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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 07-31-2014, 09:15 PM   #1
pilotcorky
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My Ride: '01 330i
Unhappy 330i misfire issues.. Help a noob out!

Hi guys, I just brought home a 2001 BMW 330i Sedan, and then engine isn't too happy at the moment. Cruises ok, but idles rough and stalls after taking it out of gear and lifting off the throttle from high rpms. Also doesn't want to rev past 4k, but I didn't try it much since I don't want to do any more damage.

Bunch of codes:
P0300 (Random Misfire)
P1349, P1351, P1353 (Misfire Cylinders 4,5,6 with Fuel Cut-off)
P0171 (System Too Lean, Bank 1)
P0174 (System too Lean, Bank 2).

There's also a P1191 (Pre catalyst fuel trim system bank 2) pending.

After doing some research I think it could be bad coils, intake boot, idle control valve, or a valve cover gasket. Valve cover vent hose looks like it was broken at one point as it's been epoxied back together by the previous owner...

Any advice would be appreciated, really want to get this thing going!!!!
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Old 07-31-2014, 09:33 PM   #2
jfoj
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Forget the coils and plugs for the moment. Although the car could probably use spark plugs, pass on them for now, you have other issues to address.

You need to read the first 2 links below in my signature.

You will need intake boots, the DISA is likely in bad shape, the CCV system and hoses need to be replaced and the the fuel filter needs to be replaced.

Might needs some O2 sensors, but wait on these.

DO NOT consider changing the MAF at this point.

Nothing too much to worry about, all basic maintenance and hopefully you are a DIY person as it is not cheap to pay someone for these repairs.

Also you NEED your own OBDII smart phone App and interface, $35 or less, it will save you hundreds and many headaches.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 07-31-2014, 09:41 PM   #3
pilotcorky
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Looks like I have some homework to do!

Would it be worth pulling a coil out and seeing if it's oil soaked to rule out the valve cover gasket?
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Old 08-01-2014, 02:13 AM   #4
jfoj
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Quote:
Originally Posted by pilotcorky View Post
Looks like I have some homework to do!

Would it be worth pulling a coil out and seeing if it's oil soaked to rule out the valve cover gasket?
Nope, Lean codes mean you have intake/crankcase air leaks, these will cause misfires. If you just purchased the car, order both intake boots, cut the old upper boot to get the F connector out, check the CCV lower oil return line to the dipstick tube, suggest just ordering this replacement hose as it will need to be replaced.

The entire CCV will need to be replaced, but the lower oil return hose will buy you time and is the most likely problem if the other hoses are still in tact.

If you do not know where the leaks are, search YouTube Scotty Smoke Test and have fun.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 08-01-2014, 01:21 PM   #5
pilotcorky
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So I started pulling the intake apart and when I removed the DISA it was clear that the intake has a bunch of oil in it. I take it that means CCV?
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Old 08-01-2014, 02:10 PM   #6
jfoj
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I hope you did not pull the intake, not really needed.

The intake will have some sandy looking oily mess in the DISA opening, this is pretty normal.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 08-01-2014, 04:14 PM   #7
pilotcorky
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Nope haha just the air box and the DISA. I cleared the fault codes and since then it's been running just about normally, idle bounces around sometimes but that's about it.. We'll see if it stays that way.. Still throwing the system too lean codes, so I guess it needs a fuel filter! Thanks for your helps jfoj, really appreciate it!
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Old 08-01-2014, 07:00 PM   #8
markusmarkus
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Quote:
Originally Posted by pilotcorky View Post
Nope haha just the air box and the DISA. I cleared the fault codes and since then it's been running just about normally, idle bounces around sometimes but that's about it.. We'll see if it stays that way.. Still throwing the system too lean codes, so I guess it needs a fuel filter! Thanks for your helps jfoj, really appreciate it!


You still have vacuum leaks. Listen to jfoj - he knows what he's talking g about. Fix the vacuum leaks FIRST!



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Old 08-01-2014, 07:05 PM   #9
pilotcorky
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Understood. Really appreciate all the advice, gonna take me a while to get up to speed with this thing...
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Old 08-01-2014, 07:20 PM   #10
jfoj
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Search YouTube Scotty Smoke Test, this will give you another tool in your arsenal.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 08-04-2014, 10:00 AM   #11
GeorgeCz
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Quote:
Originally Posted by jfoj View Post
Forget the coils and plugs for the moment. Although the car could probably use spark plugs, pass on them for now, you have other issues to address.

You need to read the first 2 links below in my signature.

You will need intake boots, the DISA is likely in bad shape, the CCV system and hoses need to be replaced and the the fuel filter needs to be replaced.

