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Old 06-19-2009, 01:10 PM   #1
xlash
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MAF cleaner

The idle in my car seems to be rough. It's barely noticeable and lasts for a few seconds after startup but I want to fix it before it gets worse.

My first course of action would be to clean the MAF but I am not sure where to get the CRC MAF sensor cleaner. I know some of you are familiar with this cleaner and/or substitutes so if you could provide me with a list of substitutes, where I can purchase them and for how much I'd really appreciate it.

Hopefully it's the MAF otherwise I'll have to get Bosch spark plugs.
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Old 06-19-2009, 01:13 PM   #2
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I purchased mine at Napa Auto Parts. If your MAF is starting to go bad, it will need replacing. Hopefully its just dirty.
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Old 06-19-2009, 01:21 PM   #3
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Damn! I thought there would be worse symptoms such as CEL and stalling that would require MAF replacement. Is the stealership the only place to get a new MAF?
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Old 06-19-2009, 01:41 PM   #4
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Quote:
Originally Posted by xlash View Post
Damn! I thought there would be worse symptoms such as CEL and stalling that would require MAF replacement. Is the stealership the only place to get a new MAF?
Nope!

If it`s a Bosch unit, you need to call your nearest Bosch parts dealer. Give them the part number. I paid $380 three years ago including delivery for my M3. Stealership wanted well over $800.
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Old 06-19-2009, 01:42 PM   #5
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Quote:
Originally Posted by xlash View Post
The idle in my car seems to be rough. It's barely noticeable and lasts for a few seconds after startup but I want to fix it before it gets worse.

My first course of action would be to clean the MAF but I am not sure where to get the CRC MAF sensor cleaner. I know some of you are familiar with this cleaner and/or substitutes so if you could provide me with a list of substitutes, where I can purchase them and for how much I'd really appreciate it.

Hopefully it's the MAF otherwise I'll have to get Bosch spark plugs.
I believe the 2003 and 1993 325 have the same part number, i will have to check. If they are I have one here.
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Old 06-19-2009, 01:47 PM   #6
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I cleaned my MAF and i bought the solution at NAPA also. It didn't make a difference! I also changed my plugs a few weeks ago, they were so dirty and looked like shit!! but that made no difference also!

I really wanted to see a difference
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Old 06-19-2009, 02:30 PM   #7
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Check for vacuum leaks
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Old 06-19-2009, 02:37 PM   #8
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This sounds disappointing. My car has 70,000km. I really don't want to start doing Inspection II stuff now. Guess I am running out of options.
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Old 06-19-2009, 02:47 PM   #9
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don't be disappointed! My car usually runs a little rougher when i turn the AC on.... even with the AC off i could notice a slight roughness but that might just be me being picky!

But my next check will be a vacuum leak check! it's good to find the problem sooner then later!
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Old 06-19-2009, 02:48 PM   #10
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Try cleaning the MAF since its so cheap and painless.... and then change the plugs... see if that makes any difference for your car!
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Old 06-19-2009, 04:38 PM   #11
xlash
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MAF cleaned, problem gone. I'll start it up again tomorrow morning when the engine is cold and then see if I get the same problem.
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Old 06-19-2009, 05:25 PM   #12
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clean the MAF with brake clean; it evaporates all most immediately; and dejunks/removes deposits and oil if any.
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1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
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latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 06-19-2009, 08:27 PM   #13
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if your MAF is gone you will notice that your km to gass ratio is decreasing, since you will be running rich. Also engine jerking while driving, and or stalling when at idle.
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