Question about 1999 BMW 323 Series

1 Answer

Odd sound in engine

When the car is running a low popping sound emits from the engine, similair to exhuast leak but sounds more like an air pump sound. Tried to isolate it, but cannot seem to find the source. Other then that the car runs great. Anyone know what this problem could be? Thanks.

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 2 tips or uploaded 1 video tip.

  • Contributor
  • 28 Answers

It can be many things I suspect that it is either a hole in the airbox. . . . .It can also be the exhaust manifold that has developed a hole may have broken off or simply has just become loose.

Posted on Jun 26, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What causes my jeep to backfire, throw oil out of the dip stick,and for the leak detection pump to stay pumping

hark a 1991, ZJ jeep. it is.
cranks, starts and runs poorly, or stalls ? what?
your other post shows 1991. ZJ.
which engine? 4.0L inline 6? ????????????????

engine dipstick? i presume?
odd sounds?
backfire to where, air cleaner or the muffler tail pipe section?
if to Air cleaner that is gross engine timing error.
or valves, burned up or sticking. in head. no engine stated. so.. cant wax smarter.

backfire to muffler or tail pipe end, is muffler explosions, caused by too much fuel landing there
and air leaks in the exhaust path,,,, a whole other set of problems... (air = fuel = boom, there.)

"throws oil out of the dip stick" engine?
PCV valve clogged, or far worse.causes oil likes
or oil filler cap off to act odd.
also caused by gross engine failure.
do a compression test. now.

"leak detection pump" in 1991,?
not sure what pump you have in mind at all
why not post a photo of it.
with friend pointing to it

1991 has no LDP pumps. (EVAP)

Jun 03, 2016 | Jeep Cars & Trucks

1 Answer

Why does my 2000 Nissan Quest emits humming sound when engine run

Most likely, that is the sound of the FUEL PUMP. If the car is running well, don't worry about it. Try changing your fuel filter to see if that helps (usually does).
If you have trouble with fuel delivery at high speeds or under load, suspect that your fuel pump is about to fail.

May 16, 2015 | 2000 Nissan Quest

1 Answer

My Liana got a problem of Back fire I changed ignition coil first then i Change their complete head but problem remain same?

Back fire back to where, the intake or exhaust.
intake backfire is a pop sound, not too loud, and is bad timing.
exh backfire means, fuel plus air is in the exh.
and explodes with a loud report , we call it muffler explosing to help
with clear meaning.... in this latter example
you have a bad running motor (rich as pig) a dead CAT and exhuast air leak
all at the same time.

Mar 29, 2013 | 2006 Suzuki Liana 1.3

1 Answer

Two of the catalytic converters of my kia sorento jeep get red hot. My check enging light is always glowing while driving. The vehicle emits a whistling sound on throtling and the vehicle power is ver

If you scan the error codes what does it say? You can get this done at any autoparts store (chain) for free. However it sounds to me like there is some air restriction in the intake that is causing the loss of power and the exhuast is running rich. This causes the catalytic converter to overheat. You need to be mindful that any leaks of fluid near the catalytic converter can cause a fire and the loss of the entire vehicle when they get this hot.

Nov 03, 2012 | 2003 Kia Sorento

1 Answer

2005 cadillac CTS. noise behind dashboad. Water pump?

The sound is the heater getting air in it from air in the cooling system. Have the system pressure tested for leaks.

Jul 17, 2012 | 2005 Cadillac CTS

1 Answer

Black smoke from the exhuast when acelerating

Hi! You may have a faulty ECU (engine control unit). The ECU controls the air and fuel ratio, if its faulty it can really emits black smoke. Hope this helps and good luck!

May 23, 2010 | 2006 Land Rover Range Rover

2 Answers

Exhaust pops

Your right maybe but removing the gas cap will equalize any pressure. It's more likly that the inside baffle thats inside may have come loose or part of the fuel pump or gauge unit came loose. The fuel pump can make some odd sounds too but if it is don't expect it to last much longer. Does the car still run OK ? It may have a partly clogged fuel filter and the pump is working way to hard to pump the fuel and making noise doing its job.

Sep 04, 2009 | 1986 Chevrolet Caprice

Not finding what you are looking for?
1999 BMW 323 Series Logo

Related Topics:

48 people viewed this question

Ask a Question

Usually answered in minutes!

Top BMW Experts

Anthony Jones
Anthony Jones

Level 2 Expert

128 Answers


Level 2 Expert

254 Answers


Level 2 Expert

281 Answers

Are you a BMW Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides