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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 04-24-2012, 07:53 PM
Killybeys Killybeys is offline
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Exclamation Sucking noise made when gas is pressed

I have a 1993 325i and whenever i press the gas there is a delay in the accleration and it makes a sucking noise in the engine. It even makes the idle dip down slightly, about 200-300 rpm and its a manual so this is an annoying problem when trying to take off. Any help would be appriciated. i know it sounds like a vacuum leak but i have tried to find the leak with carbeurator cleaner and i cant find anything. Thanks
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  #2  
Old 04-24-2012, 08:04 PM
Killybeys Killybeys is offline
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Ive also replaced the Idle control valve because i took it to a bmw shop and they said it might help, and that hasnt done anything. ive been searching for answers for months.
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  #3  
Old 04-24-2012, 09:51 PM
RhymeGrime RhymeGrime is offline
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Check the intake boot for any cracks and make sure the O-Ring that connects the intake Tube (Or stock airbox if you're using that) to the MAF is still intact and in good condition. Report back for further diagnostics, I think you're on the right track about the air leak. The problem is the intake leak is probably only expanded or exaggerated by the rush of air when you push the throttle, so at idle that vacuum leak can't be identified since the vacuum pull is not great enough.
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  #4  
Old 04-25-2012, 07:52 AM
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veteran011 veteran011 is offline
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using carburetor cleaner probably made your issue worse buddy. that stuff EATS rubber.... you may want to start replacing anything on the intake side that is remotely rubber.
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  #5  
Old 04-25-2012, 09:54 AM
Killybeys Killybeys is offline
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Well it hasnt done anything to it yet so ill wait and see. And to RhymeGrime i checked it and everything looks ok, im going to take it off later and look at it from a full view rather than just glancing at it.
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  #6  
Old 04-25-2012, 10:00 AM
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Moeman10 Moeman10 is offline
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You have a vacuum leak somewhere, find it.
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  #7  
Old 04-25-2012, 10:33 AM
Killybeys Killybeys is offline
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Ya im going to look over everything to do with intake today and see if I can find any major leaks. And I think it might be doing something to the idle as well, so hopefully I can kill two birds with one stone.
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  #8  
Old 04-25-2012, 02:16 PM
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petriej petriej is offline
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I had a similar issue I was able to patch up with caulk and duct tape. Lasted about 6 months before I had to just replace the intake boot.
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  #9  
Old 04-25-2012, 02:50 PM
lenzhome lenzhome is offline
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I just purchased a 1997 328iC and it was doing something very similar, but wouldn't hold the idle. It was the vacuum tube from the intake to the motor. Where it connects to the intake, the hose was cracked, but couldn't see it until it was disconnected. Replaced and it runs like a champ.
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  #10  
Old 04-26-2012, 02:49 AM
david656 david656 is offline
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Well, not wishing to go against the good idea's but my 323i had that symptom of breathing in, then accelerating - with the delay.

Amongst many issues it had this went away instantly after doing oxgen sensors and crank position sensor.

If you disconnect the batter and then let the ECU reset... after starting it again in the first few minutes is that problem still there? if not then it might be something other than a leak.
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  #11  
Old 04-26-2012, 04:16 PM
Killybeys Killybeys is offline
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This hose is split and that about the only thing I found wrong with it. It's right below the main hose that goes from the throttle body to the air housing.
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  #12  
Old 04-26-2012, 05:02 PM
lenzhome lenzhome is offline
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That was the one I replaced, and fixed the issue I was having.
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  #13  
Old 04-27-2012, 12:15 PM
Killybeys Killybeys is offline
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Ok ill try and replace it then, it looks like a huge ordeal. did you do it yourself? or did you take it to a mechanic.
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  #14  
Old 04-27-2012, 01:19 PM
lenzhome lenzhome is offline
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To be honest, first thing was to trim the hose below the crack and hook it back up. There seemed to be enough, and started it. If it holds it probably will be fine, or though a small hose clamp on it. And then I replaced it, which wasn't fun. But if the first works, great.
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  #15  
Old 04-27-2012, 02:33 PM
Killybeys Killybeys is offline
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I disconnected everything and the sound is coming from underneath the intake manifold, so im thinking it could be that hose but the sucking noise is coming from under there so im thinking i might have to take everything off and try and find it then.
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  #16  
Old 04-27-2012, 03:17 PM
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B_Rad_M3 B_Rad_M3 is offline
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It's your hidden turbo....

Check the gaskets, IIRC there are hoses under the intake manifold too... Maybe it's missing or cracked..
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  #17  
Old 04-27-2012, 04:31 PM
tchavera tchavera is offline
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spray carb cleaner down at the intake mani. sounds like the gasket is bad
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  #18  
Old 04-27-2012, 07:38 PM
Killybeys Killybeys is offline
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Quote:
Originally Posted by Brad31late View Post
It's your hidden turbo....

Check the gaskets, IIRC there are hoses under the intake manifold too... Maybe it's missing or cracked..
After listening to it, the sucking noise its defenatly coming from under the intake manifold, i tried to find it without taking it out and i couldnt. so this weekend im going to take everything apart and find it. and ive tried to spray carb cleaner everywhere and it hasnt done anything so i need to take it apart and look.
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  #19  
Old 08-14-2012, 07:32 PM
deweyweekender deweyweekender is offline
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So I don't understand how carb cleaner helps you find a leak?!?

Also did you find any leaks? My '95 325 vert just started doing the same thing.
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  #20  
Old 08-14-2012, 07:39 PM
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jonesin jonesin is offline
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Spray the carb cleaner along each vacuum hose.

When the engine revs differently, you've found a vacuum leak.
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