Trouble codes 96 F355 GTS

[DWILSON62]

Hi and thanks for reading.
I have a customers 355 which I have revived from the dead. It had sat long enough to stick some valves. I assume not enough to damage anything, because after 6 cans of commercial fuel system cleaner and an oil change, it gained back all of its compression. I have struggled thru fouled plugs, hard fail issues with o2 sensors and MAF issues. I am at the point where this thing purrs at idle and comes to life about 3000 rpm. I Still have a check engine light and slow down light after 3 drive cycles. I searched the archives and have found several threads about a code list and pdf files, but have not found any. I could really use a flow chart or trouble tree if Ferrari has such things. I purchased a nice DVD that said it had repair info. It explains in detail all the engine mechanical and transmission/ clutch breakdowns. Absolutly no diagnostics or wiring so you can see Im flying blind. Any help would be greatly appreciated. Thanks in advance.
DWilson62

[Racer86]

check voltage from O2 sensors after the cats. you may have damaged the cats with the fuel additives. Download any codes,, answer may be there.

[DWILSON62]

I have a legitimate exhaust leak on bank 1. That causes the fuel trim to be higher than bank 2. I also have a charging system issue which the owner thought was the battery. It needs an alternator, but the owner wants a fix for the check engine light and slow down light. I have searched the web for answers and still have not found that magic list of codes or the diagnostic flow charts. Gonna swallow my pride and give it back broken. I guess it wasnt ment to be. Thanks for all your support.

[DWILSON62]

Thanks Racer. Im new to the forum thing. I guess information would have been helpful.

[Racer86]

Low battery voltage will cause the check engine light to come on. also, low voltage (11.2 ) has a HUGE effect on the fuel pump as these are voltage dependant. low voltage will cause the pump to run slow and it will not produce the correct fuel pressure. viewing your thumbnails, its looks like the ecu is, at a point in time, going to a "limp home mode"
In this condition, the ecu just dumps fuel into the engine, as the low voltage really makes all the engine sensor output voltages useless to the ecu. I understand your hands may be tied by the owner, but he needs to let you replace the altenator, and fix the exhaust leak. Open step at a time,, you have to work through this,, no easy way. I did check my ORB 11 codes for your numbers. No go. These are in the next level of code, possibly only Ferrari software has them.

[ferraricyprus]

Originally Posted by DWILSON62

I have a legitimate exhaust leak on bank 1. That causes the fuel trim to be higher than bank 2. I also have a charging system issue which the owner thought was the battery. It needs an alternator, but the owner wants a fix for the check engine light and slow down light. I have searched the web for answers and still have not found that magic list of codes or the diagnostic flow charts. Gonna swallow my pride and give it back broken. I guess it wasnt ment to be. Thanks for all your support.

What p-codes do you have?
Also, before you put an alternator on there try running an earth strap between a sump bolt and the alternator fixing bolt. Poor earths are common here and prevent the alternator from charging.