| Author |
Message |
Dan Marlett (Ferrari_dan)
New member
Username: Ferrari_dan
Post Number: 40
Registered: 9-2002
| | Posted on Thursday, December 05, 2002 - 6:05 pm: | |
Thanks for all of your help, it turns out that the Cat ECU ($260.00 for later 2.7 motronic 6 pin) was bad on the 1-4 bank. The thermocouple was fine as they usually are. Thermocouples rarely go bad.
Thanks Again
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Rexrcr (Rexrcr)
New member
Username: Rexrcr
Post Number: 9
Registered: 11-2002
| | Posted on Wednesday, November 27, 2002 - 11:29 pm: | |
There were at least three generations of Thermocouple ECU's (not to be confused with the Motronic for the engine), and I beleive the last update, the "potting" material is soft when compared to the previous two generations of thermo ecu. Many TSB's on this one.
Also, this can definately be a ground problem. Buy some aerosol electric contact cleaner, go through all the connectors (we're talking major exorcism now), check the resistance value of the O2 sensors (less than 2 ohm), crack the sensors loose to remove corrosion, or replace, and/or add a separate ground strap (braided grounding wire) hose clamped to the body of the oxegen sensor.
I've encountered this many times and there is still one car that I hear about through the grape vine that still occasionally has this problem after believing it was fixed eight years ago. |
Jon Gwinn (95spider348)
New member
Username: 95spider348
Post Number: 8
Registered: 12-2001
| | Posted on Monday, November 25, 2002 - 11:31 am: | |
I replaced the ECU and the thermocouple for the bank. I have done the swapping, etc. and it's easier to simply replace the whole system. I too had the light flicker then it got to the point where I had no lights and no power to the bank - usually in stop and go traffic! A restart of the car and everything was fine. I ordered them through Sodacoms (may have gotten the last 2 ECUs!) and was satisfied with order time/delivery/quality. |
Dan Marlett (Ferrari_dan)
New member
Username: Ferrari_dan
Post Number: 36
Registered: 9-2002
| | Posted on Monday, November 25, 2002 - 10:40 am: | |
Thanks guys, I will check the connections.
Jon, What parts did you replace... the ECU for the thermocouple? ...or both the ECU and thermocouple? Every once in a blue moon I will have the 1-4 slow down light flicker on the dash so I am assuming from past experience that it is the ECU for the thermocouple. Where did you get the parts?
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JRV (Jrvall)
Junior Member
Username: Jrvall
Post Number: 177
Registered: 11-2002
| | Posted on Monday, November 25, 2002 - 9:51 am: | |
The AFM is the Air Flow Meters...one on each intake runner between the air cleaner & throttle housings....each has a wiring harness running to it held in place by clips (surrounds) moulded into the rubber intake boot. Usually the right side is the culprit....the harness vibrates more on the right from the way the wires dangle a little more than the left. with the engine idling jiggle the plug connectors and wiring harness to see if you can induce the cutting in and out. in rare cases I've seen a broken wire under the rubber weather boot. this is very common and the first place I always start looking for the problem you describe. If you see moisture or corrosion a carefull inspection with light & magnifying glass might be in order for all the plug in connectors in the engine compartment. Bent, loose, broken prongs are very common in the connectors on all late madel ferrari's.
Hope this helps. |
Jon Gwinn (95spider348)
New member
Username: 95spider348
Post Number: 7
Registered: 12-2001
| | Posted on Monday, November 25, 2002 - 9:46 am: | |
This sounds like the ECU/Thermocouple issue. I have replaced the 5/8 bank already (same symptoms that you mentioned) and I have the parts ready for the 1/4 bank. Common problem that will get progressively worse until replaced. |
Dan Marlett (Ferrari_dan)
New member
Username: Ferrari_dan
Post Number: 35
Registered: 9-2002
| | Posted on Monday, November 25, 2002 - 8:51 am: | |
JRV, what exactly is the AFM? Where is it located? I am assuming that there are two, one for each bank of the engine. |
Dave Penhale (Dapper)
Member
Username: Dapper
Post Number: 363
Registered: 4-2002
| | Posted on Monday, November 25, 2002 - 6:59 am: | |
I don't get this problem but if I ever do - AFM? Air/Fuel module, Auto fuelling module |
JRV (Jrvall)
Junior Member
Username: Jrvall
Post Number: 176
Registered: 11-2002
| | Posted on Sunday, November 24, 2002 - 9:27 pm: | |
A loose plug-in connector on an AFM is very common. Remove both plugs, inspect carefully (if you see or suspect a loose pin connector tighten), clean as neccesary and reinstall. |
Dan Marlett (Ferrari_dan)
New member
Username: Ferrari_dan
Post Number: 34
Registered: 9-2002
| | Posted on Sunday, November 24, 2002 - 9:04 pm: | |
Occasionally when my 348 is cold it will run on 4 cylinders. It looses power, however it sounds like it is running fine. No "dummy" lights come on. It only happens when the car is cold and only about 15% of the time. When this problem occurs this is what happens: Driving down the road and loose power; shift gears and still the same lack of power; put the clutch in and the car stalls; restart and the car is fine the rest of the day. Is this a ground problem? If so what do I clean or check? Is this a computer problem? Is there anything I can do to diagnose the problem? I've read all the posts pertaining to this; however, nothing seems to jump out at me.
Thanks in advance!
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