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Old 06-27-2007, 07:58 PM   #1
Redster
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I have to ask now - Re: head gasket?

It's '99 540i, and yesterday after driving from Kitchener to Toronto there was strange noise coming from under the hood, sounded like one of the bearings was seizing and the belt was making the noise at all times except when accelerating. When idling car would shake a bit.

Today my mechanic replaced two bearings but the noise was still there (even though they had to be replaced anyway). When we started the car it was misfiring and would choke & die. That's when he removed the oil dipstick and it was like a vacuum - engine was sucking air in.

What's your guess as to what could cause this? Head gasket? Crank case vent? Something third..?

I ask because car is sitting there until Tuesday when he'll work on it..
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Old 06-28-2007, 12:49 AM   #2
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Nobody?
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Old 06-28-2007, 01:28 AM   #3
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Its normal to have vacume when removing the dipstick...thats why it runs like $hit if you forget to put it on! (or the oil cap too)...

There should be MANY other indications of headgasket problems (air in coolant, smoke in exhaust, mixing oil/coolant, overheating...)
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Old 06-28-2007, 04:33 AM   #4
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I am not too sure about the air being sucked in by the dipstick but if you have coils per cylinder i would check those. Have you checked your plugs? my bet is that one of them is wet!
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Old 06-28-2007, 08:44 AM   #5
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Old School headgasket check: When the engine is cold remove the rad cap, start the car up and if you see air bubbles emerge in the rad; if they do the head gasket is on it's way out.

OR

Do an oil change and send the oil for a used oil analysis? If there is coolant present in the oil, the headgasket may be damaged.

As Fil said the vacume when the dip stick or oil cap is removed is normal.
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Old 06-28-2007, 09:21 AM   #6
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Quote:
Originally Posted by Mikeee46coup
Old School headgasket check: When the engine is cold remove the rad cap, start the car up and if you see air bubbles emerge in the rad; if they do the head gasket is on it's way out.

OR

Do an oil change and send the oil for a used oil analysis? If there is coolant present in the oil, the headgasket may be damaged.

As Fil said the vacume when the dip stick or oil cap is removed is normal.

That is a bit more complecated...try this:
Check both coolant and oil level. If the oil has a brownish soapy look then its a gasket. Same applies for your coolant.
If your temperature reads high really quickly it is also a sign.
As i said though my guess is an electrical or fuelling problem. Most likely electrical so check your sparks plugs and tell us what colour they are. Are they wet? are they white or do they look ok?
In the worst case scenario you are looking at a new piston. But i doubt its the headgasket.
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Old 06-28-2007, 09:23 AM   #7
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One more thing....did you check your timing belt/chain tensioner? Ity could also mean that it jumped a tooth. I am asking because you said the whine is more intense when idling. Could your belt/chain be loose?
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Old 06-28-2007, 09:51 AM   #8
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The thing is that unless you remove the dipstick car would choke and die. There is a bit of smoke too.

What exactly does crank case vent do?

As far as the noise/whine, it's there at all times except when accelerating and it's gone only as long as you keep pressing down the gas pedal.
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Old 06-28-2007, 10:44 AM   #9
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It does what it says....Vents the Crankshaft.
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Old 06-28-2007, 10:46 AM   #10
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Quote:
Originally Posted by Redster
The thing is that unless you remove the dipstick car would choke and die. There is a bit of smoke too.

What exactly does crank case vent do?

As far as the noise/whine, it's there at all times except when accelerating and it's gone only as long as you keep pressing down the gas pedal.

In my eyes it could be allot of things.
Seizing water pump...the crank vent....or bad timing. But it dont sound like a blown head gasket.
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Old 06-28-2007, 03:55 PM   #11
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when the water pump is gone, it makes that screetching noise, sort of like cracked belt sound. check it first, if the headgasket isnt blown and you leave the car like that soon it will overheat and damage the gasket. Just check the water pump first.
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Old 06-28-2007, 05:45 PM   #12
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Quote:
Originally Posted by mpower1226
when the water pump is gone, it makes that screetching noise, sort of like cracked belt sound. check it first, if the headgasket isnt blown and you leave the car like that soon it will overheat and damage the gasket. Just check the water pump first.
I don't think it's water pump because I drove 250km in 41C weather and car never overheated..

I talked to the mechanic today and he'll check all those things before taking the engine apart but I have to wait till after the long weekend to find out what's the problem.
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Old 06-28-2007, 08:00 PM   #13
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Dude, you're already at the mechanic. It's his job, let him figure it out wtf, then tell us what it was.
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Old 06-28-2007, 09:14 PM   #14
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Quote:
Originally Posted by Flav_cool
Dude, you're already at the mechanic. It's his job, let him figure it out wtf, then tell us what it was.
Curious by nature..and very impatient.
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Old 06-28-2007, 10:52 PM   #15
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why does your mechanic take so look to look into this?

go somewhere else....
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