Mondial loosing power then finding it again

Maybe check the battery cables, ground, alternator connections or function? Definetly sounds electrical. Just a thought, I defer to the experts. Might get some help on the 348 section due to it being a T? Good luck.

Jeff

 

My problem too. If the mixture is way too rich, then you will get the "slow down" light and once the rpms get up there, the engine can suddenly breath (and thus the mixture leans out) and power comes back on.

Andrew

 

sounds like a dinoplex dropping out one bank of cylinders.

 

sounds like it, but he has an early Bosch Motronic t (2.7?), so could still be dropping a side...

It does sound electrical...

 

check the O2 sensor- if lights are coming on.
348 section where you want to be- I had a 91 348 the O2 sensors would make it code & act strange.
You can swap leads on the 348 to easily narrow down problems, both sides virtually the same-
Chris

 

i had a similar issue on my Mondial t. I describe it as "cutting out".

I unplugged the MAF connectors and replugged them. And I have not had the problem since. Not sure if that helps.

 

We had a similar problem with our 92t. Also turned out to be an O2 sensor. When ours was acting up you could smell fuel in the exhaust. You might smell fuel in the oil also.

We took it to Competizione Sport in MD and Fernando was able to isolate the problem right away with their computer.

Fernando also opened all motronic ignition connectors and applied Stabilant 22A to the connector plugs. He said that a bad connection anywhere (as in the MAF above) can cause a similar result.

Don't forget the thermocouple ECUs in the trunk.

Of course, when you fix it, change the oil right away.

Dave

 

Hi Tim,
OK one other thing & I speak from knowledge- When you replace the O2 sensors (they make original Bosch around $150 each if memory serves me right) or you can get a generic & remake the ends..

(from no doubt):
A considerably cheaper alternative to the OEM O2 sensor: O'Reilley Auto Parts carries the superior Borg Warner 4-wire factory-fit-harness O2 sensor for the 348 ($65). This BWD/BG part number is OS582. These are 4 wire O2 Sensors that DO NOT need to be spliced to your original O2 black plastic electrical connectors. They are sold with a wiring harness that is plug and play.

Once you do that you need to check the resistance readings on the MAF (mass air flow sensors) they are the 2 black things on top of motor with hoses out of front of car side (airbox to one side rear) on the side of them you will see a small round plug (may or may not be there) remove it & that is where you adjust the MAF sensors
(again from no doubt):
Your two Ferrari 348 MAF's are factory set initially at 383 Ohms resistance each. You can adjust their resistance (this resistance can be measured with the engine off by connecting an Ohm-meter to the outermost metal pins, number 1 and number 6, beneath the data signal cable on each MAF) to or from this value via a screw beneath the disposable blue cap on each MAF sensor. Adjusting the MAF resistance value will change your Air/Fuel mixture setting.

Turning this MAF screw clockwise with a flat-blade screwdriver (see photo below) thickens your air to fuel mixture ratio (per the factory workshop manual, anyway), i.e. leaning. Turning this screw clockwise will also **INCREASE** the resistance value that is measured between the outermost pins (i.e. pins #1 and #6).

YES you do need to check these values: WHY? because many jack leg mechanics tweak the settings to beat emissions instead of diagnosing the bad O2 sensor that is COMMON to fail on that engine.

Easy to do, its straightforward as are the O2 sensors-

Good Luck,
Chris