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-   -   starts but wont idle or run help (http://www.unitedbimmer.com/forums/showthread.php?t=38799)

bmwbroke 01-14-2012 09:41 PM

starts but wont idle or run help
E39 97 540i car ran real rough when i limped it in, smoked ran really rich. then wouldn't start. I since have tested coils and boots with ohm meter they test ok. i read the codes got various cylinder missfire codes, maf code, coolant temp sensor code, evap circuit code, and cam sensor code. So the parts war began. In this order I replaced Cam sensor, coolant temp sensor,hoses going to ccv, intake manifold gaskets (all of them), the icv, throttle position sensor, cleaned the plugs. So now the car starts but wont idle dies right away still smell gas so still rich. what next:confused

DEATH2000 01-15-2012 10:48 AM

Welcome to United Bimmer. After replacing all these parts did you get the codes scanned again to see which ones have gone and which ones are still their? Start with process of elimination. Let's see if you got rid of any codes and if you gained any. Fuel injectors would be the next thing to look at.

bmwbroke 01-16-2012 08:52 AM

ok replaced throttle position sensor, and it now started and idled fine test drove it everything ok. Then turned it off and nest time i went to drive it. She ran rough wanted to stall and didn't respond well had to rev it up, but engagr the clutch and she wouldn't go just bog down and barely move. new os2 codes bank 1 and 2 came up. could it running rich fouled the os2 sensors?

DEATH2000 01-16-2012 11:53 AM

Its possible. You said you replaced the ICV, but is it operating correctly? The codes that come up are saying the O2 sensors are bad? If the O2 sensors are bad the DME doesnt know what's coming out of the engine and can't adjust the air fuel mixture correctly.

bmwbroke 01-21-2012 02:13 AM

ok the car will now start up but when cold runs rough sometimes stalls runs better after warming up or reving it up some to keep it going checked codes got:P0300: Random/Multiple Cylinder Misfire Detected
P0304: Cylinder 4 Misfire Detected
P0303: Cylinder 3 Misfire Detected
P0302: Cylinder 2 Misfire Detected
p1585: (dont know what it means)
P0130: O2 Sensor Circuit (Bank 1 Sensor 1)
P0150: O2 Sensor Circuit (Bank 2 Sensor 1)
P0136: O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0156: O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
what now the car does run but not like she should any help anyone can give me would be awesome. besides the obvious os2 replacing

DEATH2000 01-21-2012 02:24 PM

Have you replaced the O2 sensors? Have you checked to make sure they properly seated and the wires are intact and the sensor isn't worn or damaged?

Big Evil 01-24-2012 08:28 PM

I'm hesitant to interject here, but it seems like taking a step back and looking at the system as a whole instead of a collection of parts is what is warranted at this point. Right now I would ignore the misfire and o2 sensor codes, they're more likely symptoms of the problem and not causes.

Your problem is running rich and rough, which can cause the other codes. So isolate what goes in the front of the engine, you need air (non-clogged unrestricted air filters/flow), a metering device (throttle plate) and a measuring device (MAF). The system also needs to be absolutely sealed after measuring device. So the intake runners, boots and ALL the vac lines need to be checked and if necessary smoke tested to verify there are no leaks. Then you need to be certain all the passage ways and actuators are clean and functioning (ICV, PCV etc.). Also need to be certain everything is plugged in correctly and all the connectors are seated and none of the pins have pushed out the backs of the connectors or have been stretched causing poor contact. Chances are you will find your problem in the intake metering system and your other problems will go away. I find it VERY difficult to believe all those parts went bad all at once, it just doesn't happen that way.

Careful diag will uncover your problem, there's more than likely only one problem and the rest are symptoms of that problem

bmwbroke 02-21-2012 05:54 AM

update and thanks
thanks for all the advice it is appreciated. sorry I havent been on computer to have responded in timely matter. So i replaced os2 sensors it ran still has hic up. replaced the fuel regulator and runs much better. cleared codes drove few trips and enginge ligbht came back on codes now are fuel trim and idle control. as far as air leaks i changed intake manifold front ,back ,and on bottom ones for valves after doing smoke test i will try smoke test again. also now hear rumbbling sound comingg from rear. checked diff fluid was full but black changed it car felt better but sound didn't go away. any ideas?

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