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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 11-02-2009, 10:51 AM
symplered symplered is offline
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What's the drive cycle

Hey folks,
Last week my CEL came on soon after my fuel reserve light lite up. Can't think of the codes, however, the reading was " low fuel, engine misfire, and running too lean bank 1. After a few days the light went off. This weekend It fell emissions testing, the emission test computer had the same faults. It had about 48 miles post CEL. Does anyone knows the number of miles to be driven before the on board computer reset the codes? Thanks
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  #2  
Old 11-02-2009, 11:56 AM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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Normally, if the CEL light went off by itself, without you or someone else resetting the computer, the car would pass the emissions test. If the computer was reset, the drive cycle is anywhere from 50 to 100 miles of some city and some highway driving.

I own an emission station in the Alpharetta/Johns Creek area. Why don't you stop by and I'll give you a free diagnostic scan using my emission analyzer and tell you what is going on with your car.

Happy Birthday Emissions
9850 Nesbit Ferry Road
Alpharetta, GA 30022
Phone: 770-475-0422

I am open 7 days a week til 7pm. So call or stop by.
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  #3  
Old 11-02-2009, 01:21 PM
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dj330Ci dj330Ci is offline
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Carlson, My SES light has been on for about 3 weeks until I replaced the air filter this weekend. Light went off by the 3rd drive. I'm assuming I have no codes now and that the system reset itself?
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  #4  
Old 11-02-2009, 02:30 PM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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If the light went off by itself, that means the computer no longer thinks there is a problem, so yes, it will most likely pass. You just have to make sure the light actually went off but still works, and didn't burn out or lose the fuse.
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  #5  
Old 11-02-2009, 02:37 PM
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dj330Ci dj330Ci is offline
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Well unfortunately, on the way home this evening, light came back on. Back to the drawing board. Last time I got the code read it was too lean but only in bank 2 this time. This is a first because the two codes for banks 1 and 2 have always come on at the same time. I wonder what's happening. All parts for the air intake system are relatively new. New O2 sensors too.
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  #6  
Old 11-02-2009, 02:45 PM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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If you are sure you have no leaks in the intake system, maybe clean your MAF sensor. Maybe someone with more experience will chime in on this problem.
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The problem with common sense is that it's not very common.

2010 335i, ZSP, ZPP, M-Sport, Le Mans Blue, 3 pedals of course!
Heated Seats | USB & iPod | Black Dakota Leather
Cobb AP Stage 1 Aggressive + | Cobb FMIC | BMW Performance Exhaust



Previous BMWs:
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  #7  
Old 11-02-2009, 03:28 PM
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dj330Ci dj330Ci is offline
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Yep. MAF clean too. Any chimes from others are appreciated. :-)
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  #8  
Old 04-05-2012, 06:55 AM
import special import special is offline
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vac leaks

check for a leak at the oil seperator hose under intake manifold to oil dipstick tube
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  #9  
Old 04-05-2012, 07:12 AM
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P_T P_T is offline
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Quote:
Originally Posted by CarlsonTheFlyer View Post
Normally, if the CEL light went off by itself, without you or someone else resetting the computer, the car would pass the emissions test. If the computer was reset, the drive cycle is anywhere from 50 to 100 miles of some city and some highway driving.

I own an emission station in the Alpharetta/Johns Creek area. Why don't you stop by and I'll give you a free diagnostic scan using my emission analyzer and tell you what is going on with your car.

Happy Birthday Emissions
9850 Nesbit Ferry Road
Alpharetta, GA 30022
Phone: 770-475-0422

I am open 7 days a week til 7pm. So call or stop by.
Now there is a random act of kindness...Kudos Carlson
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  #10  
Old 04-05-2012, 07:14 AM
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P_T P_T is offline
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Quote:
Originally Posted by dj330Ci View Post
Well unfortunately, on the way home this evening, light came back on. Back to the drawing board. Last time I got the code read it was too lean but only in bank 2 this time. This is a first because the two codes for banks 1 and 2 have always come on at the same time. I wonder what's happening. All parts for the air intake system are relatively new. New O2 sensors too.
Although you said "All parts for the air intake system are relatively new.", since you have codes for both banks 1 and 2, this may suggest a small air leak in the intake elbow or there abouts.
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  #11  
Old 04-05-2012, 07:17 AM
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rgk330i rgk330i is offline
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Vacuum leaks, oh where to start, there are so many. A search will turn up many useful threads, but for starters:
- DISA valve gasket
- cracked intake boots
- cracked, melted, or burned vacuum hose along right side of valve cover
- deteriorating CCV hoses
- cracked plug on vacuum nipple on back of intake manifold against firewall

Some things to start with, anyway. I've had good success with an OBD reader and a laptop running a realtime graph of short-term fuel trim, while I stick an (unlit!) propane torch nozzle in various places around the intake side of the engine. When a vacuum leak sucks in some propane, the fuel trim drops way down, and the idle speed may briefly surge.

Do be careful not to blow yourself up. Set the torch on minimum flow.

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  #12  
Old 04-05-2012, 10:04 AM
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Nick77 Nick77 is offline
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You guys know you are replying to a thread from late 2009, right?

I sure hope he has it fixed by now!
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  #13  
Old 04-05-2012, 10:51 AM
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rgk330i rgk330i is offline
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Hmm, note to self... check dates first.

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