Tech question for Evosport or other mechs
Thread Starter
Member
Joined: Jun 2002
Posts: 236
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From: Antwerp, Belgium
C32
Tech question for Evosport or other mechs
Maybe you remember I posted about a week ago that my cars engine is doing weird.
The MB techs have changed the iridium plugs . They saw on the computer that the number 3 cylinder had misfired. Also the plugs that where removed where moist.
Since then the car is running OK, but I feel that when I stop for a red light or just dont move the engine is not 100% smooth as before.
Now here is something I noticed yesterday : the low windshield warning came on (remember I have the Evosport cooling upgrade). That is very strange because I filled it up a week ago and have not used a drop since than. So I filled it up again.
My question is following : is there some way the IC water from the IC could reach the engine/plugs if there where a leak ??
I did a visual check for a water leakage myself but I saw nothing.
Thx,
Bart
The MB techs have changed the iridium plugs . They saw on the computer that the number 3 cylinder had misfired. Also the plugs that where removed where moist.
Since then the car is running OK, but I feel that when I stop for a red light or just dont move the engine is not 100% smooth as before.
Now here is something I noticed yesterday : the low windshield warning came on (remember I have the Evosport cooling upgrade). That is very strange because I filled it up a week ago and have not used a drop since than. So I filled it up again.
My question is following : is there some way the IC water from the IC could reach the engine/plugs if there where a leak ??
I did a visual check for a water leakage myself but I saw nothing.
Thx,
Bart
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,289
Likes: 3
From: OC
C32
It is possible for the IC fluid to enter the intake. If the IC core(between supercharger and engine) leaked it could cause the fluid to leak into the intake stream and into the combustion chamber. I do not think it would show up as wet spark plugs. The water would vaporize in the combustion chamber.
Make sure there is no where else the fluid could be leaking from, because it does not sound like a cheap fix if it is the IC Core.
Make sure there is no where else the fluid could be leaking from, because it does not sound like a cheap fix if it is the IC Core.
Super Member
Joined: Jan 2004
Posts: 538
Likes: 2
From: Silicon valley
Audi C7.5 S6
Three possibilities water on the plugs:
1.) Leaking A/W Intercooler in intake manifold/supercharger (already mentioned above).
2.) Leaking intake intake manifold or head, between the water jacket and the intake port or combustion chamber.
3.) Leaking head gasket.
>>> It is most likely, number 1. <<<<<
One could do pressure check of the IC coolant system, to see if there is a leak. It should hold at least 6.0 LBS/sqin. One needs to seal off sections of the IC system, to do a pressure check.
It is common to do similar pressure checks of the engine cooling system, but the pressure can go to 16 LBS/sqin.
This may give you some ideas, here is a link to a simple intake air test on the Audi S4.
http://www.awe-tuning.com/media/pdf/...ure_tester.pdf
It does not take anything fancy, but a low pressure regulator, gauge and sealing off
normal air leakage paths. I would not run above 10 LBS/sqin, 6 LBS/sqin will probably find a leak, if there is one.
Just use care and common sense, when checking it.
1.) Leaking A/W Intercooler in intake manifold/supercharger (already mentioned above).
2.) Leaking intake intake manifold or head, between the water jacket and the intake port or combustion chamber.
3.) Leaking head gasket.
>>> It is most likely, number 1. <<<<<
One could do pressure check of the IC coolant system, to see if there is a leak. It should hold at least 6.0 LBS/sqin. One needs to seal off sections of the IC system, to do a pressure check.
It is common to do similar pressure checks of the engine cooling system, but the pressure can go to 16 LBS/sqin.
This may give you some ideas, here is a link to a simple intake air test on the Audi S4.
http://www.awe-tuning.com/media/pdf/...ure_tester.pdf
It does not take anything fancy, but a low pressure regulator, gauge and sealing off
normal air leakage paths. I would not run above 10 LBS/sqin, 6 LBS/sqin will probably find a leak, if there is one.
Just use care and common sense, when checking it.
Thread Starter
Member
Joined: Jun 2002
Posts: 236
Likes: 0
From: Antwerp, Belgium
C32
Guys, you where right about it !
Quick update.
The found a leak in the IC core which they have replaced. So far so good but I am still keeping a bottle of water in my trunk just in case the engine starts drinking water from my windshieldwater reservoir again.
I hope they will cover it under warranty (actually I am just 2 months past the deadline .....)
BV
Quick update.
The found a leak in the IC core which they have replaced. So far so good but I am still keeping a bottle of water in my trunk just in case the engine starts drinking water from my windshieldwater reservoir again.
I hope they will cover it under warranty (actually I am just 2 months past the deadline .....)
BV
