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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 02-28-2013, 11:28 PM
jordan101 jordan101 is offline
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Location: springfield
 
Join Date: Feb 2013
Posts: 37
Mein Auto: 1998 740il
changed intake manifold and valve cover gaskets now runs rough

I took my time and replaced intake manifold gaskets and valve cover gaskets. Well I got everything put back together and the car runs really rough. I let it run for 10 minutes and there is a puddle of oil under the car from the passenger valve cover It must of not seated properly. I don't know where to start with it running rough. Everything is hooked up right. When I first start it it seems to run good then all of the sudden it idles at 200-300 rpm. What do you guys think
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  #2  
Old 03-01-2013, 06:29 AM
speedkingrc speedkingrc is offline
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Location: suffolk Virginia( 7 cities)
 
Join Date: Jan 2013
Posts: 123
Mein Auto: 88 BMW 735i
Start with taking it back apart on the passager side check both seals... most likely u need to change the inner seals if you didnt do them... if you didnt change inner seals when you changed valve cover gaskets then it was no point n changin them. the inner seals are the main point of changin them.. Take them back off take some sand paper and clean the gasket seat. make sure nothings n that crack.... then after then take some red gaskets seal and run it inside the crack. u dont need alot just a small line thru the whole thing... then put the gasket back in let it set for a couple of sec. then install valve cover.. start with the one outer top screw first. dont tightin it all the way down yet tho. Go in a X pattern ok. and after all screws in. slowly put everything back together.
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  #3  
Old 03-01-2013, 09:36 PM
jordan101 jordan101 is offline
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Location: springfield
 
Join Date: Feb 2013
Posts: 37
Mein Auto: 1998 740il
I can get the valve covers fixed but I don't know why its running rough. IM pretty sure intake is on right. vaccum lines on. Only thing I noticed I didn't hooks up was intake silencer but I don't think that would make it run really rough
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  #4  
Old 03-02-2013, 05:39 AM
speedkingrc speedkingrc is offline
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Location: suffolk Virginia( 7 cities)
 
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Mein Auto: 88 BMW 735i
Did you check spark plugs and it could be o2 sensor.. or fuel filter...
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  #5  
Old 03-02-2013, 09:33 PM
jordan101 jordan101 is offline
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Location: springfield
 
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Posts: 37
Mein Auto: 1998 740il
car ran great before I did this.
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  #6  
Old 03-09-2013, 01:51 PM
First740i First740i is offline
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Location: michigan
 
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Mein Auto: 740i
You have to take it apart again. Something is not right. Make sure you have a Bentley manual for it.

Sent from my DROID4 using Bimmer App
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  #7  
Old 03-09-2013, 04:15 PM
jordan101 jordan101 is offline
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Location: springfield
 
Join Date: Feb 2013
Posts: 37
Mein Auto: 1998 740il
I took to a shop. They said the valve cover and some clips were missing from the injector. I guess it wasntsnt getting s good connection. Ill know more monday.
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  #8  
Old 03-11-2013, 08:39 PM
kimokk kimokk is offline
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Location: Alexandria, VA
 
Join Date: Dec 2009
Posts: 161
Mein Auto: 00 740iL, 97 M3
Did you get any codes like misfire codes maybe?
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BMW '00 740il w/212,xxx miles, DIY timing chain guides complete! M60 Manifold, BDC Throttle Body, Performance gearing 3.46 LSD, Magnaflow Mufflers
BMW '97 ///M3/2/5 w/96,xxx miles
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  #9  
Old 03-11-2013, 11:57 PM
jordan101 jordan101 is offline
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Location: springfield
 
Join Date: Feb 2013
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Mein Auto: 1998 740il
shop told the code came up with something to do with cylinder 7. I guess there wasn't a good connection to the spark plug. I don't see how a couple injector clips could cause a problem.
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  #10  
Old 03-12-2013, 05:17 AM
kimokk kimokk is offline
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Location: Alexandria, VA
 
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Mein Auto: 00 740iL, 97 M3
Could be the coil or fuel injector wiring harness not seated properly on fuel injector resulting in a huge misfire because its not firing (no spark to that cylinder).
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BMW '00 740il w/212,xxx miles, DIY timing chain guides complete! M60 Manifold, BDC Throttle Body, Performance gearing 3.46 LSD, Magnaflow Mufflers
BMW '97 ///M3/2/5 w/96,xxx miles
BMW '91 ///M5 w/156,XXX Smiles
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