Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Brynjaminjones]

Yeah, it was the sensor I was on about. Cat is already on, but currently just using dead O2 sensor as a hole plug!

[Mike Pavelin]

The sensor in the cat just monitors cat performance. the one in the front pipe is used to determine fuelling.

[Yakko]

I've got the front sensor unplugged on my TJ (as it was running shit with it plugged in) while I wait for a replacement from RockAuto.

Strangely, there's no Check Engine Light.

[Dave69]

buy a sensor from bosch and fit the appropriate connection, obviously replace with the type that has the same number of wires

[Yakko]

I've read on a number of sites to specifically avoid Bosch O2 sensors on Jeeps. Something about the heater element being slower to react than the NTK part fitted at factory.

I've bought an OEM replacement from RockAuto, but it feels like its taking AGES to get here.

[Brynjaminjones]

Hmmm, sensor is replaced, but with where it's positioned it's pressing against the underside of the Jeep. This is clearly also how the old one snapped, as there are flat spots on the heat-shield above the cat.
I'm fairly sure that the wires will rub through in no time with it like it is. The only possible way around it that I can see would be to rotate the cat, but it's so firmly on there that I don't think I'd be able to without damaging it! Grrrr

[wildwood]

BFH and a block of wood.......and gently make some real estate for it!

[Brynjaminjones]

There seems to be a side-effect of the O2 sensor rubbing that I hadn't thought about - it transfers every vibration from the exhaust to the floorboards of the Jeep!
I'm going to have to sort it tomorrow.


Without wanting to sound stupid, what is the best way to remove and reposition/rotate my new cat without having to damage anything? It took hammering to get it on there, but obviously there's not really anywhere to get any good purchase on it to hammer it back off!
Are there any tricks?

[JamesH]

Hammering where possible, grabbing, twisting. I have also levered my cat away from the floor with a massive bar but I'm not sure that it is advisable, I think it probably bent the floor and exhaust.

[Brynjaminjones]

Perseverance seems (unfortunately) to be the name of the game!

[Brynjaminjones]

Sorting it out was easier than anticipated. As expected, I had problems with the whole exhaust system moving when I tried hammering the cat off, so I wedged a block of wood between where the downpipe meets the cat and the floor of the Jeep, and then put a ratchet strap around the downpipe hanger and the tranny crossmember.
This did a good job of securing everything, and the cat then hammered right off with a chisel!


I've now put the cat back on at an almost 45 degree angle so that the sensor doesn't hit anything!

[JamesH]

Skills are advancing young Jedi, before long you'll be tig welding cages and swapping a electrickery V8 in. Good work.

[wildwood]

Well done....... Having the courage to get stuck in is the main hurdle.......nowadays the Interweb or YouTube is sometimes the second stage of getting the hammers out.

So?? Sensible offroading at CF?? Or red mist and rag it???

[jay140285]

Red mist young Bryn. Just follow me you will be fine!


Sent from my iPhone using Tapatalk

[bigjeepzj]

you follow