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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 05-17-2015, 12:22 PM   #1
EA3DET
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E46 325 XI Hissing noise when preing the gas **Video included**

Hey Everyone,

I recently had a weird experience and wanted to know if anyone may have more insight. My wife and I where leaving a restaurant and she went to start the car as I Put the kids in the back. As i got out he yelled "whats that burning smell?", and is I headed to the front i looked back to see a cloud of white smoke coming from the exhaust. I immediately shut the car down and popped the hood. no smoke nothing suspicious so i said start it back up. and fired up and idled as normal. ran fine on the way home as if nothing was wrong. the the next morning it barely wanted to start and idled like it was struggling. I was able to drive it to a nearby autozone (5 blocks away) to get codes read and here is what they found.



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oddly after that I couldn't manually open my trunk anymore, I had to use the keypad????

Then I started to notice this strange hissing sound whenever I pressed the pedal. after doing research and not finding anything not relating to Break boosters, which I don't think this hissing is, I decided to do a video and post to see if anyone else has ran across anything similar?

Link to vid below

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Old 05-17-2015, 04:48 PM   #2
EA3DET
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bump
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Old 05-17-2015, 04:51 PM   #3
illuminated
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Judging by the video, that simply sounds like the butterfly valve in your exhaust opening and closing. If I remember correctly it opens at 2500 rpm, and is otherwise closed. You MAY have a vacuum leak on the lines that power this valve, but I can't say for sure. Is your car throwing any codes? And do you notice it having a *consistently* jumpy idle?
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Old 05-17-2015, 04:51 PM   #4
goosu94
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I had this issue a few months back. Make sure all of your air intake is connected tightly. I forget where mine was loose but it made the same sound and kept stalling.
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Old 05-17-2015, 05:11 PM   #5
EA3DET
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misfires due to fuel cut and jumping idle
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Old 05-17-2015, 05:12 PM   #6
Poolman
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Crankcase Vent Valve System---CCV
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Old 05-17-2015, 05:18 PM   #7
EA3DET
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Thats exactly what I was thinking but hoping t wasn't... lol
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Old 05-17-2015, 06:07 PM   #8
audiavant
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Could it be un-metered air getting sucked in ???
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Old 05-17-2015, 06:14 PM   #9
jfoj
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You need to read the first 2 links below in my signature.

Need to see Freeze Frame info if the SES/CEL/MIL is on and Fuel Trim values at both warm idle and a steady highway cruise between 45-60 MPH.

Read this thread - http://forum.e46fanatics.com/showthread.php?t=1057387

Make ABSOLUTELY sure the O2 sensor wiring has not been mixed up, read these links:

http://forum.e46fanatics.com/showpos...0&postcount=27

http://forum.e46fanatics.com/showpos...0&postcount=26

Read my "BMW 20 Questions" comments in this thread - http://forum.e46fanatics.com/showthread.php?t=1059972

Check for or be aware of cracked valve covers:

http://forum.e46fanatics.com/showthread.php?t=1021219

http://forum.e46fanatics.com/showthr...e=2&highlight=

http://forum.e46fanatics.com/showthread.php?t=1053359

Search YouTube for Scotty Smoke Test. Do what Scotty does or build a tester from related video. Remove the oil fill cap and make sure the crankcase fills up with smoke, put the oil fill cap back on and check for leaks around the valve cover, oil fill cap, dipstick tube and CCV hoses. Cracked valve covers are pretty common on the E46 as it ages.

Note that the Scotty Smoke Test method is not so good for smaller air/vacuum leaks or fully filling the engine crankcase, for this you really need a smoke machine that can provide a solid and continuous low pressure smoke stream. So plan on building a smoke tester of you thing you will use if more than once or may have smaller and harder to find leaks.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 05-17-2015, 06:43 PM   #10
illuminated
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ah, the guru jfoj has arrived
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lowered OG 5 speed 325xi

Excellent condition non-BMW family SUV for sale:
http://forum.e46fanatics.com/showthread.php?p=16694595

Dyslexic like George W. so work with me if you see a word that doesn't look right
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Old 05-20-2015, 07:14 PM   #11
EA3DET
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Hey Everyone,

Thanks for all the help! Just wanted to give an update as i have partially resolved my issue. I went to a local mechanic to see if they could do a smoke test to help me check for exhaust leaks. He said sure he could do that for $60 bucks and if i get anything fixed it will come off the price. This place was literally within walking distance of my house(as i live a few homes in from a main street), so I said go for it! Walked home, grabbed a beer, and waited for my phone to ring with a diagnosis.

A few hours later i get a call telling me to come up to the shop so he could show me what they found... I get there and the tech commenced his attempt to royaly screw me...

Tech: " Hey pal, your in bad shape! you have two bad coils... and since the coils are bad the spark plugs in those cylinders are bad (Which is true...) and you don't wanna just change two plugs (Which is also true...), you have to change them all!!!

Me: :" Yeah your right, but did you find any vacuum leaks?

Tech: "None" We just need to do the two coils and all the plugs and everything should be good"

Me: " Ok, what will that costs?

Tech: " Well that's a BMW!!! these parts aren't cheap. coil be $165 each and the plugs $20 each for that car you have to have the BMW grade plugs. I'll tell you what I'll do the whole job for $590 out the door. I gave you that deal and took of the $60 you paid for looking it over."

I don't know if just didn't here me when i dropped the car off and i told all the work i had done MYSELF already... oil filter housing, vanos lines, water pump pully's and belts, cooling system, VALVE COVER GASKET!!!

I just looked at him said "ill have to get a second opinion" and left....


Any way 2 coils, six Bosch +4, and 30 mins later ($186.48) Car is running superb!!!

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BUT....

The old plugs look SICK!!!


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Looks like i may still have to do the ccv and find that vacuum leak...

Any insight would be greatly appreciated
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Old 05-20-2015, 07:59 PM   #12
jfoj
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I have updated my basic comments recently to include checking the spark plugs. I always assume people would do the basics before diving into the deep end, but this assumption appears to be wrong more often than not.

I also have to remind people when they say things like the plugs were replaced 20k miles ago, you STILL need to pull and inspect them. Often people think they have only put 20k miles on the car and have more, or there is a problem where the plugs are getting fouled quickly.

You seen to think there is a vacuum leak. The shop did a smoke test? Did they actually find a problem. Do you really think there is a vacuum leak? What indicators (Fuel Trim Info) leads you to believe there is a vacuum leak?

Just hope you are not chasing your tail.

If the CCV is original, it likely needs to be replaced anyway, but also you have an XI and I am finding brake boosters on XI for some reason are failing around year 11-12.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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