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7 Series / 8 Series
The BMW 7 series and 8 Series Forum

 
 
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  #1  
Old 04-04-2007, 11:39 AM
Sean McClellan's Avatar
Sean McClellan Sean McClellan is offline
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Location: Florida
 
Join Date: Feb 2007
Posts: 116
Mein Auto: 1993 740iL
Exclamation Rough Spark Plug Idle

Hello I was just wondering if anyone knows how hard it is to get to the spark plugs on a 1993 740iL. I was just curious, I plan to rip my engine out next year and rebuild the top half of the engine.
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  #2  
Old 04-04-2007, 11:59 AM
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TerryY TerryY is offline
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Location: Woodland Washington
 
Join Date: Jul 2003
Posts: 662
Mein Auto: BMW '95 840
If you have not got to the plugs yet, how do know you want to do the top end rather than the bottom end?

Symptoms?
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  #3  
Old 04-04-2007, 12:23 PM
Sean McClellan's Avatar
Sean McClellan Sean McClellan is offline
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Mein Auto: 1993 740iL
I would like to do the top end because my heads are leaking oil
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  #4  
Old 04-04-2007, 01:27 PM
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TerryY TerryY is offline
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Location: Woodland Washington
 
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Mein Auto: BMW '95 840
Where is the leak? outside?

If it is smoking it probably isn't your heads.

If it leaking outside it is most likely just gaskets that can be changed without ripping anything out.

The spark plugs are under the black covers on each side. The coils are mounted directly over each spark plug.

10 mm deep socket is needed to remove all of the covers and the coils.
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Woodland Washington
'95 840Ci
'00 Range Rover Vitesse
www.wuffer.net
www.8coupe.com
www.8er.org

Last edited by TerryY; 04-04-2007 at 01:31 PM.
  #5  
Old 04-04-2007, 08:00 PM
rapidtransit rapidtransit is offline
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Location: denver
 
Join Date: Mar 2007
Posts: 23
Mein Auto: E30/ E36
I work on these cars all day long, it is most likely the valve cover gaskets leaking. they get hard and brittle from the heat. you will know when you go to pull the plugs and the tube seals are full of oil. to replace the gaskets you will need to pull all of the small clips off of the injector connectors and hold the harness out of the way with a bungee cord. use spray trim adhesive to glue the gasket onto the cover before putting it on. dont drop any of the hollow bolts or washers for the cover they are impossible to find.
 

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