Exhaust ground wire??? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Brandon240sx · 03-20-2018, 07:15 PM

While under my car trying to get my tranny in, I noticed a ground on my heat shield. The wire looks like it was cut. Anyone have any idea what this was for? Just curious. Seems like an odd place for a ground

majgoldfish · 03-20-2018, 07:33 PM

There are several other grounds like this on the underside of the car, I would reconnect the ground. Nissan wouldn't have spent the money to put it there unless there was a good reason.

Brandon240sx · 03-21-2018, 12:58 AM

Quote:

Originally Posted by majgoldfish

There are several other grounds like this on the underside of the car, I would reconnect the ground. Nissan wouldn't have spent the money to put it there unless there was a good reason.

I would if I knew what it was from lol

Kingtal0n · 03-21-2018, 08:27 AM

It might have been for the oxygen sensor. Usually exhaust is touching engine and can ground this way, however there may be some kind of rubber isolation in the area(s) where oxygen sensors are installed. I can't see the ground having much to do with any of the other in car electronics. It might also just be acting as an electron "drain" of sorts, keeping the exhaust the same potential as the rest of the car to prevent some kind of buildup. I know from reading physics book that some race cars generate enough of an electron buildup in their chassis/tires to come back to the pits and cause a huge spark from the discharge, igniting fuel and causing mayhem etc...

03-20-2018, 07:15 PM	#1
Brandon240sx Zilvia Member Join Date: Aug 2017 Location: Long Island, NY Posts: 156 Trader Rating: (0) Feedback Score: 0 reviews	Exhaust ground wire??? While under my car trying to get my tranny in, I noticed a ground on my heat shield. The wire looks like it was cut. Anyone have any idea what this was for? Just curious. Seems like an odd place for a ground

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03-20-2018, 07:33 PM	#2
majgoldfish Join Date: Jan 2012 Location: Las Vegas Posts: 46 Trader Rating: (5) Feedback Score: 5 reviews	There are several other grounds like this on the underside of the car, I would reconnect the ground. Nissan wouldn't have spent the money to put it there unless there was a good reason.

03-21-2018, 08:27 AM	#4
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 38 Posts: 4,646 Trader Rating: (17) Feedback Score: 17 reviews	It might have been for the oxygen sensor. Usually exhaust is touching engine and can ground this way, however there may be some kind of rubber isolation in the area(s) where oxygen sensors are installed. I can't see the ground having much to do with any of the other in car electronics. It might also just be acting as an electron "drain" of sorts, keeping the exhaust the same potential as the rest of the car to prevent some kind of buildup. I know from reading physics book that some race cars generate enough of an electron buildup in their chassis/tires to come back to the pits and cause a huge spark from the discharge, igniting fuel and causing mayhem etc...