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Old 11-27-2007, 01:34 AM   #1
scraggy
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Default Cleaned MAF....all hell broke loose...

As the title says, all hell broke loose. At first the car wouldnt start, then when it did, it was adding fuel like crazy. I had to rework my latencies and scalar.

Thing is, I didnt think the MAF was that dirty at all, but I have never cleaned it before. I thought I was, but it turned out I was cleaning the intake temp sensor I guess.

Anyway, I took about an hour to get things figured out, but I still have a little more work to do. My original scalar was around 880 (modded injectors) and the latency at 14v was 1.04 I think. With that setup, after the cleaning, it was maxing out the a/f correction, adding as much fuel as it could. A/F at idle was like 18:1 on my wideband.

Now the scalar is at 780( I think I need to go to 800) and the latencies are much higher at 1.14 at 14v. I am going to play with it more tomorrow. A/F at idle is 14.5 ish and is running good at cruise. Idle correction learned is at +-.78 and it stays around that area. At cruise, it is taking out fuel at about 4-5% so I will deal with that next.

Anyone seen this happen this drastically before? I thought I messed up the maf when I cleaned it, but my wideband is corresponding with all the changes the ecu makes. Also, the factory o2 sensor is telling the same story. I guess I was tuning with a dirty maf the whole time.

Input if you got something.

Thanks
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Old 11-27-2007, 01:57 AM   #2
a6n6d6y
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you might try getting a new MAF sensor, I'v read "cleaning" those is BADDD
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Old 11-27-2007, 02:57 AM   #3
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you can definitely clean them, but i havent heard of them making such huge changes. it is possible to damage them when cleaning them so that might be a possibility.
how did you clean it?
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Old 11-27-2007, 07:28 AM   #4
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you CAN and SHOULD clean them with NON chlorinated brake cleaner.
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Old 11-27-2007, 07:37 AM   #5
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Quote:
Originally Posted by Wrinkleboi View Post
how did you clean it?


and +1 for non-chlorinated brakleen.
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Old 11-27-2007, 07:50 AM   #6
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and +1 for non-chlorinated brakleen.
+1 for the above mentioned
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Old 11-27-2007, 08:49 AM   #7
scraggy
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All I used was a q-tip. I didn't have any of the correct cleaner at the house when I decided to do it.

I don't think I damaged it because the maf voltage seems to be normal, but I will try it out with a known working one first chance I get.
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Old 11-27-2007, 10:42 AM   #8
SBW
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Quote:
Originally Posted by scraggy View Post
All I used was a q-tip. I didn't have any of the correct cleaner at the house when I decided to do it.

I don't think I damaged it because the maf voltage seems to be normal, but I will try it out with a known working one first chance I get.
yea, that might not have done much, you're probably alright though and didnt damage it.

Get a large plastic bag, some of the brakleen mentioned above. Fill it up, put your MAF in there, swish it around for a while, let it dry and then try it. You're right though, it probably does need to be cleaned.
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Old 11-27-2007, 10:47 AM   #9
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Theres electronic cleaner and MAF cleaner that may be your best bet
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Old 11-27-2007, 10:59 AM   #10
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You didn't put it in backwards, did you.?
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Old 11-27-2007, 01:10 PM   #11
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Quote:
Originally Posted by xrocket21 View Post
Theres electronic cleaner and MAF cleaner that may be your best bet
CRC makes a MAF specific cleaner.Found at most autostores.I hope you kept a copy of your original tune.
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Old 11-27-2007, 01:15 PM   #12
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Originally Posted by dumdum View Post
CRC makes a MAF specific cleaner.Found at most autostores.I hope you kept a copy of your original tune.

I used to have some around here somewhere, must have used it all. Car is running real good, a/f targets are still a off on the rich side, so I can raise the scalar to 800cc I think. Otherwise, using the spreadsheets, the latency looks pretty good, not quite a horizontal line, but close enough for gubment work.

I think if I had damaged it, the maf would be all wacky and I wouldnt get it to idle at all, much less hit expected targets.
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Old 11-27-2007, 04:24 PM   #13
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Check the air temp reading (log data). If you broke the sensor it will read very cold.
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Old 11-27-2007, 05:10 PM   #14
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Check the air temp reading (log data). If you broke the sensor it will read very cold.

Didn't think of that, will do!
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Old 11-27-2007, 09:05 PM   #15
scraggy
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I think the MAF is working fine, IAT is good and things are reading like they should and a/f is good now.
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Old 11-27-2007, 09:32 PM   #16
a6n6d6y
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Quote:
Originally Posted by a6n6d6y View Post
you might try getting a new MAF sensor, I'v read "cleaning" those is BADDD
nothin like being wrong...

http://www.amazon.com/CRC-Mass-Flow-.../dp/B000EGH57G
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Old 12-02-2007, 12:45 PM   #17
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This happened to me before, one of the things that causes the problem is cleaning the maf when you just pulled it out from a hot engine bay. The temp readings go out of sync and when the car is already warm the maf sensor may be cold from the solution you used to clean it.

Its advisable to clean the maf when the car is clean. Also dont clean it to regular as not all the liquid will evaporate from the sensor. This can cause small corrosion under hot enviornments.
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Old 12-02-2007, 01:03 PM   #18
scraggy
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Quote:
Originally Posted by riderz View Post
This happened to me before, one of the things that causes the problem is cleaning the maf when you just pulled it out from a hot engine bay. The temp readings go out of sync and when the car is already warm the maf sensor may be cold from the solution you used to clean it.

Its advisable to clean the maf when the car is clean. Also dont clean it to regular as not all the liquid will evaporate from the sensor. This can cause small corrosion under hot enviornments.
In this particular case, I didn't use any cleaning solution and the car was cool by the time I restarted the car again. I don't think the MAF had ever been cleaned correctly before and I had always wondered why my settings were so different from others when it came to scalar and latencies. Now, they are very simular.
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Old 12-02-2007, 02:06 PM   #19
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Great job man!!!
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Old 12-02-2007, 03:38 PM   #20
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this is what it looks like
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