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General E46 Forum
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Old 11-29-2011, 02:39 PM   #1
MooflesThaCat
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Idle Control Valve Malfunction && System too Lean problems

Hello all,

I've been going through this neverending saga with my E46. It all started when my father acidentally yanked out the hose connecting my EVAP to the Intake Manifold. After a long disassembly and help from some members here I was able to take apart the manifold and reconnect it. Now I'm getting other codes and I could really use some help. First I got

Intake Control Valve Malfunction
System Too Lean (Bank 1)
System Too Lean (Bank 2)

I doubt the Intake Control Valve went bad right after changing the EVAP, so I removed it and cleaned it. I put everything back together, but now I have a wierd problem where if i rev the engine in Park to around 4-5000 RPM, when it drops down, it will drop to 1000 RPM and bounce between 1000 RPM to 1500 RPM, and It'l do this every second for about a minute or two. Then it will settle back to its normal rev. Also, now I have the following errors.

Intake Control Valve Malfuntion
MAF or VAF Circuit low
System Too Lean (Bank 1)
System Too Lean (Bank 2)

Also important to know, My lower boot, as well as all hosing leading to the MAF is NEW, as is the MAF. I also changed the Intake Manifold Gasket and the Valve Cover Gasket. Please help me before I drive this car off a cliff

Thanks!
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Old 11-29-2011, 03:31 PM   #2
Jmarlowe330i
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Have you checked your disa valve, it'll throw codes like that for both banks is the seal has went bad. If you have had it out and back in then this could also be your problem. If its in good condition, and you dont feel like spending an arm and a leg then RTV gasket maker all around the crappy seal and shove it back in there and let it sit over night. I hope this helps
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Old 11-29-2011, 04:20 PM   #3
MooflesThaCat
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I definitely will do that, but what do I do about the idle revving problem? When I get home I'll post a video so you know what I'm talking about.
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Old 11-29-2011, 04:52 PM   #4
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That is probably coming from the vaccum leak which is causing it to jump RPM. The pic is a picture of a brand new DISA valve. This is what the seal looks like new. A bad DISA valve seal will be flat and flush with both black edges. Another good way to know if the DISA valve seal is any good is, once you got it out if it slides right back in and out with basically no effort then its probably shot. When I put my new one in it was a fight to get it all the way, thanks to the new seal. Yours shouldnt be that hard going back in if its good but it should take a little effort and not just slide in and out.......pun intended ha
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Old 11-29-2011, 04:54 PM   #5
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****ing hate BMW seals.
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Old 11-29-2011, 04:58 PM   #6
MooflesThaCat
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Yea it's definitely shot because it's lose as ****. But what worries me is that the whole revving problem didn't happen until right after I cleaned my icv. Is it just the disa u think, or do I have to take out the icv again? Thanks a lot for your help btw!!
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Old 11-29-2011, 04:59 PM   #7
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hmm what did you use on your ICV when you cleaned it
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Old 11-29-2011, 05:01 PM   #8
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This may sound funny but make sure the ICV is completely plugged back in. Happens more often than you'd think. Go ahead and fix the DISA seal as well, if it's not bad it will be soon.
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Old 11-29-2011, 05:02 PM   #9
MooflesThaCat
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Throttle body cleaner
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Old 11-29-2011, 05:04 PM   #10
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im having the same problem just when i rev it the rpm will be bouncing also if i stay idling at a light n dont add gas it will start misfiring. ill check my disa valve
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Old 11-29-2011, 05:11 PM   #11
Jmarlowe330i
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I thought so. Ok throttle body cleaner is great for getting the carbon out but it also is so good that it can over clean and make the valve sticky. What I would run through it is seafaom deep creep. Its a cleaner as well as a lubricant so it will keep the ICV working smoothly. While you got it back out make sure the blue thing (cant think of what to call it and I've never seen anybody say its gone bad and hardened up) that it goes into is rubber like and not hard or anything. When you put it back make sure its all the way in there and your ICV should be good to go.
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Old 11-29-2011, 05:14 PM   #12
MooflesThaCat
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I dd spray it with lubricant but ill pick up some of that just in case. Do they sell it at autoZone or pep boys or is it an online only product?
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Old 11-29-2011, 05:18 PM   #13
Jmarlowe330i
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yea autozone for sure thats were i got mine
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Old 12-17-2011, 07:05 PM   #14
MooflesThaCat
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OK this damn car is still shooting out codes. I cleaned the ICV again with Deep Creep and it ran for two cycles with no codes. Then on the third cycle it spit out

Idle Control Valve Malfunction
System too Lean (Bank 2)
Misfires in Cylinders 4-6

This car is really driving me crazy. I'd change the ICV but I'm not entirely sure it's really the problem.
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Old 12-18-2011, 12:03 PM   #15
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anybody?
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Old 12-18-2011, 12:28 PM   #16
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It's good that you have the problem isolated in one bank. That sort of rules out the MAF and lower boot, but I don't think it rules out DISA or a leak from close to those cylinders. There's an intake air temp sensor that I believe is around there...might be closer to the front though.

If you had manifold off to fix things...I hate to suggest that might be an issue. Have you tried spraying a carb cleaner around to see if you get the engine to notice? That's one way of finding leaks...which it may indeed be.

I'm not sure what EVAP you were hooking into the manifold? The vac line from the SAP or do you mean part of the evap system?

Forgot to mention this too...if you were playing with the sap hose leaving the valve, then I wonder if maybe one of the 02 sensor connections might have been affected. I'd think the car would know this, but maybe a wire got kinked a bit and it lost some strands and thus its signal is off? I'm mostly making this up...doubt it's that, but keep an open mind. Odd things happen to cars all the time, but I like proximate causes the best. Did you remove icv to clean with deep creep?
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Old 12-19-2011, 12:33 PM   #17
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i have been having this exact same issue. i also have a new maf and replaced some coils. i cleaned my ICV as well, and the reving started after that. my initial problem was my DISA valve was broken. I have fixed it but do need a new seal on the DISA, maybe it is the disa after all. thought maybe my issue n troubleshooting might help you out
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