Persistant CEL and misfire - 360

As of 1 year ago (when I left Ferrari) they could still not explain what constituted a "cycle". I had it explained to me (so did Dave Helms) by the man at Ferrari that spoke to them that Bosch would not or could not share the information. One of the reps in the class Dave and I were in came up with the supposed cycle info but during that class upon examining it we realized that the set of circumstances required for his cycle could not happen. I hope this information is not what is being used. The sys requires that on many components several malfunctions have to happen to set the CEL. That is why the cycle information was so important to us. With out it it is hard to confirm a repair. The SD2 only tells you what parts of the engine management sys are not operating as intended. But you need to determine, is that cause, or effect? It is a method to gather information and does not point to a specific part that is bad. The information has to be interpreted. Did they by chance share with you the SD2 print out? It would be interesting to see the list of errors.

 

Do you have the related error code that comes with the CEL?

One of the problems I had was related to the misfire detection – unfortunately I can not remember the code; I think it was P0360 Multiple Misfiring Detection or something similar

The 360 have a problem with false misfire detection – detection is accomplished by monitoring the movement of teeth on the flywheel – sensor is called “Angular Velocity Sensor” but is also used for timing purposes (TDC) – misfiring is detected by changing velocity, i.e. oscillation

Assuming that you brake very hard or go over very rough roads the change in traction causes changes in load and corresponding changes in “angular velocity”, i.e. it may fake a misfire behavior

Car uses the ABS sensors to compute a road bed roughness signal (difference in wheel speed front/rear) that is fed into the ECUs to tell it when it should ignore the misfire detection signal

The mechanism is mandated by emission rules - you got to love the OBDII stuff

I did get the misfire error when I did bed my brakes and brakes very hard and once when I run over railroad tracks – the CEL however did only flash and there haven’t been any negative effects such as loss of power – only an error in one of the ECUs

F stated that the 360 is sensitive to misfire detection as explained above – specific cars may show this behavior because the combination of sensors and ECUs might just be at the edge of the detection tolerance – in my case the CS with its stiffer suspension and better brakes

Clearly (and hopefully) the dealer does not drive the **** out of your car so they might not see the problem

anyhow I feel for you ....

 

You are correct, the mult misfire is quite common, so much so we usually ignore it unless it fits in to the other symptoms. The Ferrari shops and dealers don't use the P codes. The SD2 gives a much greater and usually more specific type of info. Those are generally only used by people that use generic scanners and the SD2 is better at gathering info.

 

My CEL (engine misfire) went on last week and went off by itself a week later (today). Has that ever happened to you guys?

 

Hi Gary,
Did you solved your problem by changing the u2 sensors?

Do anyone can tell me if I can diagnose a bad ignition coil or wire by using the sd2/sd3?

David

 

Sounds like a possible intake manifold gasket leak. see if you can determine what cylinder is misfiring and check the intake manifold to cylinder head gasket. they tend to weaken and get sucked in.

Regards, Jim

 

Jim,
I have a similar problem. I did a vacuum pressure test. It have a solid reading of 22 in hg even whe I acelerate the car. Compresion test was 180 on all the cylinders. Fuel pressure is between 50&60 psi. Fuel filter is clean. Sparks are new.

The only parts left to diagnose is the wiring and the coils. That is why I'm checking if the sd2 can tell so.
A bad O2 sensor sounds logical since my cell light only pops up when I acelerate the car.