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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 09-29-2019, 12:22 PM
super_landrum super_landrum is offline
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Misfires and system running lean

Hello, I am new to this forum but it looks like a great community for BMW owners and I just got my first one.

So my 2002 BMW 325i is having some issues even after I just spent $1,500 getting it fixed up. I got 6 new spark plugs, 2 new ignition coils, a new fuel injector, a new camshaft position sensor, a leaking valve cover gasket and a new fuel rail installed.

It is still having the issue that was the most pertinent to begin with, which is the engine cutting right back off when I start it up. I have to rev it up for about a minute before it will get running, and then it has a rough idle after it gets running. It seems to do alright once it gets going, however. It drives well on the highway.

The error codes I'm getting on it are many..

P0300 - random misfire detected
P1085 - Fuel Control Mixture Lean Bank 2 Sensor 1
P0444 - Evaporative Emission Control System Purge Control Valve Open
P1351 - Misfire Cylinder 1 with fuel cutoff
P1349 - Misfire Cylinder 4 with fuel cutoff
P0174 - System Too Lean Bank 2
P0171 - System Too Lean Bank 1
P0313 - Misfire Detected With Low Fuel

I was told by the mechanic that worked on it that the engine had a lot of carbon buildup and that it would hopefully clear out overtime.. However, I'm scared to keep driving it with all these codes on it. Does anyone have any idea what might be the issue? It seems to me that there might be a leak on one of the vacuum hoses or the CCV valve, but the mechanic seemed pretty confident that those had been replaced recently enough that it shouldn't be that.

Any help would be greatly appreciated.
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  #2  
Old 09-29-2019, 02:05 PM
Bimmer96abed Bimmer96abed is offline
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Pm me or whatsapp at 0096170060495 or Skype Khalid.b.a I will follow up with you

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  #3  
Old 09-30-2019, 06:47 AM
marcozandrini marcozandrini is offline
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The first step is to get rid of all of the vacuum leaks. The intake needs to be professionally smoke tested. At that age a lot of the rubber hoses are going bad.
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Old 09-30-2019, 08:42 AM
McLarenBMW McLarenBMW is offline
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I had misfires with fuel cutoff on cylinders 4/5, the fuel pump was the issue. Replaced it myself in an hour and car runs strong now
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Old 09-30-2019, 07:45 PM
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SchwarzeEwigkt SchwarzeEwigkt is offline
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Quote:
Originally Posted by marcozandrini View Post
The first step is to get rid of all of the vacuum leaks. The intake needs to be professionally smoke tested. At that age a lot of the rubber hoses are going bad.


+1. It sounds like you’ve got multiple problems, but there’s almost definitely one or more vacuum leaks here. If fixing those doesn’t clear it up, you should start looking at testing the fuel pump and putting a new filter in.


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Old 10-01-2019, 11:51 PM
super_landrum super_landrum is offline
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Thanks a lot for the help guys.. Guess I'm gonna have to call around and see how cheap I can get a smoke test done. We shall see if anyone will do it for less than 100. It's gonna cost me a ton of money to replace all the vacuum hoses but hopefully it will be worth it. @McLarenBMW, I actually did put a new fuel pump in and it seemed to help a little at first but its still having all the misfires. Do you guys know if its safe to drive it with the system running lean like mine is? I kinda need to drive it to work before I can put more money into it.
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Old 10-01-2019, 11:55 PM
McLarenBMW McLarenBMW is offline
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Quote:
Originally Posted by super_landrum View Post
Thanks a lot for the help guys.. Guess I'm gonna have to call around and see how cheap I can get a smoke test done. We shall see if anyone will do it for less than 100. It's gonna cost me a ton of money to replace all the vacuum hoses but hopefully it will be worth it. @McLarenBMW, I actually did put a new fuel pump in and it seemed to help a little at first but its still having all the misfires. Do you guys know if its safe to drive it with the system running lean like mine is? I kinda need to drive it to work before I can put more money into it.
I have the lean crap too after replacing my pump and my car runs fine, as fine as a 180k mile Bimmer can run lol. It would take a serious vacuum leak to affect the car in any way I imagine, watch the 50sKid on YouTube to diagnose vacuum leaks

Last edited by McLarenBMW; 10-01-2019 at 11:57 PM.
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Old 10-03-2019, 04:49 PM
Dahammer Dahammer is offline
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I'd try to limit the amount I drove it as much as possible until it is fixed. I'd do some diagnostics like checking the fuel trims, O2 sensor readings, smoke testing, check the fuel pressure and etc to help determine what it is actually doing. Then go from there. You can build a homemade smoke machine pretty cheap, if you want to go at yourself. You can also buy OBDII software, like OBDFusion, and a wireless interface for cheap. If you'd rather take it to someone, try to find a specialist that is experienced with E46s. Lean conditions is one of the most common issues, if not the most common, on them.

Last edited by Dahammer; 10-03-2019 at 04:50 PM.
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Old 10-03-2019, 04:55 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Worth a try?


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