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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-15-2013, 09:17 PM   #21
wildirish317
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Your Dad is an artist. No problem with that, but he's not a mechanic. First get a code reader, such as PASoft, it will help you figure out exactly what's wrong. Second, get rid of the CAI, it's not helping. Go back to stock. BMW produced a performance car, no need for performance add-ons. If you want more hp, do an engine swap for an S54 or a Chevy LSx.

Don't replace the O2 sensors just because you get an O2 sensor code. If you clear the code, and it keeps coming back imediatly, then you can replace them. I had an issue that threw O2 codes, but it turned out to be something else.
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Old 06-15-2013, 09:31 PM   #22
diM3tri
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Quote:
Originally Posted by wildirish317 View Post
Your Dad is an artist. No problem with that, but he's not a mechanic. First get a code reader, such as PASoft, it will help you figure out exactly what's wrong. Second, get rid of the CAI, it's not helping. Go back to stock. BMW produced a performance car, no need for performance add-ons. If you want more hp, do an engine swap for an S54 or a Chevy LSx.

Don't replace the O2 sensors just because you get an O2 sensor code. If you clear the code, and it keeps coming back imediatly, then you can replace them. I had an issue that threw O2 codes, but it turned out to be something else.
The fact that I'm getting such poor gas mileage and having the code kinda makes me skeptical. I think I'm gonna do plugs first tomorrow then see if the SES goes away. Ill put the stock air filter back on and see what happens
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Old 06-15-2013, 11:38 PM   #23
Tbone8ty
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CAI always throws CELs
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Old 06-15-2013, 11:40 PM   #24
diM3tri
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CAI always throws CELs
Surprisingly MAF wasn't a code I was getting even though its completely removed. I just got o2 sensors and some a/c circuit board thing. Plugs I'm doing just for fun. Haha
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Old 06-16-2013, 01:10 AM   #25
NumbaOneNewb
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CAI dont always throw error. I made mine going off a DIY somewhere on this forum. piped tubing from maf all the way down by left fog light. no issues for a year now.

im really surprised you arent getting a light for maf. thats so odd. now if you dont have maf on, them how does your system run efficiently without knowing how much air is entering? I know that when maf is disabled, the dme runs off preset mappings, but that should severely impact mpgs and performance. the dme can no longer make adjustments to the car seeing as it is like being blind.

now Im also suspecting now that maybe its related to your o2s error. I always thought the pre cat o2s measure how well the engine is burning up its mixture, informing the dme so that it could make adjustments. if the o2s are working but try and report that the car isnt being efficient, all its doing is reporting to deaf ears.

when my maf started acting up, it didn't throw a maf code either. it told me my o2s were shot, but at that time I was having other issues as well butt yeah, I never got maf errors
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Old 06-16-2013, 01:15 AM   #26
diM3tri
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Quote:
Originally Posted by NumbaOneNewb View Post
CAI dont always throw error. I made mine going off a DIY somewhere on this forum. piped tubing from maf all the way down by left fog light. no issues for a year now.

im really surprised you arent getting a light for maf. thats so odd. now if you dont have maf on, them how does your system run efficiently without knowing how much air is entering? I know that when maf is disabled, the dme runs off preset mappings, but that should severely impact mpgs and performance. the dme can no longer make adjustments to the car seeing as it is like being blind.

now Im also suspecting now that maybe its related to your o2s error. I always thought the pre cat o2s measure how well the engine is burning up its mixture, informing the dme so that it could make adjustments. if the o2s are working but try and report that the car isnt being efficient, all its doing is reporting to deaf ears.

when my maf started acting up, it didn't throw a maf code either. it told me my o2s were shot, but at that time I was having other issues as well butt yeah, I never got maf errors
I'll put my new plugs in tomorrow and replace the MAF to see what happens. I haven't noticed any change in performance or mileage with the MAF on or off. Except a super rough idle at start with the maf on
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Old 06-16-2013, 01:22 AM   #27
NumbaOneNewb
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aside from the rough idle, see if that o2 error shows its ugly face. if not blame the maf. then with a new maf, perhaps you can see the benefits of the maf
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Old 06-16-2013, 01:27 AM   #28
diM3tri
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Originally Posted by NumbaOneNewb View Post
aside from the rough idle, see if that o2 error shows its ugly face. if not blame the maf. then with a new maf, perhaps you can see the benefits of the maf
Maybe my MAF was just bad
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Old 06-16-2013, 05:52 AM   #29
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You need to actually post the DTC/CEL codes you are reading along with any Freeze Frame data if the tool you are using supports Freeze Frame data, not some general mention of a sensor mentioned in the DTC. Just because a sensor is mentioned in the DTC does not mean the sensor is bad or faulty. More often than not the sensors are not actually the problem, buy even seasoned mechanics knee jerk and jump on a sensor replacement party.

As for your mileage issue and cold start issue, the very first thing you should do is confirm your engine coolant temperature is correct. You cannot do this with the dash temp gauge, you need use the Hidden OBC Menu and/or a scan tool that reads real time data.

As for scan tools and software, read this - http://forum.e46fanatics.com/showthread.php?t=967204

Also suggest you read the 1st & 3rd links below in my signature.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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