| Author |
Message |
Heiko (Hgparts)
New member
Username: Hgparts
Post Number: 13
Registered: 3-2003
| | Posted on Sunday, March 16, 2003 - 2:18 pm: | |
hi
most of the time it�s the cat ecu on the back that brings up the wrong temp thats why the light comes on you can replace this then the problem is gone when you need it contact me
heiko
hgparts |
Ernie Bonilla (Ernie)
Member
Username: Ernie
Post Number: 591
Registered: 11-2001
| | Posted on Sunday, March 16, 2003 - 12:33 pm: | |
Rob and JRV
No hard feelings taken. Yeah it is nice to know if there are other issues with the electrics on the car. Because we alllllll know how bad the wiring in these cars are. |
mike Vettraino (348tb)
New member
Username: 348tb
Post Number: 6
Registered: 2-2003
| | Posted on Sunday, March 09, 2003 - 6:21 pm: | |
Turn engine off,wait a feu, start again problem solved.. |
JRV (Jrvall)
Intermediate Member
Username: Jrvall
Post Number: 1101
Registered: 11-2002
| | Posted on Sunday, March 09, 2003 - 4:30 pm: | |
>>Woooaaaah take it easy guys<<
Whoooaa Ernie,
Like Rob, I wasn't trying to slight your help in the least. I fully agree with you that too many people get ripped off, otherwise I wouldn't be here myself pitching in a lending hand to "stamp out Fraud" and fradulent diagnostic practices.
The flip side like Rob mentions is going at problems blindly...
you offered a good tip...unplug the Temp Probe ECU...see what happens...cheap and easy enough...but it's also nice to know "if" something caused the problem, or if it just layed down.
|
Rob Schermerhorn (Rexrcr)
Member
Username: Rexrcr
Post Number: 331
Registered: 11-2002
| | Posted on Sunday, March 09, 2003 - 4:05 pm: | |
Ernie, I mean no ill will towards you and appreciate your experiences, I know you're just trying to help.
It's just been my experience that "plug and chug" new parts into the system blindly persuing something that may not be the issue gets expensive quickly, too.
If one has a donor car, I guess one can change out a couple components in an attempt at cheap fix, but that's also why I suggested searching the archives, 'cause the easy stuff is already outlined there.
I've seriously been considering starting an FAQ just for this reason, the same issues come up frequently enough. But it'll take hours to compile. I can't justify the time now, though I know it will save other's time.
Don't suppose RobL can put me on the FChat payroll to help offset the time, there probably isn't one at all now, or in the future.
Ohh well, we just keep plugging along. Sorry I came across soo harshly,
Rob |
Ernie Bonilla (Ernie)
Member
Username: Ernie
Post Number: 586
Registered: 11-2001
| | Posted on Sunday, March 09, 2003 - 2:49 pm: | |
Woooaaaah take it easy guys. I'm not claiming to be a mechanic, just passing along my thoughts from personal experiance. I'm just trying to give him some advice to save him money. I don't see the need to be charged a diagnosis fee of $100-120 per hour if he can get the same info here for FREE! I feal Ferrari owners are relentlessly ripped of and this is my way of fighting it. As for you guys I think it is great that experts such as yourselves, come here and give people advice and guidance. |
JRV (Jrvall)
Intermediate Member
Username: Jrvall
Post Number: 1098
Registered: 11-2002
| | Posted on Sunday, March 09, 2003 - 12:22 pm: | |
>>If a client dropped this car on me, and I had no history, this is my problem solving methodology: <<
Agree with Rob on this. Proper Methodology & Sequence is very important in trouble shooting.
Sure one can look at a few of the 'most likely suspects' first. But that won't tell you the Big Picture as to the rest of the system conditions..it is not uncommon to have more than one problem that should/can be addressed. |
Rob Schermerhorn (Rexrcr)
Member
Username: Rexrcr
Post Number: 329
Registered: 11-2002
| | Posted on Sunday, March 09, 2003 - 12:10 pm: | |
Ernie, I appreciate your experiences, though there are other causes to this symptom other than the two you point out. This is why we need more information.
