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Old 01-28-2013, 01:56 AM   #1
BombCenter
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Erratic/High Idle, Low Power, Intermittent Stalling

Hi all, first time poster here.

Subject pretty much says it all. I own a 2002 (09/01) BMW 330i Sedan w/ Sport Pkg, stock, which of late is having some problems.

When "behaving", idle hovers between 500-520rpm, which seems and feels a bit low (kinda rough). When acting up, idle fluctuates between 500-750rpm. When being a pain in the ass, idle remains high at 750-770rpm. At high idle, the car stalls/wants to stall under acceleration from stop, doesn't matter if its low/moderate/hard acceleration, though moderate acceleration will keep the engine from dying altogether. Power is low throughout the entire rpm range, though I'm reluctant to take it past 3500k.

So, I'm trying to fix the problem, here's the possible causes I've gathered so far:
1) Bad/Dirty MAF
2) Exh O2 Sensors bad?
3) ICV/IAC (I assume these are the same thing) Bad/Stuck
4) Vacuum Leak

I'm trying to fix the problem in the order of cheapest to most expensive. So I started with cleaning the MAF. No joy. Next, I want to start replacing vacuum hoses as I'm sure at least one is cracked, but have been unable to find a complete vacuum diagram. Does somebody have one? Couple hours of Googling yielded partial diagrams.

Also, gear shifts are clonky, though I think this is an unrelated problem -- I suppose you could technically use vacuum to do some sort of matching -- but I doubt that's how ZF does it.

Any other/obvious causes I might have overlooked? I'm not much of a car guy.

Last edited by BombCenter; 01-28-2013 at 01:58 AM.
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Old 01-28-2013, 02:33 AM   #2
drbworld
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CCV. Period. Same symptoms.
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Old 01-28-2013, 06:09 AM   #3
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The lower intake boot often cracks. See jfoj's sig file for help with vac hoses. There is a vac diagram under the hood too that might help.

TB gets stuck so that can be cleaned too while cleaning the icv.

I don't know your mileage (which helps to know), but assuming it's like most cars here, there might be a number of other basic items not maintained--plugs, filters, belts, pulleys--but rather than guess, if you haven't done so yet, get your codes read and search for them here...add them to this thread. They'll help point you in some direction...hopefully the right one. Autozone reads them for free.
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Old 01-28-2013, 11:42 AM   #4
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first thing to do is always check your codes
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Old 01-28-2013, 10:41 PM   #5
BombCenter
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Quote:
Originally Posted by dmax View Post
The lower intake boot often cracks. See jfoj's sig file for help with vac hoses. There is a vac diagram under the hood too that might help.

TB gets stuck so that can be cleaned too while cleaning the icv.

I don't know your mileage (which helps to know), but assuming it's like most cars here, there might be a number of other basic items not maintained--plugs, filters, belts, pulleys--but rather than guess, if you haven't done so yet, get your codes read and search for them here...add them to this thread. They'll help point you in some direction...hopefully the right one. Autozone reads them for free.
-190096mi
-Plugs approx 26k. Bosch +4 Platinums (OEM)
-Belt (serpentine) approx 2yrs (serviced at 170k when trans hose burst on fwy)
-Air (K&N), Fuel, Trans, Cabin filters less than 1 yr/20k, Oil filter less than 5k.
-Trans fluid (Mechanic claimed Esso, didn't verify) less than 3yr/45k, Oil and Coolant less than 5k.
-Never touched a pulley

I'll stop by Kragen on the way home after work tomorrow, thx for the input.

Last edited by BombCenter; 01-28-2013 at 10:57 PM.
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Old 01-28-2013, 10:51 PM   #6
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Quote:
Originally Posted by drbworld View Post
CCV. Period. Same symptoms.
From Bimmerfest:
"The crankcase vent valve and 4 associate hoses fail and cause a vacuum leak. The valve gets stuck open and the hoses crack. These last 70-120k miles and usually fail 80-90k miles. Here are a couple diagnoses.
At warm idle, place a small plastic freezer storage bag on its side over the oil fill hole. If the bag sits on top or gets slightly sucked in, ~1", the valve is good. If the bag gets significantly sucked in the hole the valve is stuck open and bad.
With the engine off and cold, carefully remove the hose at the valve cover front corner. Blow hard into the hole. You should hear oil bubbling in the oil pan. If you don't hear the bubbling the top or bottom hose is likely cracked. The bottom hose often breaks just below the valve connection. There can also be cracks in the other two hoses."

Can also place a balloon over dipstick tube (with dipstick removed, obviously) and see if it inflates/partially inflates. Anyone got a balloon? =D

I suppose I'll start with the hoses before replacing the CCV/EGR/PCV/whatever.
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Old 01-28-2013, 11:11 PM   #7
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Quote:
Originally Posted by BombCenter View Post
From Bimmerfest:
"The crankcase vent valve and 4 associate hoses fail and cause a vacuum leak. The valve gets stuck open and the hoses crack. These last 70-120k miles and usually fail 80-90k miles. Here are a couple diagnoses.
At warm idle, place a small plastic freezer storage bag on its side over the oil fill hole. If the bag sits on top or gets slightly sucked in, ~1", the valve is good. If the bag gets significantly sucked in the hole the valve is stuck open and bad.
With the engine off and cold, carefully remove the hose at the valve cover front corner. Blow hard into the hole. You should hear oil bubbling in the oil pan. If you don't hear the bubbling the top or bottom hose is likely cracked. The bottom hose often breaks just below the valve connection. There can also be cracks in the other two hoses."

