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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Wed, May-16-2012, 01:02:10 AM   #11
reidnez
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Default Re: Smog saga...any help appreciated

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Originally Posted by haus View Post
Check the underside of your intake boot carefully. If it's original there is a 2-3" crack in it allowing unmetered air into the engine. I'm surprised you're not throwing any codes with numbers like that. You tested codes with a Peake scan tool and not some random OBDII reader at a non-BMW shop, right? My Peake reader came up with a TPS code that did not appear in Torque.
Thanks for the advice, I'll check into this as soon as I have time! I don't personally own a code reader, I have no idea what the shops I've taken it to are using. Tomorrow it's going to a BMW specialist so we'll see what they say.
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Old Wed, May-16-2012, 01:08:22 AM   #12
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Default Re: Smog saga...any help appreciated

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Originally Posted by FNS_M3 View Post
Did you get the car fully warmed up before smogging? Take the car on the freeway and drive in 4th gear to get the cats nice and hot, then drive straight to the smog station and try and get it done before the cats cool down too much. It's never failed for me but YMMV.
Unfortunately I tried this before...I ran it hard for about 30 minutes on my way to the smog shop, and called ahead to make sure they would put it on the dyno and run it right away (they did). I didn't even shut it down when I got there. No dice, still failed badly. I think this trick might work if I were on the edge, but the hydrocarbons are stratospheric...too much for the cat to handle (whether it's intact or not.)

Last edited by reidnez; Wed, May-16-2012 at 02:29:59 AM.
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Old Wed, May-16-2012, 01:10:17 AM   #13
reidnez
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Default Re: Smog saga...any help appreciated

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Originally Posted by englishtom1596q View Post
maybe if you had a code for o2 sensor and drove it for awhile running rich you killed your cats. and now you've fixed the o2 sensor so your not getting codes but the cats aren't doing they're job. and our cars would no way pass smog without cats, from my understanding our cars are not that efficient. however on the s54 i have heard of people passing smog with no cats due to good tuning.
Seems like a possibility, but again I still suspect a problem upstream in the fuel system; that unburned fuel (especially in such high quantities) should not be making it to the cats in the first place.
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Discussing Smog saga...any help appreciated in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)