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7 Series - E38 (1995 - 2001)

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  #1  
Old 02-08-2013, 07:45 PM
Kevin Halbleib Kevin Halbleib is offline
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1995 740il Rough idle and drive

I just was driving down the interstate and all of the sudden the car seemed to start running rough. YOu can smell gas after awhile.

Seems to be kind of missing.


I did try to do the OBD1 code pull. I get code 1221. But it keeps repeating and I cannot seem to get it to quit.

Does not die, does not run hot. Easy to start.

Please help.
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  #2  
Old 02-09-2013, 06:00 AM
Espresso Espresso is offline
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Mein Auto: 2001 740i Sport
02 sensor.
not going into closed loop mode. You are more than likely running rich & fouling plugs which make it hard to start when cold.

Last edited by Espresso; 02-09-2013 at 06:01 AM.
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  #3  
Old 02-09-2013, 06:27 AM
Kevin Halbleib Kevin Halbleib is offline
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Can I just unplug or do I have to replace?
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  #4  
Old 02-09-2013, 09:20 AM
First740i First740i is offline
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Pull your plugs! First thing to look at. I have 160,000 miles and o2's are fine. Had that symptoms it was plugs

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  #5  
Old 02-09-2013, 12:51 PM
Kevin Halbleib Kevin Halbleib is offline
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I pulled the plugs and replaced. Passenger side plugs were dry and old looking. Drivers side were a little normal and a couple were some oily.

Replaced. Seemed to be no change. Car will start and run. At idle speed very rough. If I rev up at higher rpm's smooths out in driveway.

I am assuming next step is 02 sensor. However I am not sure where to start. Should I buy one or can I simply unplug to test? Any advice?
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  #6  
Old 02-09-2013, 06:14 PM
First740i First740i is offline
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Id save some money and test them. Did the plugs ha a lot of ill on them? If so you need to to valve cover gaskets. As the gasket wears out over time the oil it lest in shorts out the plug sounds stupid I know but true! If there is oil puddling up around them that could very well be your problem!

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  #7  
Old 02-09-2013, 09:05 PM
Kevin Halbleib Kevin Halbleib is offline
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There was a little oil puddling. Not to bad. But if I put new plugs in, I would have expected a big improvement.
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  #8  
Old 02-10-2013, 08:42 AM
First740i First740i is offline
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Yes i agree. I do not know!?

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  #9  
Old 02-10-2013, 09:14 PM
Ocotillo Ocotillo is offline
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Mein Auto: 1998 BMW 740IL
I am having the same issue on my 98 with 123k miles. I am getting a p0308 error code (misfire on cylinder 8). I have completed the following repairs but the error code still persisting and the car is rough when idle.

1. Tested spark plug coil (error did not move with coil)
2. Replaced all spark plug with Bosch Platinum+4 spark plug
3. Replaced valve cover gaskets
4 Replaced Intake manifold plate (behind engine) and the gasket
5. New fuel pump and fuel filter (for unrelated reason)

Despite all these repairs, the car is still rough when idle but otherwise runs fine when it's moving. What are the symptoms of a bad o2 sensor? Is there a way to test the o2 sensor?
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  #10  
Old 02-10-2013, 10:02 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Mein Auto: E23;E30;E38;E32;E34 +
I haven't heard of an O2 sensor test. Onlt thing I can think of is test resistance of all sensors hot and cold and compare results. I guess one or more will be bad. Take results from the 'good' side as correct. Maybe compare with a good known engine?
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  #11  
Old 02-11-2013, 06:18 AM
Kevin Halbleib Kevin Halbleib is offline
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Interesting enough. I sprayed brake cleaner looking for a vacuum leak. I did get a little on top, engine reved up and I went to try and find it, but it would not repeat. Took the car for a drive and within a few minutes, it started getting better. Went for about a 45 minute drive and it is driving perfect.

I notice a very little rough idle, I still get 1222 & 1221 error codes which are o2 sensor codes. But really runs so good, I am not really worried about it. I used copper plugs and cleaned out the oil.
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  #12  
Old 02-13-2013, 01:55 PM
jitsjaf2009 jitsjaf2009 is offline
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My limited experience, you may be having a failure of your oil separator and getting oil into your intake manifold. This would cause the couple oily pluggs...usually plufs to 'rear' of intake (next to firewall. Also rough idle which smooths out with increased RPMs could indicate intake leaks or vacuum leaks. These are what I would look for first.
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  #13  
Old 02-13-2013, 06:37 PM
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BMWFatherFigure BMWFatherFigure is offline
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O2 sensors fail. Change them.
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Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
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  #14  
Old 02-13-2013, 07:40 PM
Kevin Halbleib Kevin Halbleib is offline
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I will change the 02. Thanks to all!
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  #15  
Old 02-14-2013, 05:31 PM
First740i First740i is offline
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You still have no changer o2? Holy long process you have gone trought

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  #16  
Old 02-14-2013, 07:31 PM
Kevin Halbleib Kevin Halbleib is offline
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I have not done anything further. 02 sensors will be next.
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