348 dropping 58 someone please help

Did....he....check....the....condition....of....th e....wires....behind....the....boot????????

How about the connections on the MAFS?

or

The spark plug wires?

Seems to me someone is saying to quick: We have done all this and all that.
I would start again from the beginning and ignore the exclusions made by others.
Sorry, but these Motronic´s don’t really have mysteries. You have all parts, except the phase sensor at the cam, right there in the engine bay for a left right exchange test. If its not the parts, it’s the wires. Try to find a general rule when the fault appears.

Some ideas that might help:

If it seems the power to the Motronic is lost, make a temporary bridge wire from the other ECU. The fault should disappear.

Make a copy double sized copy of the ECU´s wiring diagram and mark all important wires. Left and right ECU with different colours. Helps you to track down the fault.

Hey guys, thanks for all of the info and the help. The problem is that,the relays for the 5/8 fuel pump and the relay for the injectors are tripping and intermittenly dropping power. Here is what has been done to the car. Just as Frank said, the car had the major service completed in January. The cats have been removed and replaced with pipes. All cat connections have been unplugged. I've removed the MAF'S, cleaned them, swapped them over and tie wrapped the connectors. The ECU'S have been swapped and the connectors have been cleaned. The crank sensors have been replaced and the connectors have been cleaned. The coils were swapped and plug wire boots were cleaned. The fuse panel was removed and checked, but no solder or power problems detected. We've jumped the ports in the fuse panel to send constant power to the pump and injectors, but the problem still exists. All connector plugs to the fuse panel have been cleaned as well. This is work that I have performed. The shop has been performing wiggle tests with the harness but does not seem to located a consistant problem with the harness. I can't help but believe that the problem is somewhere in the harness, but I do not have a copy of any wiring diagrams to perform any electrical tests myself. If the problem is in the harness, I think it may be too tedious of a job for the shop to dedicate to one vehicle,as there are other customers. My father is a master electrician and claims that if we had a full diagram or scematic he could locate the problem. However,this is my first Ferrari and I do not have any type of diagrams. I don't mind doing any work myself, but when respectable mechanics are baffled,I become concerned and slightly frightened. The car is currently back in the shop, but Monday I will request that the plugs and wires are checked fully as well as the wires behind the boots on the crank sensors.Thanks to everyone who posted replies and offered their help, but please keep the ideas coming.I am sure with all the help, a solution is near. Thanks again,

Tim

Hey Tim, I'm also a 348 owner who's had some very annoying, perplexing problems. Anyway, I happened across a website of a guy who's an absolute 348 (Spyder) fanatic. The part that might interest you, as it did me, is there are links to websites that you can download the full factory workshop manual for a 348. I downloaded it and just checked to confirm that the section containing electrical schematics seems to be complete. Try the following link

http://webpages.charter.net/aircover...r.html#Manuals

Cheers
Warren.

1-Since you know that the relays are dropping power,try to pinpoint which wire signal is cutting and make a bypass on this wire.I am sure with your father's help you can do a safe job.
2-Clean all ground points very good
3-Replace battery with a new one(remove the old one)you never can imagine what a battery can do even when it shows good condition.
4-Pull/push and rotate the harness in all directions with engine running and notice changes(do it the hard way,dont be afraid).
Good luck.
Bernard.

1-Since you know that the relays are dropping power,try to pinpoint which wire signal is cutting and make a bypass on this wire.I am sure with your father's help you can do a safe job.
2-Clean all ground points very good
3-Replace battery with a new one(remove the old one)you never can imagine what a battery can do even when it shows good condition.
4-Pull/push and rotate the harness in all directions with engine running and notice changes(do it the hard way,dont be afraid).
5-If there is a connector between the engine bay and the ECUs section try to clean,(I dont know exactly the configuration of the 348,but this is usually the way i practice in general and it works.
Good luck.
Bernard.

Have a look at were the wiring loom goes into the engine bay, through the fire wall, behind the seats. There is a rubber gromit that is supposed to be inside the holes. If the gromit is not there the metal from the hole could have cut through the covering of the loom causing a short in the wiring.