N14 Cam/Crk waveform needed
Looking to find a known good cam/crank waveform for an N14 engine (2009 Mini Cooper S). This vehicle is randomly misfiring on all cylinders and I can't find a good reason as to why. Thinking I have a cam timing issue, but I need a known good waveform to compare to mine. Thanks in advance.
It’s normally the timing chain worn! It’s quite common
I decided to go ahead and pull the valve cover off since it's so easy to do, and found broken timing chain guides. Going to replace timing chain and all guides.
Scott If you have the timing tools, try placing them in the checking point (pistons all at 90 degrees) before remove the chain , and see if they fall into place , up top in the cams and in the flywheel. I had one that was out of time and jigs would not fall into place and it did not have timing codes, this is all just more for curiosity and to help confirm if it is true cause of your issue…
Check for crankcase vacuum leaks, that will cause random miss on different cylinders. I've attached waveform from an N12 , which looks like might have same trigger setup and is DOHC as well.
No high fuel pressure faults. I did compare expected and actual fuel pressure on scanner and they matched.
I does kind of feel like a large vacuum leak because it idles bad, but I have smoke tested induction system and found no vacuum leaks. (This was meant to be a reply to the above post from Sadel)
I dont have one of these, but one thing I have found on these is carboned up intake valves. I notice it most when the vehicle is started cold. It would run poor cold and then get better as it warmed up.
Very common with these as Richard says but also do you have any codes for fuel pressure or injectors as high pressure pump failure is common
I performed a walnut shell blast to this vehicle about 25,000 miles ago, so carboned intake valves is not the culprit. I have also compared expected to actual fuel pressure and they match.
Hey Scott, I had some experienced with something like this in the past and I believe this vehicle has a crankshaft variation reset. I had one in the past after replacing a timing chain and components that I had random misfires on multiple cylinders. Can you actually feel the misfire or is it just registering misfires?
Can definitely feel the misfire, idles very poor. I pulled the valve cover off and found broken timing chain guides. After the repair I will look and see if there is a crankshaft variation reset as you describe,
If it's just the upper guide your doing ( common to find broken) be sure to check the chain stretch after replacement. Or our you doing a complete chain job? Otherwise we're you able to verify crank case pressure using a manometer?
Check out this link/video from OPUS for checking chain stretch on the N motor - this is a reliable method for checking the chain we have used many times. youtube.com/watch?v=6Mla6c…
So this morning about 5am as first swallows of coffee are onboard but without effect I see your post. Several thoughts happen all at once. That is pretty old. Why doesn't he just replace the sensor? Who is going to have any waveforms? Very few heavy duty guys use a scope today never mind back then. Any data probably on a floppy disc. Test light was sophisticated back then. Open the post. Hmm…