Jump to content
Sign in to follow this  
zero

cat deleted but engine light on

Recommended Posts

So I did a cat delete on my n46 engine a while back, and it threw a cat code.

It didn't bother me until today it dawned on me that the ecu is probably over fueling to compensate for what it thinks is a dead cat.

How do I fool the computer? Can I simply unplug the plug to the post cat sensor, or earth the plug, or join the wires together?

The sensor is just behind the cat (1) in the following pic;

http://realoem.com/bmw/showparts.do?model=EX52&mospid=47663&btnr=18_0452&hg=18&fg=10

Any help would be appreciated.

Share this post


Link to post
Share on other sites

What was the reason for deleting the cat ?

Share this post


Link to post
Share on other sites

What was the reason for deleting the cat ?

It was clogged, so I cut it out, removed the internals, and welded it back in.

It gave me slightly better revs.

Share this post


Link to post
Share on other sites

It was probably clogged with oil from your valve stem seal problem.... have you had this repair done yet ? I don't know of a cat delete program or "code out" option for an N46 and they also don't like after market cats...been there

  • Like 1

Share this post


Link to post
Share on other sites

I can delete the codes in the ECU so they won't come back, other way is a mini cat extension on the post cat sensor (call red line or check trademe)

Share this post


Link to post
Share on other sites

It was probably clogged with oil from your valve stem seal problem.... have you had this repair done yet ? I don't know of a cat delete program or "code out" option for an N46 and they also don't like after market cats...been there

No, I haven't had the valve seals done yet, but I've been saving up so I can get it done in the next 6 months.

Share this post


Link to post
Share on other sites

I can delete the codes in the ECU so they won't come back, other way is a mini cat extension on the post cat sensor (call red line or check trademe)

Yes after doing more research, extending out the sensor was what I was thinking might be my best bet.

I was thinking of using the spark plug defouler mod: http://www.amazon.com/Dorman-42009-Spark-Plug-Non-Fouler/dp/B000CO91FY

Looks like redline have something similar: http://www.trademe.co.nz/motors/car-parts-accessories/performance/exhaust/auction-862985203.htm

Which one do I need though, as they also have this: http://www.trademe.co.nz/motors/car-parts-accessories/performance/exhaust/auction-863460513.htm

Share this post


Link to post
Share on other sites

Id go the mini cat, i have no idea what codes you have as you havent posted any?

Share this post


Link to post
Share on other sites

The code I have is the one below;

http://upkeep.us/OBDII/OBD2/BMW/piart.php?art=2907

It says power steering control module, but thats using a cheap adapter and the torque app on my phone.

When I saw Glenn at BMW ltd a while ago he scanned it with his professional scanner and it brought up a cat code, but I cant remember which one.

I bought a cat sensor extension from redline and fitted it last night, but before I could do anything else I noticed a water leak under the car.

Turns out the water pump is leaking, and is the original one from 2004 (130kms), so I will be replacing that today before I go for a drive.

This is the sensor extension I bought;

http://www.trademe.co.nz/motors/car-parts-accessories/performance/exhaust/auction-862985203.htm

I figured for $25 it was worth a try.

Share this post


Link to post
Share on other sites

What a mission this has turned out to be.

The waterpump is tricky on the N42/N46 to get out as its connected to the back of the power steering pump and there is very little space to move.

And I couldn't get a new water pump until yesterday because of the Easter weekend.

Then I couldn't get the connector out of the old waterpump to put in the new one - its number 7 on this link;

http://realoem.com/bmw/showparts.do?model=EX52&mospid=47663&btnr=11_3192&hg=11&fg=35

In the end I had to carefully cut up the old waterpump to get the aluminium connector out.

In doing so I damaged the seals on the connector so went and got new ones which took a while as the first two places didn't have any in stock (repco, team mcmillan BMW).

Anyways, I got it in today and went for a test drive, and no leaks.

Back to the cat codes.

I have deleted the old cat codes, and over the next few days of driving we will see if it reappears.

Share this post


Link to post
Share on other sites

Done over 100kms of driving and the check engine light hasn't come on again, so fingers crossed.

Share this post


Link to post
Share on other sites

The water pump is run off the back of the power steering pump? yuck.

Share this post


Link to post
Share on other sites

The water pump is run off the back of the power steering pump? yuck.

Yea it was a pain to get off.

I had to use a different combinations of adapters, extensions and universals for each of the four torx bolts on the power steering pump.

Skinned a few knuckles lol.

Share this post


Link to post
Share on other sites

Well, its been a while and no check engine lights or codes thrown.

The $25 fix did the trick.

Thanks to all for the advice.

Share this post


Link to post
Share on other sites

Only if a bit late but have the whole set up sitting in the back room from when I did the engine swap water pump, thermostat, steering pump. As you have discovered a right pita to get at and even separate when in place.

Share this post


Link to post
Share on other sites

You don't separate them in place. You take them off together and separate on the bench

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...