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Old 01-01-2015, 11:29 PM   #1
Mattromiza9
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Unhappy Multiple issues all at once? 2001 330ci

Hey everyone, I'm new here and in desperate need of help with my 2001 330ci 5 speed. Recently it's been throwing lean codes(both banks), but bank 1 O2 sensor is reading .10v constant while bank 2 is fluctuating like it should. It has misfire on startup on cylinders 1,2,3(bank1). And now is having fuel cut off misfire on all cylinders.
What's been happening:

First in the mornings on a cold start it would skip and whatnot but when it warmed a bit it would run awesome. Now it skips and throws misfire codes with fuel cut off and won't respond to throttle then all of the sudden it will. (Confusing me)

Weird part:
Last night and this morning it did this and I thought the fuel pump was letting go(tested before and had 50 psi running and when you get on it, it dropped to 45) haven't tested since then which was 3 weeks ago. But anyways it was misfiring all over the place so I cleared the codes while I was driving and it went right away no skips or anything. Today it's back to weird throttle response and misfires on cold starts. I've replaced disa valve(flap was loose and was rattling) and ccv valve and hoses for cold weather climate. Also did plugs(ngk iriduims). I've checked MAF sensor and at idle reads .06. I'm kinda stumped now. I know I have a vacuum leak out of the new disa valve from taking in and out so many times trying to find out what's up with lean codes. So I have a new one coming but I'm certain that won't fix it since it didn't before.

Any help at all will help me
(Fuel filter was changed 10k ago along with valve cover gasket and oil filter housing gasket) fuel pump was unsure from previous owner.

The weather has dropped a ton and problem has gotten worse with colder temp on cold starts.

My thoughts are maybe bad bank1 O2 sensor? Or bad fuel pump? It gets better as it warms up except when fuel cut off misfires start then I have to clear code. Is someone knows what the cut off is that may help me :/

Thanks in advance everyone who can help
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Old 01-01-2015, 11:57 PM   #2
Mattromiza9
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Also upper and lower intake boots are new
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Old 01-02-2015, 12:14 AM   #3
rhombus
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Well, given that your bank 1 O2 sensor isn't doing ****, I would replace that first.
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Old 01-02-2015, 12:21 AM   #4
Mattromiza9
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It does read. Give it throttle and voltage will go up. It's not like it's flatlined but it's almost like it's slow or lazy. I'm frustrated throwing money at it honestly. Someone said could be vanos seals and cam sensor. The lean reading from bank1 maybe correct I guess? It's honestly stumping me to a whole nother level I work on cars for a career and never have I had such trouble.
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Old 01-02-2015, 09:25 AM   #5
markusmarkus
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The pre-cat O2 sensors need to be replaced at 100k miles. Their replacement is considered to be maintenance.

Is the fuel pump original? If it is, I recommend you replace the:
- fuel pump (VDO/Siemens)
- fuel filter (Mahle)
- fuel filter rubber hoses (buy a section of fuel hose from the dealer)
- 6 hose clamps for the fuel Jose.

Don't buy cheapo fuel hose as it won't last like the stuff from the dealer.

Have the codes read and report back.
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Old 01-02-2015, 09:45 AM   #6
lszlszx
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Post freeze frame for the codes.
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"Would the codes indicate if it's the carburator?"
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Old 01-02-2015, 09:57 AM   #7
jfoj
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The O2 sensor is likely properly reporting if the Voltage is 0.10 Volt.

While your car is likely 14-15 years old and probably should have the O2 sensors replaced, what you and everyone else needs to understand is lazy/bad O2 sensors will not read extreme Voltage swings.

0.10 Volt is a LEAN exhaust condition and the sensor is likely properly reporting the Lean condition.

Spend your time and money on the simple things, cracked and rotten rubber or plastic parts and replace the entire CCV and hoses.

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

You need to search YouTube for Scotty Smoke Test. Do what Scotty does or make a tester from related video.

Also read my "BMW 20 Questions" comments in this thread - http://forum.e46fanatics.com/showthread.php?t=1059972

Again, O2 sensor refresh might be a wise idea, but it will not solve your current problems.
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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, 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 01-02-2015, 10:24 AM   #8
Archbid
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Quote:
Originally Posted by markusmarkus View Post
- fuel filter rubber hoses (buy a section of fuel hose from the dealer)
- 6 hose clamps for the fuel hose
Are there part numbers for the hose or clamps? Alternatively, what length/size?
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Old 01-02-2015, 10:34 AM   #9
jfoj
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I think you need 7 hose clamps as you will need one for the connection at the fuel pump.

Standard small worm drive hose clamps are fine otherwise you will end up with the OE pinch style clamps from the dealer.

