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Old 11-10-2013, 11:50 PM   #1
Dice9309@yahoo.com
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e46 Loud POP, Poor acceleration, Bogging. Please Advise

I bought a used 2000 bmw sedan 323i (160k mi now has 164k) with no service record.

My problem starts when I first turn on the car, it turns over fine but then has multiple loud pops that can heard from over 5ft away, usually more than one pop on a cold start up but very rare to happen after. (I don't look at the rpms when this happens because I turn on the car and walk to open the gate then hear the pops.)

My Second Problem is after a long drive (25mi + usually highway) I come to a stop and when the light turns green my car doesn't want to accelerate but is at a slow limp. One of two things happen from here either I turn off the car and turn it back on and it works fine or it will suddenly accelerate (Rarely but I've seen the cog (i) turn on). This doesn't always happen. I push the pedal all the way down with no increase and my rpms seem to increase but no more than 2.5k. The car also will start shaking at a stop.

It seems to bog up like not enough fuel is being burnt. So it pulls then decelerates, then pulls and will eventually stop bogging.

I also get a weird scent from the car like coolant is being burnt or a low scent of gas.

Using my Actron Scanner I get p0170 p0173 p1180 p1188

What ive done & changed:
Oil & Filter (161k)
Fuel Pump
Fuel Filter
Oil filter Housing gasket
Spark Plugs (had 4 prongs on each plug)
Upper & Lower Intake Boot
CCV
Cleaned MAF, ICV, THROTTLE BODY, DISA (had black stuff on it)
Radiator Expansion tank
Top Radiator line (from Expansion to radiator)
Ran Seafoam through intake had some white smoke not a lot
Seafoam through gas tank
Please Advise.
Thanks in advance!

Last edited by Dice9309@yahoo.com; 11-29-2013 at 11:25 PM.
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Old 11-10-2013, 11:51 PM   #2
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Old 11-11-2013, 04:57 AM   #3
jfoj
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You have addressed a lot of the common problems already, but still have lean codes.

The pop is a bit scary as if this is an intake backfire, then the intake manifold can or may already be cracked.

http://forum.e46fanatics.com/showthr...ghlight=intake

As for the the lean codes, need to look at Live/Real Time data if your tool supports this and Freeze Frame data.

Need to know if the lean codes/numbers are higher at idle than cruising or do they happen when cruising.
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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 11-11-2013, 05:58 AM   #4
NumbaOneNewb
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e46 Loud POP, Poor acceleration, Bogging. Please Advise

Cleaning the maf sensor doesn't do much. Sounds like your maf
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Old 11-11-2013, 06:21 AM   #5
jfoj
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Before you jump at replacing parts, since you have some form of scan tool available, see if it can provide Live/Real Time data and Freeze Frame data.
__________________
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 11-11-2013, 06:30 AM   #6
Ugur Ekim
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I guess you have a big leak somewhere, the first 2 codes p0170 and p0173 are leak codes. Other 2 have something to do with the o2sensor.

P1183 O2 Sensor (Bank 2 Sensor 2) Open Circuit During Coast Down Fuel Cut-off
P1188 Fuel Control (Bank 1 Sensor 1)

i think why your car can't accelerate is because it doesn't get fuel. You could check your fuel pressure how much psi it gives

on idle it should give arround 3+ bar (3.2 is the good number) and when your engine is on arround 3.5-4 bar (3.7 is the good number). If not, then i guess the fuel pump is not that great...
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Old 11-11-2013, 06:51 AM   #7
jfoj
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The OP has these codes - p0170 p0173 p1180 p1188

First I need to confirm the P1180 code is actually correct and not a P1189 typo.

But the P1180/P1188 codes may MENTION O2 sensors, but they do not mean there is a PROBLEM with the O2 sensors.

This is something I continually have to correct people on, rarely do any codes that actually MENTION a sensor, mean the sensor is actually bad. When you get lean codes, most of the time the O2 sensors are in fact working, most likely close to fully operational. For example P1188 states "Fuel Control (Bank 1, Sensor 1)". It means the O2 sensor is reading too consistently in one direction and cannot correct the fuel mixture. It may imply something is going on with an O2 sensor, but until usually this code falls hand in had with basic lean codes. Until the lean condition is corrected, not to worry about the P1188 code.

I have found all sorts of bad O2 sensors that never even trigger a code. See graph attached of a bad/lazy O2 sensor that never triggered any codes. Bank 1, Sensor 1 is lazy, but never triggered any O2 sensor codes.
Attached Thumbnails
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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

Last edited by jfoj; 11-11-2013 at 06:51 AM.
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Old 11-11-2013, 07:18 AM   #8
Dice9309@yahoo.com
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Jfoj
I will look into that I was afraid it was some thing majo, ill check theintake manifold. As to my scanning tool it does not capture live or freeze data.
Any recommended products?
Ugur
How do I check the psi?
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Old 11-11-2013, 07:32 AM   #9
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http://forum.e46fanatics.com/showthread.php?t=967204
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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 11-11-2013, 08:05 AM   #10
Dice9309@yahoo.com
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Gonna get ELM327 sice my car has both obd2 n the 20 pin connector under the hood should I consider sonething else?
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Old 11-11-2013, 08:13 AM   #11
jfoj
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Make sure your 20 pin round adapter has the cap and the jumpers are all intact in the cap. The cap and jumpers are needed for the 16 pin under dash connector to work.

If you have any question about the 20 pin connector and the cap, you may just want to order a 20 pin to 16 pin adapter cable, they are about $10-$15 on Amazon as I recall?
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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 11-11-2013, 04:50 PM   #12
Dice9309@yahoo.com
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Purchased the ElM327 And will get back with the live data.
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Old 11-11-2013, 11:39 PM   #13
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Drove the car today and heard some pops while driving one sounded like under the passenger seat while the other from the front right of the engine bay.
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Old 11-12-2013, 06:26 AM   #14
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Are these "pops" when the car is hitting any bumps or unevenness on the road?

I am wondered if these "pops" are LCAB? Lower Control Arm Bushings and not something with the engine.

Does these sound like muffled backfires and when they happen does the car jerk and/or loose power?
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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 11-12-2013, 07:51 AM   #15
Dice9309@yahoo.com
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I don't think so because when I get these pops my performance suffers and after the car goes back to normal.
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Old 11-12-2013, 07:53 AM   #16
Ugur Ekim
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You can check the fuel pressure with a special tool that you can equip on the fuel trim.
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Old 11-13-2013, 07:24 PM   #17
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Saw the idle after turning on the car and during the pops the rps drop 500-1k and the car does jerk while the poping is happening.
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Old 11-14-2013, 01:54 PM   #18
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Got a total of 13 codes
P01250 manufacer contrl fuel air metering
P0300 random/multi clin misfire
P0305 clin 5 misfire
P0173 fuel trim malfunction (bank 2)
P0302 clin 2 misfire
P0170 fuel trim malf (bank 1)
P0303 clind 3 misfire
P0301 clin 1 misfire
P1188
P1189
P0306 clind 6 misfire
1250 pd fuel air metering
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Old 11-14-2013, 01:57 PM   #19
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P0300 showed up twice
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Old 11-14-2013, 08:39 PM   #20
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Jfoj what live data do u need?
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