Can also place a balloon over dipstick tube (with dipstick removed, obviously) and see if it inflates/partially inflates. Anyone got a balloon? =D

I suppose I'll start with the hoses before replacing the CCV/EGR/PCV/whatever.
This test didn't do anything for me. My hoses were fine, but my valve failed a different way.
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Old 01-28-2013, 11:22 PM   #8
BombCenter
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Quote:
first thing to do is always check your codes
Will do. I should know better. Being IT, log data is invaluable; I've gotten people fired with it. Leak secrets on MY network, yea right.

On a side note, do codes always trigger CEL? With all the idle problems and no CEL sometimes I think my CEL led is broken, but it lights up on position 2 in ignition. I guess I kind of answered my own question. Last time I had codes checked all I had was trans slip, which I can't really do anything about without rebuilding the trans. Fluid and filter had less than 1000mi at that point.
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Old 01-28-2013, 11:24 PM   #9
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Originally Posted by drbworld View Post
This test didn't do anything for me. My hoses were fine, but my valve failed a different way.
Ah, OK. Good to know. I'll forego the test then.

Any recommendations on E46 OBDII Scanner? There's so many, and some read only generic, some read factory, some only partially read factory, etc. I'd be willing to spend around $100-150.

EDIT: If it'll read codes from an E90/92 and an 06 Lotus Elise SC too, that'd be great, though not a requirement.

Last edited by BombCenter; 01-28-2013 at 11:26 PM. Reason: If it'll read codes from an E90/92 and an 06 Lotus Elise SC too, that'd be great, though not a requirement.
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Old 01-28-2013, 11:51 PM   #10
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Inpa. Absolutely the best. Unless u can get gt1.
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Old 01-29-2013, 05:31 AM   #11
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autozone reads codes for free...but since you're IT, you'd probably enjoy playing with some program after you fix your issue.
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Old 01-29-2013, 05:31 AM   #12
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If you have a Droid device, Torque Pro for $5 and a $15 ELM327 OBD to Bluetooth adapter from Amazon is a good generic option.

Since you are in IT you likely have a laptop available? Another generic option for the laptop for under $30 is - http://forum.e46fanatics.com/showthread.php?t=967204

A nice generic stand alone tool that will read real time data and has some level of internal graphing is this tool, http://www.careucar.com/wholesale/la...de-reader.html

I have this and it is actually the 1st tool I always grab as it is dirt simple, reads real time data and can graph internally. Internal graphing is not the best, but it is useful at times. I do not know of another generic tool that has this option for the price.

BMW specific you likely would want either BMW Scanner 1.4.0 - http://www.xcar360.com/bmw-scanner-1...scan-tool.html

or http://www.newegg.com/Product/Produc...9SIA1PU0KJ1976 however this has shown out of stock for a while.

or since you also want E9x coverage as well, you might try this - http://www.xcar360.com/bmw-dash-scanner-3-in-1.html

Or this which also includes INPA and a 20-16 pin OBD adapter -
http://www.xcar360.com/bmw-diagnostic-interface.html

Unfortunately you really need a generic and BMW specific tool to really do everything you need to do.
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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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Old 01-29-2013, 05:42 AM   #13
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You may find a cam position sensor fault too.
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Old 01-29-2013, 10:56 AM   #14
drbworld
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I thought I would show how my ccv failed on me. the rubber seal was ripping, which caused it not to seal close on idle, which lead to unmetered air and oil from crankcase to be sucked into the intake manifold.


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Old 01-29-2013, 12:01 PM   #15
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drbworld,

Thanks for posting the picture of the CCV failure.

What were your symptoms?

Did you ever look at fuel trims as well when this was bad?
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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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Old 01-30-2013, 11:02 PM   #16
BombCenter
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That $25 software looks interesting. I have a couple laptops and a tablet that acts as a terminal for the PowerEdge 2U rackmount in my tech cave (aka closet). Scanner 1.4 seems like a good option too, I might be able to jury rig a Bluetooth transceiver on a USB A-B genderchanger and make it wireless, I dunno if OBD supplies power or not. If the tool doesn't read E9x, whatever, my bro can buy his own tools. Thanks for the recommendations.

I know I promised codes, and I intend on getting them, but I've had to work late the last 2 nights as we have a 12k sqft cleanroom (class 1000) undergoing startup with turnover to NASA scheduled for end of next week. And I'm in charge of all the networking (CAT6 & 50um MM OM3 16 Fiber LC-LC Duplex, and speccing/quoting transceivers and switches for connection to their existing network). I'll try again for codes tomorrow.

Thanks all for the feedback, been very helpful. I'll check into the camshaft position sensor also.

Last edited by BombCenter; 01-30-2013 at 11:06 PM.
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Old 02-02-2013, 04:43 AM   #17
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does anyone have a DIY on a CCV/PCV removal and install?

THanks
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