O2 Sensor wiring accessability - ZR-1 Net Registry Forums

irpearce · 12-24-2014

Changed the left O2 sensor on my 91 - easy!
On the right I just cannot see how to access the three pin plug sandwiched in between the block and the front frame. I can barely see it let alone get my fingers in there and the loom doesn't pull out. Any suggestions please

mike100 · 12-24-2014

Pull off the k-frame brace for starters on the passenger side motor mount (don't worry, it doesn't hold up the engine, there's a tab welded to the frame you can't see that does that). I then proceeded to use long skinny flat bladed screwdrivers like chopsticks to manipulate the lock tab and popped it out. It just sucks- not much way around it.

Paul Workman · 12-24-2014

Yep...They're a bitch to get to - is why when I bought my SW headers, I located new bungs on the sides of the header collectors such that they're easy to access w/o jacking the car up. I set the bungs so that the O2 sensors angle very slightly upward to avoid being wiped off in case of bottoming out - which I have a little experience with

- and the sensors remained unscathed.

Z51JEFF · 12-25-2014

Quote:

Originally Posted by mike100

Pull off the k-frame brace for starters on the passenger side motor mount (don't worry, it doesn't hold up the engine, there's a tab welded to the frame you can't see that does that). I then proceeded to use long skinny flat bladed screwdrivers like chopsticks to manipulate the lock tab and popped it out. It just sucks- not much way around it.

Thats pretty much how you do it and anything else that works.Its been awhile but I think I took a long rod and a blob of sticky DUM-DUM,also known as seam sealer to get the connector started and then use a long screw driver to push the 2 connectors together but you do need to pull that frame section out.Oh,and to add to the difficulty,I did this in a one car garage with no room on the sides to climb under the car.

irpearce · 12-27-2014

Thanks mike100 and other contributors - job done. How difficult would it have been for the designers to add 3" to the loom and make it easy?

dmaclennan · 02-27-2020

How about removing the nut that attaches to the engine mount? OK?

Pic attached:

Young1 · 02-28-2020

Pull it out. The brace is a supplement to rigidity. Taking out the brace does not alter engine position.

12-24-2014	#1
irpearce Join Date: Dec 2014 Location: Cornwall UK Posts: 7	O2 Sensor wiring accessability Changed the left O2 sensor on my 91 - easy! On the right I just cannot see how to access the three pin plug sandwiched in between the block and the front frame. I can barely see it let alone get my fingers in there and the loom doesn't pull out. Any suggestions please

12-24-2014	#2
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: O2 Sensor wiring accessability Pull off the k-frame brace for starters on the passenger side motor mount (don't worry, it doesn't hold up the engine, there's a tab welded to the frame you can't see that does that). I then proceeded to use long skinny flat bladed screwdrivers like chopsticks to manipulate the lock tab and popped it out. It just sucks- not much way around it.

12-24-2014	#3
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: O2 Sensor wiring accessability Yep...They're a bitch to get to - is why when I bought my SW headers, I located new bungs on the sides of the header collectors such that they're easy to access w/o jacking the car up. I set the bungs so that the O2 sensors angle very slightly upward to avoid being wiped off in case of bottoming out - which I have a little experience with - and the sensors remained unscathed.

12-27-2014	#5
irpearce Join Date: Dec 2014 Location: Cornwall UK Posts: 7	Re: O2 Sensor wiring accessability Thanks mike100 and other contributors - job done. How difficult would it have been for the designers to add 3" to the loom and make it easy?

02-28-2020	#7
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 894	Re: O2 Sensor wiring accessability Pull it out. The brace is a supplement to rigidity. Taking out the brace does not alter engine position. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.