ZCar Forum banner

Status
Not open for further replies.
1 - 4 of 4 Posts

·
Registered
Joined
·
107,695 Posts
Discussion Starter #1
I was looking under my friends hood the other day and noticed that the o2 sensor wasn't connected to anything, and hadn't been in a long time. The connector was rusted and there was no other wire within reach to connect it to. There was one unconnected white/black wire coming out of a harness near the coil that had the correct male connector, but came a few inches short of reaching the o2 connector.

Can anyone tell me if this is the right wire, or describe where the correct wire comes from? I'm sure a disconected o2 sensor would have an impact on performance, no?
 

·
Registered
Joined
·
787 Posts
It should come off the harness that contains the wires going to the injectors. It should have 6 injector connectors, 1 cold start vlave connector, 1 air regulator connector, 2 grounds, 1 throttle position switch connector, 1 going to distributer, 1 going to thermotime switch, 2 barrel type connectors going to a device under the air regulator, and 1 wire blade type going to the o2 sensor. that's how it is on my 83 na.

hope this helps you out.

> I was looking under my friends hood the
> other day and noticed that the o2 sensor
> wasn't connected to anything, and hadn't
> been in a long time. The connector was
> rusted and there was no other wire within
> reach to connect it to. There was one
> unconnected white/black wire coming out of a
> harness near the coil that had the correct
> male connector, but came a few inches short
> of reaching the o2 connector.

> Can anyone tell me if this is the right
> wire, or describe where the correct wire
> comes from? I'm sure a disconected o2 sensor
> would have an impact on performance, no?
 

·
Registered
Joined
·
107,695 Posts
Discussion Starter #3
The O2 sensor was not used on Z cars until 1981. If you have one on a 1978 it is my guess that either the engine or exhaust manifold came from a later car. There will be no wire to hook it too on your '78 and thus, will have no effect on performance. Make sure all of the connectors RUSS'83 mentioned are clean, as dirty connectors will fool the computer and affect performance.

> It should come off the harness that contains
> the wires going to the injectors. It should
> have 6 injector connectors, 1 cold start
> vlave connector, 1 air regulator connector,
> 2 grounds, 1 throttle position switch
> connector, 1 going to distributer, 1 going
> to thermotime switch, 2 barrel type
> connectors going to a device under the air
> regulator, and 1 wire blade type going to
> the o2 sensor. that's how it is on my 83 na.

> hope this helps you out.
 

·
Registered
Joined
·
107,695 Posts
Discussion Starter #4
> The O2 sensor was not used on Z cars until
> 1981. If you have one on a 1978 it is my
> guess that either the engine or exhaust
> manifold came from a later car. There will
> be no wire to hook it too on your '78 and
> thus, will have no effect on performance.

Thanks, as that is probably the case. The car was originally from Arizona and everything was disconnected or rigged up in some weird way. I never worked on a Z before '81 so I didn't know the O2 sensor wasn't used. Had us stumped there for a while.
 
1 - 4 of 4 Posts
Status
Not open for further replies.
Top