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Old 11-02-2011, 11:55 AM   #1
Manitron05
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BMW E46 Urgent help

Hi guys

I'm going to quickly breakdown the problem. At first my car could beep then all the warning lights would come on. The problem persisted so i took it to a diagnostic and it was identified as a camshaft and crankshaft sensor problem. I changed the 2 camshaft sensors and for a while the problem was gone. And then the problem came back so i bought the crankshaft sensor and had it changed since it quite a tough job. It was changed and all the errors were cleared. A new problem started the car now shudders and doesn't idle smoothly. The guys told me they thought it was an alternator so they got a new alternator, changed it then guess what same problem so heres a video. Help please!!!

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Old 11-02-2011, 11:59 AM   #2
jasonbimmer
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I am smelling a vacuum leak
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Old 11-02-2011, 12:02 PM   #3
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^ what he said, its probably a torn intake boot, i had that happen on mine when i changed my CCV and couldnt figure it out, then i started taking of the intake tube and saw a huge crack in the intake boot. check that
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Old 11-02-2011, 12:11 PM   #4
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I havent had my beemer for long so i dont know a lot whats a Vacuum leak? @jasonbimmer. And dmitrofed whats a torn intake boot
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Old 11-02-2011, 12:11 PM   #5
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Yeah, I don't believe it's an alternator causing that issue. If it was, your car would be a lot more screwy than a single warning light flashing at a certain RPM.
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Old 11-02-2011, 12:15 PM   #6
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LOL @ video!

Some people pay thousands for their car to do that!
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Old 11-02-2011, 12:16 PM   #7
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Quote:
Originally Posted by Manitron05 View Post
I havent had my beemer for long so i dont know a lot whats a Vacuum leak? @jasonbimmer. And dmitrofed whats a torn intake boot
Someone needs to take mechanics 101.
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Old 11-02-2011, 12:19 PM   #8
Manitron05
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Originally Posted by newe46fan View Post
Someone needs to take mechanics 101.
I just dont know much about beemers, i know what an intake boot is now but i doubt thats the problem, so now i need to look into this vacuum leak
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Old 11-02-2011, 12:23 PM   #9
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Originally Posted by Manitron05 View Post
I just dont know much about beemers, i know what an intake boot is now but i doubt thats the problem, so now i need to look into this vacuum leak
lol

I would suggest you do this to your camshaft and crank sensors and all sensors.

http://forum.e46fanatics.com/showthr...781&highlight=
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Last edited by new//M3fan; 11-02-2011 at 12:24 PM.
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Old 11-02-2011, 12:26 PM   #10
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Here's one thing i forgot to mention, theres a sinister oil leak and i dont know where its coming from is this the vacuum leak?
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Old 11-02-2011, 12:27 PM   #11
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Originally Posted by Manitron05 View Post
Here's one thing i forgot to mention, theres a sinister oil leak and i dont know where its coming from is this the vacuum leak?
lol

OP is trollin!

Unintentionally at least.
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Old 11-02-2011, 12:49 PM   #12
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a vacuum leak is any unmetered air entering the engine, so its whatever isnt measured by the mass air flow sensor. the intake boot has ribs on it and it could easily be cracked on one of them, it takes a few minutes to check, and will at least eliminate that possibility, my suggestion is if you dont have much experience fixing cars then dont screw with anything but just take it to a shop. itll be cheaper than throwing parts at it.
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Old 11-02-2011, 12:53 PM   #13
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The vacuum leak is probably under the oil cap; it's a common problem on these cars. All you need to do is unscrew it, stuff a sock or something down in there, and screw it back on.

Ok, seriously though, don't do that. I'd take it to another mechanic, one who isn't going to throw parts at a problem they can't diagnose. I'm not sure you should be trying to fix this yourself--it is likely that you're going to do more harm than good to your "beemer" if you open the hood without supervision.

Does the same thing occur when the car is under load? Ie, not just when revving up in park? It seems like it could be a vac leak, or some problem with fuel/spark delivery. Fuel filter, maybe?
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Old 11-02-2011, 01:15 PM   #14
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Originally Posted by lcoleman View Post
The vacuum leak is probably under the oil cap; it's a common problem on these cars. All you need to do is unscrew it, stuff a sock or something down in there, and screw it back on.

