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Old 02-25-2013, 04:33 AM   #1
pSyCoSiS
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2003 BMW E46 325i Sport - IDLING ISSUE - Please Help !!!

Hi there,

We have a 2003 BMW E46 325i Sport Saloon.

It has an issue whereby the revs fluctuate - it revs up and down, especially when coming to a stop.

So far, we have completed the following work to it:

Full Inspection 2 Service (incl Spark Plugs, fuel filter, etc)
The software has been updated
Cleaned Vanos Solenoid
Fitted a new Idle Control Valve (OEM Bosch unit)
Fitted new CCV with all the main hoses (Original BMW Parts)
Removed MAF Sensor - and it still runs the same
There are NO fault codes showing on the diagnostics

The issue is still there. The car revs up and down when idling, and it stalls when you try and pull away. It does this whilst in traffic or when coming to a stop.

It's my wife's car, so unsafe to drive as it is (it stalled on her once when trying to pull away on a roundabout, and another car nearly went into her). I'm just getting fed up now, as we have thrown alot of money at it and it isn't resolving the issue.

Some people have mentioned the Vanos seals... Could this be an issue causing this? If so, what sort of money are you looking to have it all sorted?

Anything else we can check?

Many thanks for your help - I really hope we can get to the bottom of this!
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Old 02-25-2013, 07:12 AM   #2
Adionik
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Vac leak somewhere
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Old 02-25-2013, 07:56 AM   #3
pSyCoSiS
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It has been checked several times over for vac leaks, and nothings seems to be there.

All the pipes are in good order, and the CCV items have been replaced.

It's driving us mad now!
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Old 02-25-2013, 08:30 AM   #4
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Intake manifold gasket?
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Old 02-25-2013, 08:38 AM   #5
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Thanks for that.

I have asked the BMW specialist to check that. But, I'm pretty sure he did check all of these when he had the manifold off to do the CCV.

All the common issues have been checked / replaced, so at a loss to what the issue is now!
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Old 02-25-2013, 08:44 AM   #6
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I'd consider taking it to another dealer or specialist then. You've changed out the majority of the parts i'd consider to be troublesome for idle. It could possibly be something in the TPS as well
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Old 02-25-2013, 09:45 AM   #7
pSyCoSiS
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Do you think it could be something major, other than the parts already replaced (which haven't been cheap!).
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Old 02-25-2013, 10:19 AM   #8
Adionik
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How is he reading the codes? See if there are any hidden BMW codes.

Maybe take a look at your coils and definitely get a compression test at this point
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Old 02-25-2013, 10:34 AM   #9
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Quote:
Originally Posted by mrlatexxx View Post

And also op do solidjake test on adjuster unit aka http://www.realoem.com/bmw/showparts...03&hg=11&fg=45

#7. Check the rubber around it, it gets old and permits air in causing misfire.

Also check # 4. And clean #1> http://www.realoem.com/bmw/showparts...03&hg=11&fg=45



sent from phone to bimmer app
Check those:
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Old 02-25-2013, 02:15 PM   #10
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I've done almost everything you have. Compression was over 210 on all cylinders and the leak down test gave good results. Don't know what to do at this point. You're not the only one. :-)
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Old 03-05-2013, 04:24 AM   #11
pSyCoSiS
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Right - an update on the issue....

I have had the car taken to a 2nd Independent BMW Specialist.

They performed a diagnostic check using Auto Logic Diagnostic equipment - NO ERROR CODES showing.

He also perfomed a 'smoke test' twice, to check for any air leaks. Still no joy, and no leaks have been found.

Even he was stumped as to what the issue could be.

The only thing it is pointing to now is the VANOS seals, according to the online forums and the symptoms described. To me, it does seem a litte down on low end power and torque, and does seem to stall more when cold.

PLEASE HELP !!!

It's getting too expensive now, throwing money at it and hoping it will solve the issue. Really don't want to pay for the VANOS seals ony to find it doesnt resolve the issue!

Any further guidance would be appreciated.
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Old 03-05-2013, 04:30 AM   #12
pSyCoSiS
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Originally Posted by mrlatexxx View Post
Check those:
Thanks for the input - much appreciated.

These have all been checked and appear to all be in good health!

not sure what to do next...
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Old 03-05-2013, 04:41 AM   #13
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Vac leak somewhere
+1

99.99% sure, that there is air leak somewhere which has not been discovered yet. Did you check that hose, which leaves from MAF? Leak which size is small as pinhole, is enough big to mess up the idle.
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Old 03-05-2013, 04:50 AM   #14
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So if you came in here 'cold,' I'd say icv.

I know you got a new one, so one question is it OE...same ? for other components.

But, if it was smoke tested and someone didn't replace the lower intake boot, it's possible that the mechanic missed a tear.

It's also possible that something as simple as the icv connector not being on right.

You can get to it by removing just the airbox...it's a round cap connector and it gives many an issue.

If you haven't tried a diy smoke test with carb cleaner, that might reveal something too. Sure sounds like icv or an air leak to me.

Also, if you really have no codes, that itself eliminates many issues, so don't forget that. Might be worth it for you to get codes read elsewhere, just in case some popped up.

...and a bump for you!
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Old 03-05-2013, 05:34 AM   #15
pSyCoSiS
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Thanks for the prompt responses.

It makes sense that is it air leak-related, but we just can't see an air leak anywhere!

brake cleaner has been sprayed, and nothing found. Also, two smoke tests did not reveal anything.

I'll see if these two things can be double checked.

Any chance it is vanos related?
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Old 03-05-2013, 05:47 AM   #16
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Did they check the fuel trims when diagnosing? If trims are railed (-+ 24) it is likely your MAF. If trims are high (8-15) then air leak. MAF should set code, but you never know. Besides, this is helpful info for diagnosing. Moderately high trims can also be fuel pump.

If your trims are near zero you can look elsewhere. Not a vac leak. (Not big enough to cause your symptoms)

Good luck
Jim

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Old 03-05-2013, 11:13 AM   #17
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When you pull your MAF off (power switch tab thing, not the actual MAF), is there any difference in idle when the car is running?
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Old 03-05-2013, 11:16 AM   #18
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DISA box.

I don't see you have checked on this part.

Last edited by icecolde46; 03-05-2013 at 11:16 AM.
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Old 03-06-2013, 05:59 AM   #19
pSyCoSiS
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Quote:
Originally Posted by HallisterJ1 View Post
When you pull your MAF off (power switch tab thing, not the actual MAF), is there any difference in idle when the car is running?
Thanks for the reply. I believe this has been checked already, but will double-check.
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Old 03-06-2013, 06:04 AM   #20
pSyCoSiS
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Quote:
Originally Posted by icecolde46 View Post
DISA box.

I don't see you have checked on this part.
Is this the DISA Valve / Adjustor Unit?

If so, it has been removed, checked for any play and thoroughly cleaned before putting back.

Is this what you mean, or is it something that has been missed out?
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