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any issues with the direct injection and carbon build up/coking on the valves?
In my book to stop the issue is add the Mighty Mouse Solution PCV kit ,
Put a stop to oil debris getting in to the intercoolers though the supercharger to the valves. Do that and the issues you mentioned are nonexistent.
You can see the build up this 29k.I would say 20 percent blockage.
In my book to stop the issue is add the Mighty Mouse Solution PCV kit ,
Put a stop to oil debris getting in to the intercoolers though the supercharger to the valves. Do that and the issues you mentioned are nonexistent.
You can see the build up this 29k.I would say 20 percent blockage.
I’ve been heavily considering the MM catch can for this reason. I have 7k on the odometer
any issues with the direct injection and carbon build up/coking on the valves?
85K had the supercharger manifold off earlier this year.
Didn't see any coking on the valve head itself. Didn't see any build up on the valve head itself.
I did see a slight build up of a gel type residue on the valve stem.
This was right at the point on the stem where the valve is fully open and the stem has retracted into the head as far as it goes.
In other words this gooey gel gathers where the travel ends and where the seal ceases wiping the stem.
My observation was this gel could possibly coke if one were not using synthetic oil, but its on the stem not the seat or back of the valve head (so who knows if this would cause a problem).
However as it was in my case the gel was easy to remove.
Since the build up was not very large I assume once the glob gets to a certain mass or weight it falls off and gets sucked into the engine and burned.
The other thing I noted is my oil consumption is only about 1/4th qt or so between oil changes using the oil life monitor for oil change intervals.
Sorry I didn't take photos.
But knowing what coking valves look like, I wasn't concerned when I saw my valves at 70Kish miles with the oil consumption I have.
JMHO .....YMMV.
Last edited by dar02081961; 07-09-2018 at 12:29 PM.
In my book to stop the issue is add the Mighty Mouse Solution PCV kit ,
Put a stop to oil debris getting in to the intercoolers though the supercharger to the valves. Do that and the issues you mentioned are nonexistent.
You can see the build up this 29k.I would say 20 percent blockage.
Plus $2 every time he mentions their name. Should have couple hundred bucks by now. Just busting chops 3Z!
85K had the supercharger manifold off earlier this year.
Didn't see any coking on the valve head itself. Didn't see any build up on the valve head itself.
I did see a slight build up of a gel type residue on the valve stem.
This was right at the point on the stem where the valve is fully open and the stem has retracted into the head as far as it goes.
In other words this gooey gel gathers where the travel ends and where the seal ceases wiping the stem.
My observation was this gel could possibly coke if one were not using synthetic oil, but its on the stem not the seat or back of the valve head (so who knows if this would cause a problem).
However as it was in my case the gel was easy to remove.
Since the build up was not very large I assume once the glob gets to a certain mass or weight it falls off and gets sucked into the engine and burned.
The other thing I noted is my oil consumption is only about 1/4th qt or so between oil changes using the oil life monitor for oil change intervals.
Sorry I didn't take photos.
But knowing what coking valves look like, I wasn't concerned when I saw my valves at 70Kish miles with the oil consumption I have.
JMHO .....YMMV.
85k miles is very commendable. Is your car an a8 or m7?
Any issues over the 85k miles -water pump , supercharger serpentine belt, alternator, any issues with the dash electronics, leaks in any of the other systems or radiators etc?
85k miles is very commendable. Is your car an a8 or m7?
Any issues over the 85k miles -water pump , supercharger serpentine belt, alternator, any issues with the dash electronics, leaks in any of the other systems or radiators etc?
M7 Sir...........2 minor issues.
1. Rear rotors warped at 13K (covered under warranty) could have been my fault since the same thing happened to my 14 Z51.
2. A small area of material on the drivers seat around the seat belt guide hook has come slightly un-tucked a few times. I just tuck it back in. It would be covered under warranty if I bothered.
Of course my rear quarter panels are taking a beating so I hope to install the skirts I purchased from a friend when I take the time.
Very pleased, best car I have ever owned.
Last edited by dar02081961; 07-09-2018 at 07:53 PM.
M7 Sir...........2 minor issues.
1. Rear rotors warped at 13K (covered under warranty) could have been my fault since the same thing happened to my 14 Z51.
2. A small area of material on the drivers seat around the seat belt guide hook has come slightly un-tucked a few times. I just tuck it back in. It would be covered under warranty if I bothered.
Of course my rear quarter panels are taking a beating so I hope to install the skirts I purchased from a friend when I take the time.
Very pleased, best car I have ever owned.
Forgot to mention the arm rest material has held up well, however it is retaining a wrinkle from the point of my elbow.
Forgot to mention the arm rest material has held up well, however it is retaining a wrinkle from the point of my elbow.
this is awesome to hear this durability.
I have had my 2017 m7 for about 6months and have been wondering if this is a car I want to hang on to or keep short term. It’s good to see an example of these cars if driven reasonably can have less maintenance issues then a Honda Civic.
Other then the consumables of tires it doesn’t seem too bad.
07-07-2018, 02:56 PM
Post your high mileage LT4
