my F355 2.7 have troubles from 1000 to 3.500 rpm and after it works well. When I sart it seam to run on not all the cylinders and sometime all, makes irregular explosions. Like aproblem of ignition I think.. I was thinking about problem on the sensors on the TOOTHED WHEEL AND PULLEY on the CRANKSHAFT. I had this trouble on 348 due to oil leak and dust on it but dont know if sometime happen on 355 havin more and more electronic components. Wanted to make a OBD diagnos but dont have one under the steering colomn and cant find it.
I good place to start is with the codes. Also check all the wires and connections, this includes the sparkplug wires(leads). You may also have a problme with the MAFS connection. But the best place to start would be to pull the codes.
I have had a smaller problem with rough idle and a bit of popping of exhausts etc . A good thing to try is to switch off your battery isolator over night. it is situated in your trunk on the wheel arch. In the morning ensure that the radio and airconditioning and all electrical bits are turned off. Turn the switch back on and allow the car to idle. Do not touch the accelerator at all. The car may run roughly for a minute or so but then the ecu will self assess and slowly reset all mixtures etc. and eventually it should quickly run smooth again. This may well solve your problem. It will not harm anything.I did not need to reset my radio however ensure you have the code available just in case, you will also need to reset you clock but that is easy. regards Tony
NO! Do not do that. The reason is with the 2.7 it will erase any code that is stored in the ecu. It will make it harder for him to diagnose what the problem is, with out the code that cause the CEL to come on.
Already done the reset like this but it doesnt repair the car ! I would like to find the source of the problem..
I went under the car and there is no oil leak that could cause troubles on the TOOTHED WHEEL AND PULLEY ... Will look all the connector and clean.
Also look under the rubber boot covering the wires on the back of the sensor. Make sure that there are no broken wires under the boot.
