removing thermocouple on 355 ? 2.7

I removed mine on my 2.7 and have no problems. Mine was giving false readings and shuting down a bank of injectors. I have Hyper Flow cats no I'm not worried about a cat failure.

 

Removed from the converter and pluged the hole . We kept the plug in the back of the computer and just tie wrapped the wire out of the way.

 

Actually you don't have to remove the thermocouple. You can but you don't have to. The reason is because the thermocouple gets connected to the cat ecu, which is then connected to the Motronic ecu. The problem may be a bad cat ecu and not the thermocouple.

Here is what you do.

Swap the cat ecu's from side to side. If the slow down light jumps from one bank to the other then you will know it's the cat ecu that is bad. If the light stays on the same side then you will know it is either a bad thermocouple or that your cat is indeed getting hot. If you have access to a infrared temperature gun you can take the temperature of the cat on the side that you are getting the slow down light on, to see if it is indeed hot as compared to the other side. Or you can also do the same swap as you did with the cat ecu's, but you would swap the thermocouples. So after you swap the thermocouples the light then jumps, then you know its a bad thermocouple, and if it doesn't then you have a different issue with the cat truly getting hot, and should find the cause.

Now back to not having to remove the thermocouple. Like I was saying you can leave it in. All it does is plug into the cat ecu. Just unplug it from the cat ecu, or unplug the cat ecu from the connection going to the Motronic ecu. Know that when you unplug the cat ecu or thermocouple you will get a silent check engine light, meaning that the Motronic will store a code that says it is not getting a signal from the catalytic converter temperature ecu. You will still be able to drive the car, and the Motronic will not shut down the engine. Be warned though that if you are indeed getting a catalytic converter that is truly getting hot you will not know that it is and risk damging the cat, or worse your car via a fire.


Anyway, hope that helps.

 

Just because you have a high performance catalytic converter from HyperFlow, it is STILL a catalytic converter, and you are STILL subject to catching the cat on fire if you pour raw fuel into it when hot. I know this is a fact from personal experience!! Don't be deluded that you no longer have that risk like it was a test pipe... it's STILL a cat.

 

Pouring raw gasoline into *any* make or model of catalytic converter is probably not a great condition to allow going unnoticed for long periods of time.

I would humbly suggest for your own personal safety that you either install straight pipes (not my choice as I don't like the different aroma) or insure that you have working cat temp monitoring systems.

Likewise, I'd suggest that you install *any* model of automatic fire extinguisher into your engine bay.

Be smart about your fun.

 

Well then get rid of the stupid cat ecu's all together. Again, the Motronic will store a silent engine code (4121 if I remember correctly), but the car will run just fine. Also if you are running test pipes, and are still getting slow down lights, then it is for sure a bad cat temperature ecu/thermocouple.