Metal Substrate Catalytic converter failure

[BLACK 346]

Has anyone had a metal cat fail on them, be it from age or hitting speed humps etc? I am getting a rattle from under the car in this area on
acceleration and even worse when under load. Have had it up on the hoist and given them a wack but cannot hear anything loose inside. Also cannot
see anything else in the vicinity that would be making this noise.

[Micks]

Rod I haven't but I wouldn't risk driving it until you get em both pulled out & checked that they are sound. Have read on occasion when substrate loosens can be induced back into the engine! You can do without that!!

[white lie]

As Micks said, I've also heard of it being sucked back in to the engine.

Not something like the exhaust slightly rubbing somewhere though is it? Engine mounts all good?

[BLACK 346]

As Micks said, I've also heard of it being sucked back in to the engine.

Not something like the exhaust slightly rubbing somewhere though is it? Engine mounts all good?

Will get these things double checked asap. Will probably take it into an exhaust shop and get them to pull the cats off and have a look, then they can
replace them on the spot if necessary. Cheers

[Micks]

Any update on your Rattle mate?

[BLACK 346]

Any update on your Rattle mate?

Not yet Mick. Spoke to Brad on Friday and he is going to get the car in early next week rather than take it to an exhaust shop. Did however do a plug change yesterday
arvo just on the off chance the car had a dodgy plug, and found the plug on number 5 cylinder to be quite loose (I reckon I could nearly have removed it without the socket).
Not sure if this would have caused any of the issues I have been having nor explain the noise, but something rectified non the less.

[BLACK 346]

This car is doing my head in. Took it for a drive to Hahndorf today. Drove real nice for the trip up the hills. Had some lunch and the Old Mill and was sitting there thinking
maybe it was that loose plug. No, no, no, no, no, half way out the car park heading home and my old mate the engine light comes on with associated chimes :(
Drove home ok, but idling rough at each set of lights when we get to the city. Then when I rev it hard blowing blackish smoke out the exhaust. Got it in the shed and read
the codes, fcku me if it aint that Brake pressure sensor code again. Brad could not work out why this was coming on even as it is supposed to be integral to AFM which is
totally disabled in the tune and all hardware removed.4989

[Micks]

Hi Rod ask Brad if he can suppress that code to mil, that way the fault will log but won't produce the Check Engine fault illum on cluster.

[BLACK 346]

Hi Rod ask Brad if he can suppress that code to mil, that way the fault will log but won't produce the Check Engine fault illum on cluster.

Hey Mick, yeah we did discuss turning it off, but concerned that this will just hide the problem.

[Micks]

Sure Brad knows his stuff & will set it right for you.
Speaking of Hahndorf me & the wife spent a day there on a trip to SA many years ago, what a lovely place :yup:

[BLACK 346]

Sure Brad knows his stuff & will set it right for you.
Speaking of Hahndorf me & the wife spent a day there on a trip to SA many years ago, what a lovely place :yup:

Yes Mick, it is a nice town, gets stupid busy on weekends though :)
Not so sure on Brad working out this code, I think he might be at wits end as well. Probably moved his workshop so I can't find it lol.

[Micks]

I wonder if we are are chasing a small vac leak here, as I can't really see the new LSA FI causing the brake vac switch fault?
I think everywhere is stoopid/crazy of a weekend! Reason why Mick rarely ventures out in it :lol:

[BLACK 346]

Possible I guess Mick. The hose that runs from the
booster to the top of the Throttle body is 3 pieces and
has small cable ties where it joins

[BLACK 346]

Still haven't had the car back to Brad yet (due to needing car), but I am convinced every issue I am experiencing with this car bar the rattle underneath is related to TC. I have driven it all week with TC disabled and it has not put a foot wrong. I can turn TC on at the lights and it will instantly start idling all over the place. It was something I was really trying to avoid,
but I may end up having to reach out to another tuner (as suggested by ED in PM ;) ) to see if this issue can be sorted. Driving with TC disabled all the time just isn't a good enough
solution in my opinion. The rattle underneath is another story all together, I am starting to think that could be the flex plate in the transmission, which is apparently a trans out job
just to diagnose. On a brighter note, finally got to the bottom of an annoying oil leak this morning. My good mates at UT Prospect found the O ring in the dip stick was leaking down
the side of the motor, not an easy one to find with all the oil spraying around, so glad that is sorted as I hate cars that leak oil.

[BLACKVE]

Still haven't had the car back to Brad yet (due to needing car), but I am convinced every issue I am experiencing with this car bar the rattle underneath is related to TC. I have driven it all week with TC disabled and it has not put a foot wrong. I can turn TC on at the lights and it will instantly start idling all over the place. It was something I was really trying to avoid,
but I may end up having to reach out to another tuner (as suggested by ED in PM ;) ) to see if this issue can be sorted. Driving with TC disabled all the time just isn't a good enough
solution in my opinion. The rattle underneath is another story all together, I am starting to think that could be the flex plate in the transmission, which is apparently a trans out job
just to diagnose. On a brighter note, finally got to the bottom of an annoying oil leak this morning. My good mates at UT Prospect found the O ring in the dip stick was leaking down
the side of the motor, not an easy one to find with all the oil spraying around, so glad that is sorted as I hate cars that leak oil.

Crap hope you get it sorted, those annoying things do take the fun out of it.

[BLACK 346]

Crap hope you get it sorted, those annoying things do take the fun out of it.

Thanks mate and yes it does take the gloss of things.

[BLACK 346]

Speaking to Brad again and he reckons only way ahead is small stally (around 2200), as motor with Cam and blower is pushing against converter and messing with torque reduction when TC is activated.

[Micks]

It does make a lot of sense Rod as most LSA's run an oem baby cam, which normally wouldn't be an issue with the A6.

[BLACK 346]

It does make a lot of sense Rod as most LSA's run an oem baby cam, which normally wouldn't be an issue with the A6.

Not sure, but I think the factory LSA run a different converter to the non supercharged cars? That combined with a less aggressive cam would probably be the difference.

[Micks]

Not sure, but I think the factory LSA run a different converter to the non supercharged cars? That combined with a less aggressive cam would probably be the difference.

Yeah mate general rule of thumb greater the cam in auto greater the stall so you know what's next....