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Old 11-19-2012, 05:52 PM   #1
always-there
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7 diagnostic codes

So I replaced my maf sensor, and now that I had it hooked up to the code reader I get 7 codes. It turns out the car has multiple misfires and a large vacuum leak. What does this tell me? Something I already planned on replacing. I had a hunch the cps sensor was bad too..oh intuition, how I love you. Buying new disa and cps..great. Funny thing is, the car is idling fine?
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Old 11-19-2012, 06:10 PM   #2
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Why are you buying stuff that there is no code for?

If you have a large vacuum leak -- there is no code that I am aware of for this, by the way -- then the result will be a lean fuel mixture, and this will give multiple misfires. What are the 7 codes you have?

If your hunch was correct, there would be a code for the CPS.
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Old 11-19-2012, 06:16 PM   #3
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Code p1083 is for the large vacuum leak.
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Old 11-19-2012, 06:18 PM   #4
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The following codes are p1085, p1353, p1083, p0313..
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Old 11-19-2012, 06:21 PM   #5
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The engine vibrates slightly at start (bad cps symptom), obviously sluggish take off and then there's misfires which are common from a bad cps. The day I took the disa off the butterfly was loose/broken and the seal/o'ring was nearly flat. It's so obvious these two parts are goners.
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Old 11-19-2012, 06:22 PM   #6
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You really have to slow down a bit.

First if your MAF is an unknonw brand, there are many MAF's out there that are showing up on 6 cylinder BMW's that under report the airflow and then you end up with lean codes and lean conditions.

CPS will not usually trigger lean codes, just CPS codes and/or loss of power under hard acceleration and possibly strange, straining exhaust noise.

I think you really need to concentrate your efforts into a single thread, otherwise you will get a lot of contradictory suggestions.
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Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 11-19-2012, 06:37 PM   #7
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Quote:
Originally Posted by UDM-E46 Enthusiast View Post
The engine vibrates slightly at start (bad cps symptom), obviously sluggish take off and then there's misfires which are common from a bad cps. The day I took the disa off the butterfly was loose/broken and the seal/o'ring was nearly flat. It's so obvious these two parts are goners.
None of the codes you report should send you to the CPS.

You have two codes for lean, P1083 and P1085, a Misfire with Fuel Cut Off, P1353, and a Misfire with Low Fuel. ALL OF THE MISFIRE CODES HAPPEN BECAUSE OF THE LEAN. Solve your fuel delivery issues and leave the CPS alone. You have either low fuel OR high air, this makes the fuel mixture lean.

If the MAF you are using is no good, then you will easily have the problems you are having. The MAF can tell the computer that the air is thin, and the computer will reduce the fuel to maintain a mixture of 14.7 parts of air to each part of fuel. If the air is dense, then the result will be a lean mixture. You need to figure out why the fuel ratio is lean, the CPS is not part of your problem.
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Old 11-19-2012, 06:40 PM   #8
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Siemmens maf here, brand new.
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Old 11-19-2012, 06:43 PM   #9
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Originally Posted by UDM-E46 Enthusiast View Post
Siemmens maf here, brand new.
So what? Everything you report points to the MAF.

What you really need is a better diagnostic package.

There have been reports of poor connections of the pins in the connector, perhaps you should be looking here. Whatever the problem is, it isn't the CPS.
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Old 11-19-2012, 06:49 PM   #10
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Your reply's appreciated.
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Old 11-19-2012, 06:49 PM   #11
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CPS either hard fail and trigger codes for the CPS, or soft fail and you may get camshaft under or over advance codes, usually no misfires, just reduced performance.

If you have your original MAF, put it back on and see what happens.

Unplugging the MAF puts the DME into a fixed fuel map that is usually on the rich side to protect the engine.

Are you sure you have check for all the common vacuum leaks, these engines are full of them!!

DISA O-ring can also be a major source of problems if overlooked.

When are your problems, cold start? Or are you able to make it past cold start without issues?
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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

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Lower hose fan switch O-ring - BMW #13621743299
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Old 11-19-2012, 07:02 PM   #12
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With the new maf there has been a huge improvement. I really don't think that's the problem. The disa is obviously damaged, and obviously the seal isn't seating correctly due to it no longer being effective. Also, the diaphragm on the disa should probably be failing due to it's 10 year use. The camshaft position sensor has been causing slight vibration and there's obvious signs of power loss. Not only that, there's misfires. Previously, I tested the maf sensor and it tested failed/bad; it had a huge crack inside the sensor. It was easily visible. It's only so obvious. I greatly value your input, don't think I'm contradicting you.
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Old 11-19-2012, 07:04 PM   #13
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Vacuum leak other than the disa seal..where else would you suggest jd?
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Old 11-19-2012, 07:08 PM   #14
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And I had a bad maf code prior to this, there is another thread where I mention this, so it was bad and I needed to buy it.
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Old 11-19-2012, 07:10 PM   #15
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The vibration only occurs on a cold start. It nearly went away with the new maf, but it's still there. I also get a check oil light, but I know that's a faulty oil level sending unit sensor.
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Old 11-19-2012, 07:16 PM   #16
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I assume you have read the first link below in my signature?

I would still put the old MAF back on and compare to the new one. You have found many other issues that I think you have corrected since you put the new MAF on?

DISA intake seal can be a HUGE problem with cold start. If the DISA offers no resistance for the first 1/4" of removal, you need to put an O-ring on it even if you plan on replacing it. If the DISA basically falls out when the bolts are removed, the large round sealing surface is history.
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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

Last edited by jfoj; 11-19-2012 at 07:17 PM.
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Old 11-19-2012, 09:32 PM   #17
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Yea I'm sure the disa's leaking like a mofo.
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Old 01-19-2013, 12:53 AM   #18
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I just purchased the German solutions disa repair kit with the upgraded fluorosilicone oring and the exhaust/intake sensors. I'm hoping this clears all my codes ! : )
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Old 01-26-2013, 06:23 AM   #19
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Old 01-26-2013, 06:25 AM   #20
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I just finished replacing both the exhaust/intake camshaft position sensors along with the disa and it's newly installed gas unit. The vacuum diaphragm checked out fine after testing it so, no more check engine light!
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