Oil fouled plugs on one side?
10-03-2010, 05:27 PM
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Oil fouled plugs on one side?
My 93 GTS has a healthy appetite for oil and likes to chuck out a cloud of smoke either on the over run or when you pick up the throttle immediately afterwards. I'd planned on fitting a Shark Vent as I thought this may cure it, then a friend of mine said the only way to cure this was to pull the engine and rebuild it so I cancelled the Shark Vent to put the money towards parts for the rebuild (135 000 miles on engine).When I changed the plugs a few days ago I noticed that all four plugs on the drivers side (RHD) were fouled with oil deposits but the four on the other side were the normal light tan colour.
Before I go to all the trouble of pulling my engine does anybody have any thoughts as to why only one side of the engine would be effected. After all it's not as if the right hand side of the engine has done more miles than the left so I'd expect to see the same both sides. Could this be a crankcase venting issue, or is there something sinister causing this problem?
Any advice as awaly's would be greatly appreciated.
10-03-2010, 06:52 PM
#2
Race Director
Since the stock breather is injected into the lower part of the throttle body...in theory it should spread to all cylinders equally...but you are seeing far more on only one side.....which is odd....since I also find it unlikely that the entire bank has bad valve seals or leaky headgaskets....
10-03-2010, 07:20 PM
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Your friend was wrong, the shark vent will help the oil smoke problem and to a small extent the oil consumption problem. It completly eliminated the smoke problem on my 93 GTS.
Does your GTS have the full GTS breather mod or has it been de-moded? Is there a vent hose from both cam covers?
I would start by replacing all 8 spark plugs and re-check them in 1000K or so. Verify that you have a problem on only one bank of cylinders. I don't really have any ideas on why only one side.
Does your GTS have the full GTS breather mod or has it been de-moded? Is there a vent hose from both cam covers?
I would start by replacing all 8 spark plugs and re-check them in 1000K or so. Verify that you have a problem on only one bank of cylinders. I don't really have any ideas on why only one side.
10-03-2010, 07:26 PM
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Your friend was wrong, the shark vent will help the oil smoke problem and to a small extent the oil consumption problem. It completly eliminated the smoke problem on my 93 GTS.
Does your GTS have the full GTS breather mod or has it been de-moded? Is there a vent hose from both cam covers?
I would start by replacing all 8 spark plugs and re-check them in 1000K or so. Verify that you have a problem on only one bank of cylinders. I don't really have any ideas on why only one side.
Does your GTS have the full GTS breather mod or has it been de-moded? Is there a vent hose from both cam covers?
I would start by replacing all 8 spark plugs and re-check them in 1000K or so. Verify that you have a problem on only one bank of cylinders. I don't really have any ideas on why only one side.
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10-03-2010, 08:36 PM
#8
Team Owner
air pump has nothing to do with the oil consumption
10-04-2010, 12:35 AM
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Excessive oil consumption is a known issue for the GTS . The factory execuctive cars were said tp have been fitted with new replacement engines BEFORE being sold to the public. At least one GTS in G B got two new engines under warranty. When rebuilding one should drill the oil drain back holes under the oil ring.....all other 928s have holes but the GTS "holes" are blind they do not go all the way through.
10-04-2010, 04:58 PM
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Sorry not very good photo's but you should get some idea of the difference between the plugs on each side of the engine -Right Side
Left side -
If not I'll try and get some better ones.
10-04-2010, 05:47 PM
#11
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Hello
By all means check all of the above , but if you have a common denominator on 1 side of the engine , you need to find something that is common to the difference . Looking at the photo you need to check your camshaft timing as one side is burning well , the other is out .
Has the car had the belt changed in the recent past ?
possibility that the specs were not set correctly .
If you do not feel confident to perform this work yourself , I am sure that there are some helpers near you or a competent mechanic who is familiar with the marque .
The black set look like the the side has to much a retard in the cam timing .
Good luck .
By all means check all of the above , but if you have a common denominator on 1 side of the engine , you need to find something that is common to the difference . Looking at the photo you need to check your camshaft timing as one side is burning well , the other is out .
Has the car had the belt changed in the recent past ?
possibility that the specs were not set correctly .
If you do not feel confident to perform this work yourself , I am sure that there are some helpers near you or a competent mechanic who is familiar with the marque .
The black set look like the the side has to much a retard in the cam timing .
Good luck .
10-04-2010, 07:17 PM
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10-04-2010, 07:35 PM
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Hello
By all means check all of the above , but if you have a common denominator on 1 side of the engine , you need to find something that is common to the difference . Looking at the photo you need to check your camshaft timing as one side is burning well , the other is out .
Has the car had the belt changed in the recent past ?
possibility that the specs were not set correctly .
If you do not feel confident to perform this work yourself , I am sure that there are some helpers near you or a competent mechanic who is familiar with the marque .
The black set look like the the side has to much a retard in the cam timing .
Good luck .
By all means check all of the above , but if you have a common denominator on 1 side of the engine , you need to find something that is common to the difference . Looking at the photo you need to check your camshaft timing as one side is burning well , the other is out .
Has the car had the belt changed in the recent past ?
possibility that the specs were not set correctly .
If you do not feel confident to perform this work yourself , I am sure that there are some helpers near you or a competent mechanic who is familiar with the marque .
The black set look like the the side has to much a retard in the cam timing .
Good luck .
Thanks for the advice I'll get it checked out, is this a major job, also do you know if this would contribute to the oil consumption and smoke problem, I know GTS's are renowned for their oil consumption. I could tolerate a reduction if it saves pulling the engine right down. If the cam timing was out and it helped to reduce the consumption I would probably go with the Shark Vent and an intake refresh, rather than taking everything out and drilling pistons etc.