Most auto parts stores now carry the higher quality, high pressure fuel line as well.
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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, 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 01-02-2015, 05:03 PM   #10
Mattromiza9
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As I've said before I've replaced the ccv and hoses (cold weather update) and still no good it actually has gotten worse. I replaced O2 sensor today and it drives better although my wife and is now reading lean throughout whole engine instead of just bank 1 now. Fuel pressure is 50psi spot on. I've ordered intake gaskets and new disa valve. I will also be replacing all vacuum lines I can't reach under intake as well as re checking the ccv I recently installed. I will then smoke test the pig again and report back. I'm certain now that it's an intake leak somewhere that is getting worse with cold(rubber and plastic shrink with lower temps) hence why it almost clears up when it's warm. (Still bogs on random accelerations and sometimes the idle will jump up and down)

How does that sound as a conclusion?
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Old 01-02-2015, 05:19 PM   #11
jfoj
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Smoke test should have been #1 thing to do.

You would not understand HOW MANY people rule out something because it was just replaced and the problem turned out to be a problem with something they just replaced or an area where they just were working and ruled it out just because.

O2 sensors will not solve the problem, but at least they are fresh assuming they are connected properly!

Also keep in mind there are some bad CCV valves in the field. Problems with manufacturing.

http://blog.bavauto.com/15170/bmw-m5...s-ccv-cvv-pcv/

Good luck.
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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, 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 01-02-2015, 05:51 PM   #12
Mattromiza9
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The first thing I did was look at O2 values. I then smoked the intake and found a clamp bad and fixed it. But I had to take out the disa and that might of shitted up te o ring there. I'm certain now I have a major intake leak and a few,still original, hoses that need to be replaced that I cannot reach without taking intake manifold off. So hopefully new disa, new intake gaskets, new ccv, new hoses will fix it all(fuel pressure was in spec while bogging was happening so I ruled out pump and filter for now. I will also run an injector cleaner just because I have a bottle laying around. Will be worked on in the next few weeks and will report what I find. Pray it works ***9786;***65039;
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Old 01-02-2015, 06:02 PM   #13
jfoj
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No need to pull the intake and the intake gaskets are rarely an issue.

Injector cleaner not needed, will not really help unless you pull injectors and ship out for ultrasonic cleaning and flow testing.

You may have ended up with a bad tank a fuel as well?

How much fuel is in the tank now?
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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, 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 01-03-2015, 07:49 AM   #14
Mattromiza9
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I doubt it's the fuel. There's a little under half a tank. I have a fuel injector cleaner ive had for a while hence why I'm using it. Also I doubt the intake gaskets are shot but in order to get EVERY vacuum line the easiest way possible a inspect everything under the intake for any possible leak I am taking the intake off and replacing the gaskets as precaution. The line coming from the air pump is sketchy but I can't follow it all the way due to the intake being in . And I don't want to pull it off and not be able to put it back on. I will get some dry gas if you think that will help.
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Old 01-03-2015, 08:53 AM   #15
jfoj
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Need to remove the cabin air filter housing to get at the engine easier.

You will need a mirror and a good LED flashlight. The problem is everything under the intake is black and it is hard to see the 3 ports on the rear. Many people are able to deal with the connections under the intake with it still on the car, it is not easy, but is possible.

Smoke will help you find the leaks, but you also need to make sure the crankcase fills up with smoke to find the valve cover leaks. Usually removing the oil fill cap and waiting for a good amount of smoke to pour out of the crankcase or inject smoke directly into the oil fill hole.
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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, 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 01-03-2015, 10:01 AM   #16
Mattromiza9
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Valve cover, oil filter housing gasket and oil pan gasket are new. Only thing is you said some ccv valves are bad from factory. So me taking the intake off completely will allow me to make sure all connections are good and it's working rather than me try and see in a tight space. I understand it can be done but why not just take it off and be 100% sure everything is correct rather than say I think it is...ya know?
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Old 01-03-2015, 10:11 AM   #17
jfoj
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Bad CCV's have internal issues, you cannot determine what is going on by an external visual inspection.

Have fun.
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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, 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 01-03-2015, 10:35 AM   #18
Mattromiza9
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Apply a vacuum to it while it's out?
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Old 01-03-2015, 11:18 AM   #19
jfoj
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One way possibly, however, I would check the crankcase vacuum at the oil fill cap while the car is still operational. The oil fill cap should be pretty easy to remove and you should see the STFT jump up to +20% or slightly higher.
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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, 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 01-03-2015, 11:28 AM   #20
Mattromiza9
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Well if I did do that what are the prob causes if there is excessive vacuum in the crankcase? Oil dipstick tube o ring? Because all other gaskets are newish. No oil leaks. Would that be a tell tale sign of the ccv valve is junk? If oil cap is hard to remove? I've done that recently and the idle did change and it wasn't hard to remove at all. (I've seen what you mean by its sucked down) and it wasn't anything like that. So I believe the ccv is working properly. Also if the diaphragm was folded or ripped from factory wouldn't a small oil leak be coming from it? Obviously over time
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