Please could you either upload some data files or email them to support@picotech.com (mention this thread in the email). We can then analyze the data to see if the issue is specific to these Ferrari flat plane crank engines.
Today I took the readings on the F456 and the F360. Ones again and exactly like the last time they end with the ERROR on the Engine Balancing test. First of all is very difficult to get any good reading (during on the Engine Balancing Setup). I've tried to connect the leads on the Alternator, starter, battery, everywhere... Use loads as the headlights, defroster, AC,... but nothing really works. Now maybe i'm thinking that i got a bad oscilloscope...
The compression test is about the same. It doesn't work. You can compare some of the values with the manual compression test that I read with my regular compression gauge.
I'm fixing the problems as always... switching coils, switching ECU's... and following the the issues one by one... but i really would like take profit and learn to use my PICO...
Have you sent the files to support? If so I will personally check them.
It is possible both cylinder balance and compression test will have issues with flat plane crank engines but as its pretty much only Ferrari who use them on road cars we need the data to investigate.
If the scope is working OK in PicoScope (oscilloscope software) or indeed if the battery test is working OK in PicoDiagnostics then you can be sure the scope is working OK.
The car has a problem with bad idle went the engine is cold for the first 15-30 seconds. At the same time you can heard a random misfires in the plenum intake
stored code P1160 (Engine running lean)
Delete codes and car go home
next day car come back same code
Freeze data: long term fuel trim 22%
Check manual compression OK.
Change spark plugs for new ones.
Check injectors and voltage vs current test OK
Check coils and secondary vs primary test OK
Check vacuum leaks OK. (I'm still have a question with two electric valves for the fuel evaporation system. I' going to repeat the test plugging them.)
Check oil pressure (hydraulic valve tappets)
Check gas pressure in both banks ( run, idle, overnight values correct).
Check secondary air circuit (air pump function)
Check exhaust leaks and check valve.
Now the idle is good all the time (I don't know why...)but the P1160 code still there.
Hi. Well today I got home very late but I'm so happy because I get some results with the oscilloscope. I did not have the chance to 'play' with the Pico on well running cars, so I had to learn on some 'bad scenarios' and I got confused between my skills and the oscilloscope's greatnesses...
As you can see, my first try was on the Pico Diagnostics software without any results. It gave me an Error in the engine balancing test and also it showed me some death cylinders without compression.
I switched to the Picoscope 6 software with the 600A Clamp on the battery positive wire and the PP178 on each individual igntion wire...And 'Voalá!'
Apparently the ignition event on the 7-to-12 bank occurs before TDC and on the order 1-to-6 bank the ignition event occurs just after TDC. The waves have some noises but maybe it was just 'cause my beginner setting. By my math I think is about 5 degrees.
Tomorrow I'm going to play with the ignition timing elements or... Could it may be the cramshafts are off, right? Unluckily I don't have any previous history of this car...
As Mike use to say: It was fun.
Thanks for your interest to follow my work on this F456_GTA.
Sorry about my English. What is a WSP?
Here there is a better and longer reading on cylinder #01.
The firing order on this engine is: 1,12,5,8,3,10,6,7,2,11,4,9. A later model F456_M came with another firing order (they said for a smoother running).
Friday night, nobody around the shop, it's the perfect time to 'play' around with the oscilloscope!
The engine only has one cam sensor and for the ignition timing has two crank sensors on the flywheel. I switched them and I repeated the test with the same results.
Then, after looking at the wave forms I saw that the period between the sparks (no matter which cylinder) is always the same. But as you can see the frequency between the cylinders TDC is not the same. the 1-to-6 are very close to the other bank cylinders. If you pay attention on the waves they look almost like a M and then there is a long period without compression. During this period the waves look like a V.
So, the 1-to-6 bank TDC occurs too early. Tomorrow I'm going to remove the cam covers. We will see how it ends!