R56 R56S stalling
#1
R56S stalling
Hi all,
I'm trying to diagnose my car occasionally stalling. It's a 2009 R56S auto, with 86K kms (53K miles). Car has never been tracked, has been tuned with an Alta AccessPort for most of its life. Recently, it's been occasionally stalling when in 'D' and stopping on red lights/stop signs. Restarting the car works fine and it runs fine for a while. I've not been driving it a lot in the last few months at all, so I can't say with which frequency it happens, but let's say if driven 2-3 hours per day on average, then it'll maybe stall once a day.
I admit to not having diligently verified oil every day, but oil's been changed roughly every 10-11K (7-10K miles). Most recently a few weeks ago. This has not addressed stalling. There's a 'superknock' code logged in the DME that's been persistently sitting there for at least a year; dealer ignored it in the past, and now warranty is out.
No other major engine-related maintenance has been done (belts, spark plugs, coils, etc).
What should I consider doing next? Should I replace spark plugs and/or coils, or is this randomly throwing money at an unknown problem? Should I scan/diagnose more? I have both a Bavtech and an INPA cable, so I can scan anything needed.
I'm trying to diagnose my car occasionally stalling. It's a 2009 R56S auto, with 86K kms (53K miles). Car has never been tracked, has been tuned with an Alta AccessPort for most of its life. Recently, it's been occasionally stalling when in 'D' and stopping on red lights/stop signs. Restarting the car works fine and it runs fine for a while. I've not been driving it a lot in the last few months at all, so I can't say with which frequency it happens, but let's say if driven 2-3 hours per day on average, then it'll maybe stall once a day.
I admit to not having diligently verified oil every day, but oil's been changed roughly every 10-11K (7-10K miles). Most recently a few weeks ago. This has not addressed stalling. There's a 'superknock' code logged in the DME that's been persistently sitting there for at least a year; dealer ignored it in the past, and now warranty is out.
No other major engine-related maintenance has been done (belts, spark plugs, coils, etc).
What should I consider doing next? Should I replace spark plugs and/or coils, or is this randomly throwing money at an unknown problem? Should I scan/diagnose more? I have both a Bavtech and an INPA cable, so I can scan anything needed.
#3
#4
How do I check coking on valves? Does the head have to come apart for this, or will the spark plugs tell a story?
#5
First check your spark plugs since that is the easiest and cheapest repair if it is needed at all, a fouled plug can cause all sorts of problems especially if you have carbon buildup on the intake valves. The head doesn't need to be removed for the intake valve check and or cleaning, the plastic intake manifold needs to be removed which isn't that hard. After you get the intake manifold off find a strong flashlight and then you can see your valves. I like flashlights that allow you to focus the beam of light because you're going to need a narrow beam to be able to see down those long small diameter intake runners. Have you tried removing the tune to see if your problem persist?
#6
First check your spark plugs since that is the easiest and cheapest repair if it is needed at all, a fouled plug can cause all sorts of problems especially if you have carbon buildup on the intake valves. The head doesn't need to be removed for the intake valve check and or cleaning, the plastic intake manifold needs to be removed which isn't that hard. After you get the intake manifold off find a strong flashlight and then you can see your valves. I like flashlights that allow you to focus the beam of light because you're going to need a narrow beam to be able to see down those long small diameter intake runners. Have you tried removing the tune to see if your problem persist?
I guess I will first switch the spark plugs and check the valves; then remove the tune, one step at a time. If that doesn't help, then coil packs ... and then bang my head on the wall for lack of any other ideas
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