If a client dropped this car on me, and I had no history, this is my problem solving methodology:
1) Download trouble codes, all of them, write 'em down or print 'em out
2) Troubleshoot specific error codes stored
3) Clear the memory(s)
4) Hook up SDI, or multimeter and oscilloscope, and check for proper sinusoidal output of Lambda sensors
5) Pin test resistance in Lambda circuit wiring (very sensitive, must be at or below 2W)
6) Inspect thermo ECU's, update as needed
7) Clean grounds, clean all pin connectors
8) Check for charging system updates, eliminate old-style plug disconnect, convert to rotary switch disconnect
Failing all the above common errors, complete pin test of all circuits, check output of all sensors. |
Ernie Bonilla (Ernie)
Member
Username: Ernie
Post Number: 585
Registered: 11-2001
| | Posted on Sunday, March 09, 2003 - 11:49 am: | |
Ts348
The 5/8 light means that the cat on those bank of cylinders is getting too hot. The reason is feals like your cars is running on 4 is because it is. The ECU shuts down one bank so that 1) the cat doesn't get fried and 2) doesn't start a fire from being too hot. All you have to do is just unplug them and it will not shut the banks down. How ever if there really is an issue with the cats, you run the risk of burning them up, but I'm sure you know that already. But seeing as you have replaced them with new ones, I would go with what was mention before, and check the couplers. This is a very common problem with the 348's, I know cause I had the same problem with mine. It is either one or the other. If that doesn't solve your problem then the car could be running too rich. Hope this helps. |
Rob Schermerhorn (Rexrcr)
Member
Username: Rexrcr
Post Number: 328
Registered: 11-2002
| | Posted on Sunday, March 09, 2003 - 11:44 am: | |
So, what's the history? As Frank says, there are issues with catalytic converter thermocouple ECU's (the newest version, you can press your finger nail into the potting material). Not to be confused with the engine's ECU's on the firewall behind the seats, these are located on the spring/shock support towers, two connectors, one leading to the thermocouple on the cat, one going into the main wiring harness. If the potting material is hard, and/or pulling away from the housing, may be faulty. A dealer can test these. They're kinda pricy, so I wouldn't just change them out as a guessing game.
Ground fault issues will do this too.
Like I stated previously, check the archives, lot's of stuff you can do yourself for cheap before investing in new parts.
It is helpful to know what error code is stored in the ECU's, each bank, too.
Let us know what you find. |
Ts 348 (Ts_348)
Junior Member
Username: Ts_348
Post Number: 80
Registered: 3-2002
| | Posted on Sunday, March 09, 2003 - 11:29 am: | |
Rob I dont belive so I think you may be mistaken |
Rob Schermerhorn (Rexrcr)
Member
Username: Rexrcr
Post Number: 327
Registered: 11-2002
| | Posted on Sunday, March 09, 2003 - 10:55 am: | |
ducati 916,
Is this you??:
quote:hello do you got a 348 challenge car? also a ferrari chat member
my 5/8 light comes on some times and it feels like its running on 4cyl's i alredy repalcted the ECU's what elas could it be? and 2nd is real hard to get into when the car is cold
I am in INDY Im a cadillac Tech i changed ECU's with OME ones I had the car at Lake forst Sports cars and they told me that was the problem but guess not but from searching older trend's I think im just going to unplug them
If so, I sent you an email to call me with my phone number just now, I can help. If you're not the same guy, I need much more information. Have you searched the archives? There's tons of information on this.
Thanks,
Rob |
Frank Parker (Parkerfe)
Intermediate Member
Username: Parkerfe
Post Number: 1924
Registered: 9-2001
| | Posted on Sunday, March 09, 2003 - 10:53 am: | |
Cat on that side could have failed and caused the cat ECU to shut down those cylinders. Or, the cat ECU itself could have failed. Disconnect the thermal coupler from the cat ECU and see if that solves the problem. If not, it could be the Cat itself or the main ECU. |
ducati 916 (Ts_348)
Junior Member
Username: Ts_348
Post Number: 79
Registered: 3-2002
| | Posted on Sunday, March 09, 2003 - 10:36 am: | |
91 348TS the 5/8 light likes to come on and feels like the car is only running on 4cyls |