Might needs some O2 sensors, but wait on these.

DO NOT consider changing the MAF at this point.

Nothing too much to worry about, all basic maintenance and hopefully you are a DIY person as it is not cheap to pay someone for these repairs.

Also you NEED your own OBDII smart phone App and interface, $35 or less, it will save you hundreds and many headaches.
Hello -

do you recommend any particular "OBDII smart phone App and interface" - jfoj? I've been looking but don't see any for $35 or less -
also been reading your "Solve your misfires, lean codes, rough idle - link

I'm a NOOB so trying to DIY..

Thank you
George
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Old 08-04-2014, 10:10 AM   #12
pilotcorky
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Quote:
Originally Posted by GeorgeCz View Post
Hello -

do you recommend any particular "OBDII smart phone App and interface" - jfoj? I've been looking but don't see any for $35 or less -
also been reading your "Solve your misfires, lean codes, rough idle - link

I'm a NOOB so trying to DIY..

Thank you
George
If you have an Android phone look at "Torque", $5 app and it does pretty much everything. Any bluetooth OBDII scanner should work, if you want a cheap one just search for "elm327" on eBay or something.


Also, got a shop to do diagnostics for me... Crankcase ventilation system's dead, and the DISA gasket's leaking. Spot on, jfoj!
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Old 08-04-2014, 11:23 AM   #13
GeorgeCz
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thank you pilotcorky -- & jfoji -- I would have never know such an app is available for smartphones --

Now to be clear I download the Torque Lite App (free) on my Galaxy S4.. (to try) later get the pro version. Purchase an inexpensive Elm327 device on eBay and my phone connects up via bluetooth so I can read codes and reset codes?

I see a Mini ELM327 OBD2 OBDII Bluetooth Auto Diagnostic Scanner With Switch For Android does anyone know if this device works with Torque Lite App?

Regards
George

Last edited by GeorgeCz; 08-04-2014 at 03:23 PM. Reason: additional Q
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Old 08-04-2014, 10:07 PM   #14
pilotcorky
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Should be fine!
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Old 08-08-2014, 03:07 PM   #15
pilotcorky
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Well, I replaced the crankcase vent valve and all its hoses, then did the DISA valve, and it's still misfiring at idle and throwing codes... Turns out the valve cover itself is cracked where it connects to the vent hose. This just got loads more expensive
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Old 08-08-2014, 03:46 PM   #16
monsterhobby
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Hi Folks, Help needed here my 2000 E46 wagon is driving me wild, it started knocking and with rough idle so I read up and changed my ccv and the 4 hoses, cleaned my Disa and changed the O ring, Cleaned the ICV and replaced the throttle body gasket, intake boots, plugs, all 6 coils, Cam sensor, vacume lines, fuel filter, and still I get codes P0170, P0173 after i clear the codes when i start up they come back Idleing has gotten better and the knocking is gone but now I have tons of missfires when first moved, ocasionally it will work ok for a couple miles and when i stop and try to continue it will lose all power sounds like it's fuel starved, sometimes i have to pull over turn it off and restart some time it will rev up sometimes it won't any and all help will be greatly apreciated, thanks in advance God Bless you all...
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Old 08-08-2014, 04:05 PM   #17
jfoj
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Need to determine if the problem is fuel related or a vacuum leak.

Could be a bad load of fuel or a fuel pump. See 2nd link in my signature.

If you have OBDII Freeze Frame data and codes post the info.

Post warm idle Fuel Trim info as well.

Search YouTube Scotty Smoke Test for ideas on how to located vacuum leaks.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 08-19-2014, 09:01 PM   #18
pilotcorky
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The saga continues.... I replaced my valve cover (had a piece of the vent hose nipple snapped off), and it made everything a million times worse. Car barely idles at all and stalls out sometimes. Drives fine once it's moving.

So assuming I didn't drop anything in the engine and that I seated the new cover correctly.... Any ideas? I'm about ready to call it quits and take the car and what's left of my wallet to a pro :/

EDIT: Current codes are misfires with fuel cut off on all 6 cylinders, plus system too lean on both banks. Fuel trims are all over the place but the long term is around 25%, which is high I guess? Certainly acting like a vacuum leak still..

Last edited by pilotcorky; 08-19-2014 at 09:05 PM.
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Old 08-19-2014, 09:11 PM   #19
jfoj
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Search YouTube Scotty Smoke Test.

If the engine is running that bad, you should be able to EASILY find the vacuum leaks, yes likely more than one.

Also brake booster failures cannot be found with smoke due to the check valve on the booster.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 08-19-2014, 09:29 PM   #20
pilotcorky
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Roger that. Hopefully I just pulled a hose off or something...
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