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Discussion Starter #1
Hi everyone I need some help/advise!

Had tubi exhaust installed few weeks ago on my stock 2000 M5 with 25K miles on it. But I just got my car back due to additional mods cosmetic stuff. So this is the first time I get to test the car with tubi and had the following problems:

1. The car was fine initial from a cold startup. Normal/plenty of power during acceleration.

2. Once it got warmed up (approx 5 minutes), it started losing power on acceleration, and LOTS of it. The engine growled loudly but it's like driving on less than 200HP!

3. Once stopped I smell something was burned, either rubber, plastic, or something.

Some notes:

When I got the car back, there was a SES light. Peake tool had the code of DM-TL. I reset it and it didn't show anymore on subsequent driving tests.

The shop that installed my tubi told me they did leak test and there was no leak. They did not weld either.

The shop told me they did use 89 octane gas to fill 5 gallons worth of gas before....

Then I took to a muffler specialist shop, and they said no leaks with visual inspection, but they suspect it's the cats after driving around the block, and recommended replacement (ouch!) They say it could be bad/excessive fuel from the engine...

I had AA CAI and IATS reloc kit installed way before tubi install, and the car was fine (and had a little more punch).

I followed MAFS cleaning procedures posted here just to be sure.

I didn't think O2 / MAFS sensors were the problem since the first 5 minute of driving was great - until the engine warmed up.

So I'm stuck. If it is just cats replacement, and needing to TIG weld the tubi, then I'll plunge $$ to do so. I'm just afraid that's not all!

Anyone with similar experience can comment?

thanks.
 

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based on the comments given and the nature of the m5's S62 engine..sounds like a camshaft position sensor has let out. I would suggest that you take it to a dealer for proper judgment.
 
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Sorry to hear of the recent problems. Getting the Tubi welded-up is always a good idea. The Tubi is a pretty benign modification, and can't really do any harm, however, due to it being more free-flowing than the OEM mufflers/resonators, some of the M5's sensors such as the O2 (Lambda) and CPS, sometimes exhibit their end-of-life symptoms more readily.

Cheers, Daniel.
 

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SandBeast said:
3. Once stopped I smell something was burned, either rubber, plastic, or something.
Good chance the smell is benign. The Tubi reeks for 2-3 weeks after installation; you'll notice the smell after parking the car and getting out. The smell slowly dissipates and goes away completely.

BTW, the cats should not be going bad at only 20k miles, and they're warrantied for 8yrs/80k miles. Good luck
 

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Discussion Starter #5
Thanks for all the response. I think I'll take into the dealer for a judgement.

Speaking of stealers, I mean dealers, does anyone know of a reasonably priced dealer around SF bay area? They all seem to have the $150 per hour, $150 minimum diag fee tag. Being a BMW CCA, 10% is the maximum discount, which still ends up at $135. grrrrrrr
 

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I too just installed the Tubi about 4 weeks ago and the smell you refer to has faded for me. As for power loss, I experienced a very slight power loss, but the car now seems back to normal after about 500 miles. As for your significant power loss, my past problems have been cam shaft sensor or mass air flow sensor. Seems highly coincindental to coincide with the Tubi install, but you never know.

TripleD
 

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Yeah I was expecting some sort of oder from Tubi as a new install per this board, and I do smell something. However, there is also a strong smell of rubber/pastic melts, which I didn't think it was tubi... Can anyone articulate how tubi suppose to smell like?!? it is supposed to be "burned" smell?
 

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Mine really wasn't a burning smell, but more of the smell relating to being brand new. You could just tell it smelled like that brand new being used smell. Hope this makes sense. Chances are it's not touching anything underneath as it's a very tight fit.

Give it a week or so and it should dissapate.

SandBeast said:
Yeah I was expecting some sort of oder from Tubi as a new install per this board, and I do smell something. However, there is also a strong smell of rubber/pastic melts, which I didn't think it was tubi... Can anyone articulate how tubi suppose to smell like?!? it is supposed to be "burned" smell?
 

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SandBeast said:
However, there is also a strong smell of rubber/pastic melts, which I didn't think it was tubi... Can anyone articulate how tubi suppose to smell like?!? it is supposed to be "burned" smell?
I guess you could describe it that way, and the smell is strong right after installation. strong enough to completely stink-up a 3-car garage w/14' ceiling, at least in my case. (e.g., the you-wouldn't-want-to-be-in-there-with-the-doors-closed, kinda stink)
 
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