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decat oxygen sensor plug

da_gleadless

da_gleadless

New member
Good Evening Gents,

Right, well, the long and short of my problem is I need a wire out loop plug where the oxygen sensor used to be for a new decat I bought (see link-no affiliation) as the old one had a whole in it that developed last weekend.

decat 964

I tried to remove the one from my old decat, but its not moving, no way[:eek:]

I have the new gasket and nutsbolts to fit along with the O ring, but I need this part. does anybody know the size and/or where I can get one?

The car is off for new carpets and speaker/amp/stereo install on Saturday, so I would like not to put this off and get the part ASAP.

If anyone can help I would greatly appreciate it[:)]

Cheers Guys

2DCBF8B2AA7E4456B2614007EA8A649D.gif
 
If you don't put an oxygen sensor in the new de-cat you're going to have running/stalling/idling problems. You can't just unplug it and blank off the hole. If you go that route, I believe you need to make a wiring adjustment to the DME so that it's not looking for the sensor input. So if you can't get the old one out, you'd be better off buying a new one - a Bosch OE one is about £100.

The old ones are very difficult to remove but if you clamp the pipe on a workbench, soak it in penetrating oill and get a spanner and a breaker bar on it (trolley jack handle is good for this), it will come undone.
 
Cheers Steve,

I'm replacing a decat with another decat so the modification in the DME has already been done.

The one i had in place had a the hole blanked off, trouble is I cant get the plug out. So i need to know thesize oft eh blank plug or where to get one.

Do you think its better to replace the plug with the sensor, and is so, do you know how to retrofit the wiring in the DME?

Cheers Steve, appreciated[:)]
 
Having done LOTS of googling its an m18 x 1.5 blank off plug!

Also it seems the Lambda sensor is not required for a decat according to some posts on another forum quoting JZM.


Sorry I have answered my own question, but It did take alot of research[8|]
 
So I guess that the wiring mod was done before you got the car? It's normally evident as a white plug under the seat by the DME, that has a jumper wire in it. You'll see a pic of it in this thread:

http://forums.rennlist.com/rennforums/964-forum/227147-90-c2-disconnected-oxygen-sensor-fault-codes-and-part-numbers.html?highlight=oxygen+sensor

However, I'm not sure if just removing the jumper wire puts it back to normal allowing a sensor to be refitted.

Since it's been modified you could still put an O2 sensor in the cat hole to block it up but I guess spending a £100 is a bit extreme. As an alternative, I believe that the threads are the same as a large spark plug which could also be used to block the hole.....it won't give you any more power though [;)]
 
Yeah the decat was replaced by the last owner. I've seen the receipt for the decat itself (jasmine motorsport), but not noticed the receipt for the work.I'm going to have a look though as the car has a great history file (something I'm very proud of and maintain wtih a certain degree of 964 OCD).

I did happen across that thread on rennlist, along with this that settled my mind (its like having a very bloody child lol)with regards to leaving it out...

http://forums.rennlist.com/rennforums/964-forum/19955-de-cat-and-o2-sensor-bit-long.html

Though this was my next port of call if i decided to replace it...

http://forums.rennlist.com/rennforums/964-forum/208015-diy-oxygen-sensor-replacement.html

Its good to know these things in the long run i guess, but I start to worry terribly if I think something is out of place.
I eventually found the correct fitment and have one on order for next day delivery so a nice drive out to oxfordshire to C&N customs is still on for saturday :)

http://www.kamracing.co.uk/index.php/lambda-blanking-plug-m18-x-1-5.html

I really appreciate the help Steve, I think I owe you a pint at some point!
I've had the car just over a year now and I cant imagine my life without it[:D]
 
It took me a while to coin the term lambda blanking... but thats what did the trick!

I didnt even know about this before I tried to replace my decat lol, but you live and you learn!
 
isn't the jumper for altitude if i remember my old Rennlist conversations a few years ago, it takes the sensor out of the equation as there's also the warm up cycle to take care of when the car first fires up?

k
 
Ninemeister carried out the work.

The receipt shows :

Fit Cat Bypass
Remove Lambda Sensor
Fit Code Plug

Plus quite a bit more...

The work was carried out on 15/11/02 so the old decat only lasted just over 8 years!

I've finally got everything on and working... Just waiting for the Lambda plug and its all good to go!

Took me 3 hours[:)]
 
ORIGINAL: kevin

isn't the jumper for altitude if i remember my old Rennlist conversations a few years ago, it takes the sensor out of the equation as there's also the warm up cycle to take care of when the car first fires up?

k
Click to expand...

As I understand it (mostly based on Rennlist reading but not your thread Kevin) a 964 does not have an altitude sensor as standard but one can be fitted and used instead of a Lambda sensor. However, it involves some modification of the DME and I can't see why to choose that instead of Lambda as the latter is already taking care of monitoring the change in oxygen (which would occur in relation to altitude) by measuring the unburnt fuel in the exhaust.

The plug and jumper wire, again according to Rennlist, has positions to set the car up for USA/Japan or ROW emissions or no Cat. I presume the last position takes the Lambda out of the loop and fueling is then just dependent on throttle position. Sounds like Chris' car has been set up to work with no Cat and works fine but will probably be using a bit more fuel than it needs. My own car has no Cat but uses the Lambda, hence why I said if it was disconnected without doing the jumper mod, I would get idle hunting problems and the like (I've had these when a Lambda has died).
 
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