My NGT Disaster

Step back for a sec. It's not one the worst day of your life. Just put the stock exhaust back on. Since the NGT is really loud, why not go with straight pipes? I'll cost you a few hundred bucks (USD).

 

Firstly, I wish the worse day in my life was just filled with car trouble!

Secondly, I cannot see why changing the exhaust would cause rough running and error codes (provided you plugged up the vacuum hoses that control the exhaust valves).

 

If having a very minor problem with your FERRARI is the worst day of your life, then you're doing pretty good.

Also, since you bought the system used, you can probably sell it for what you paid for it or at least pretty close.

Go put your stock exhaust back on, and shop around for exactly what you want. There are plenty of youtube videos to listen to for exhaust options on your 360.

Good luck.

 

...comparing to what some of the folks in your country are going through, your worst day is probably their dream day... The exhaust alone will not cause the problem you described, your garage forgot to plug something back in properly, maybe a Lambda sensor which is causing the ecu to go to a default fuel map...

 

1+

 

If this is one of the worst days of your life, you need some real problems. Perhaps you have the answer to Greece's fiscal mess.

Just put the old unit back on and have a better day, and/or check all the connections!

 

Something must have shaken loose or not plugged in correctly. Check and recheck installation procedure.

 

There are no sensors in the exhaust system beyond the cats. The only thing that could remotely cause a problem is the vacuum lines that operate the valves in the standard exhaust and even then these will only throw a code.

I suspect your rough running is due to another issue.

 

Try resetting battery switch. Could have poor contacts inside.
Or your "new" exhaust is full of someone else's bits of dead cat, partially blocking it...

 

Just a quick check. The RH thermocouple has a kink in the braided cable. You may have damaged it during the installation.

Slow down light is linked to cat temp.

Measure the resistance from the RH thermocouple ECU under the engine cover and check there is continuity.

 

PS was that the NGT that sold on eBay a couple of weeks back?

 

Mike, I don't know enough about how the cat temp ECU interfaces with the system. It was just something that showed in the picture and is linked to the 'slow down' warning.

As Voicey said earlier the exhaust valves are not used on this system so have you capped the ends of the vacuum pipes that feed them? Otherwise there will also be an air leak downstream of the MAFs as the vacuum feed comes of the inlet plenum.

 

i run the NGT with Fabspeed straight pipes...Ive been running it for a year without any problem and I love the sound - especially above 5000 rpm. nice little performance gain too!

As everyone said, your problem is almost certainly related to an error during installation that is not related to the NGT set up. I would also find that kink in the TC wire highly suspect. In fact, if they are original (color is yellow vs. blue I think) then its high time that they were changed anyway. Also the ECM design isnt the greatest and they can fail as well - moving things around during install likely gave a brittle part the necessary encouragement to fail and now it is showing its wear.

I would troubleshoot the basics before going to the trouble of putting the stock exhaust back - these cars just require that extra level of attention with any move you make.

good luck!

 

If you leave the valves uncapped you will have a cel and an excessive self-learn adaptive value. If your tech says this is not the case it's likely to be an electrical (battery v+ or cut off resistance issue) problem. I doubt a kink in the heavily shielded exhaust temp sensor would result in this fault, for a start an issue here would cause at least, a slow down, 4 dead cylinders( without any kind of smoke!) and likely a CEL.
It sounds like poor diagnosis of a simple problem......

 

He got the slow down light post set up. While the kink alone wont cause a fault (maybe) if those parts are old and they were moved around, the heat makes them brittle enough to break and cause a fault. Reading the CEL should show what threw the code....and that should narrow it down to this being the cause or something else. They are at the very least problematic and prone to failure.

I agree he should block the vacuum hoses to avoid a CEL but the slow down light wont cause that. Plus if it blinks I don't think it shuts down the cylinder bank like you describe. With my own experiences, it was the solid slow down light that caused that effect.