it would start the wumps.

It would take about 15 minutes of driving before this went away. At a stoplight, while in gear, if you went to creep up a little, the car would surge forward with the wumpy idle. I was getting codes 1c, 1d, etc.... for multiple misfires, and lean bank idle codes.

A few weeks ago, I replaced the CCV, but that didnt help. A couple weeks later, I loosened and retorqued the intake manifold bolts, that might have made a LITTLE difference, but not much. I then received the throttle body gasket and spacer gasket; a round one that goes from the TB to the spacer, or "flange" as its called, and another one that goes between flange and intake manifold. It was this gasket, the one between flange and IM that I think was the main culprit. It looks identical to the one for the CCV. Most of it came out in one piece with some needle nose pliers, but then the lower left corner broke off. I had to dig that out of the recess in the intake. The gasket was very brittle and hard all the way around and would break apart into small pieces.

This morning was the real test. I went out and cranked it up and immediately thought good things. But I waited to see what it would do when the idle speed drops about 45 sec. in. Fingers crossed, it dropped down and just purred like a kitten at around 500 rpm. :redspot:buttrock:alright

NOW THIS ALL COMES AFTER I TOOK IT TO AN BMW INDY, PAID THEM TO DO A SMOKE TEST, WHICH THEY WOULDNT LET ME WITNESS, THEN SAID IT HAS MULTIPLE VACCUM LEAKS, AND THE INTAKE NEEDS TO COME OFF, ETC....AND IT WILL BE ABOUT $1000.

(This is where I go into a rant comparing the odds of finding a mechanic that is both honest and competent with that of the lottery.)

These 2 gaskets cost me $23 and about an hour. And most of that time was spent letting the engine cool off. I just wanted to be sure I covered all my bases before taking the manifold off. And who knows, maybe my manifold gaskets will be leaking soon, but why take it off when you dont have to?

If you have a vacuum leak, or any of the symptoms I mentioned, and you have a M62 or M62TU, try replacing the TB flange-to-manifold gasket.
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  #2  
Old 02-10-2013, 08:25 AM
Dackelone Dackelone is offline
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thanks for posting.
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  #3  
Old 02-10-2013, 12:36 PM
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Studawg Studawg is offline
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Mein Auto: 2003 540iT M Sport
No problem, hope it helps somebody out. Thanks to the forum.
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  #4  
Old 02-10-2013, 04:30 PM
edjack edjack is offline
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Mein Auto: '97 540i 6 speed
www.bimrs.org, local BMW CCA chapter for a recommended wrench.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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  #5  
Old 02-13-2013, 09:59 PM
ian@jewelorjalopy ian@jewelorjalopy is offline
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Mein Auto: 2000 540it Sport - sold
Glad the procedure worked for you! Here's the original procedure from a year ago...

http://forums.bimmerforums.com/forum/showthread.php?t=1775480&highlight=intake+leak
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  #6  
Old 02-14-2013, 05:41 AM
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Studawg Studawg is offline
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Mein Auto: 2003 540iT M Sport
Quote:
Originally Posted by edjack View Post
www.bimrs.org, local BMW CCA chapter for a recommended wrench.
Thanks ed, I was glas to see that the shop I took mine to was not on there. Closest one to me on that site is 79 miles away, which I deem to be a good sign, considering there are several BMW shops near me.

I actually took my car to the BMW dealer an hour away rather than the one here in town just to get my new windhsield put in!
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