Ok, seriously though, don't do that. I'd take it to another mechanic, one who isn't going to throw parts at a problem they can't diagnose. I'm not sure you should be trying to fix this yourself--it is likely that you're going to do more harm than good to your "beemer" if you open the hood without supervision.

Does the same thing occur when the car is under load? Ie, not just when revving up in park? It seems like it could be a vac leak, or some problem with fuel/spark delivery. Fuel filter, maybe?
Well the thing is im not totally daft with cars i mean ive changed a Peugeot 306 engine on my own but thats a huge jump to a BMW with an engine layout, components and parts you have never seen before, I have the tools and thats why i changed the camshaft sensors on my own but im out of my depth with BMW way out. I've never owned one so as you can imagine this is a huge step up.

Anyway back to the subject when i bought this car it hadn't moved for about 6 months, there was no leak no nothing, now theres a leak on the car and occasionally i smell oil. through the research i've done ive come across something with the Vanos?? whats this about?? Anyway if the car is movinng if i accelerate hard it does exactly whats in the video so above 2-3k rpm it does that. The problem has changed from the original problem. It used to be a beep then it would shut down and all warning lights come on. Then when i changed the 2 cam sensors it was fine for about 3 days then it would start acting up when it gets warm. Then i had the crank sensor changed now it does whats in the video and theres a really fresh looking oil leak. SO the problems eliminated (2camshaft sensors, crankshaft sensor, alternator).
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Old 11-02-2011, 01:33 PM   #15
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Engine swaps, but don't know what a vacuum leak is? Perhaps they call it something different across the pond.

Sitting for 6 months makes me suspect the fuel system any more. If you guys have an ethanol blend like we have over here, it can wreak havoc on lines, pump, filters, injectors, etc. when it sits in there for a while.

Does it still do it only when warm? No CEL codes have been thrown thus far, right?

The oil leak is in 99% likelihood unrelated to your issue, but still needs to be fixed. Probably the valve cover gasket.
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Old 11-02-2011, 01:33 PM   #16
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Quote:
Originally Posted by Manitron05 View Post
I havent had my beemer for long so i dont know a lot whats a Vacuum leak? @jasonbimmer. And dmitrofed whats a torn intake boot
vacuum leak is when engine sucks more air than the sensors read.
on E46, there are several places can cause vacuum leak:
VCG
Oil Cap
Dipstick
CCV
Intake boot
and many many old and rotten vacuum hoses
start checking these.
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Old 11-02-2011, 02:32 PM   #17
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if you are this clueless about bmws I recommend you seek a good mechanic and not waste time. I dont think a vaccum leak is called anything else in the rest of the world. I seriously cant believe you've done engine swaps on peugeots.
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Old 11-02-2011, 02:51 PM   #18
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if you are this clueless about bmws I recommend you seek a good mechanic and not waste time. I dont think a vaccum leak is called anything else in the rest of the world. I seriously cant believe you've done engine swaps on peugeots.
An engine swap on a 1997 Pug doesn't take a science degree I know I sounded dumb but I get what everyone means by a vacuum leak but I didn't know what areas can leak. The thing is I've heard about 10 possible solutions to the problem and it's taking me in circles. I'm grateful for the help tho I mean I didn't even get a reply from another rival site where I have withdrawn my membership. I'm just going to take it to my local BMW dealership for a check because the local garage I'm using they have no clue
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Old 11-02-2011, 02:57 PM   #19
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No way a vacuum leak will cause that!!! Notice how smooth the idle went down and stayed down with his foot off the gas. I would check all battery connections, also check connections at the alternator. The reason your batt light is on is because voltage has either dropped below spec or above. In this case it may be above since it happens at high rpms. A alt putting out more than recommended voltage will ruin your cars electronics and even damage your headlights. Good luck
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Old 11-04-2011, 07:49 AM   #20
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Thought i'd update on this, i took my car to my local Vines BMW and they said the problem is with the crankshaft sensor (the same sensor i had changed a few days ago) and the Alternator apparently is acting up too (the same alternator i also had changed)

SO my question is do i need OEM sensors and alternators because i'm kinda stuck? Apparently the leak is the rocker cover gasket
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