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Discussion Starter · #1 ·
So, for the last few months I've been experiencing much more popping exhaust than usual, and also about 20% increased fuel consumption.<br>So, I finally decided to clean the MAF with CRC MAF cleaner.<p>When I took the sensor out, I saw something was clearly missing. I didn't take a picture of it so here's one borrowed from the net:<p><IMG SRC="http://img36.imageshack.us/img36/7448/mafh.jpg" BORDER="0"><p>The thermistor was gone. So, I figured the computer thinks it's freezing cold weather all the time, and feeds the engine a richer mixture, am I correct?<p>Getting a new MAF tomorrow, hope it fixes the issue. I tried to get just a new thermistor, but it was pretty much impossible. And at Bosch service I got laughed at, so I had to buy the whole thing <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> <p>Just FYI, if you happen to experience similar symptoms. In hot weather areas it could be even worse.<br>It's easy to check, if you can open those tamper-proof screws on the MAF.
 

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Re: MAF issue (JS60R)

Maybe this is my issue. I just failed my emissions with a high NOx reading. <br>Their possible causes “high combustion pressure, high combustion temperatures, A/F running lean.”<br>I am running a 3” DP and exhaust, stock ECU. I just recently cleaned my BMC filter again so I know that side is good. I decided to pull out and clean the MAF. It was pretty dirty. I reinstalled it and had it re-tested as this was about as far as I could take things on my own. It failed again with the same readings.<p>My MAF did not have that glass thermistor installed in it. <br>Could this cause it to run lean? Or do you think it is probably not associated?<p>
 

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Re: MAF issue (JS60R)

Search for the thread I made on cleaning the MAF, mine didn't have one eihter.<p><A HREF="http://forums.swedespeed.com/zerothread?id=118610" TARGET="_blank">http://forums.swedespeed.com/zerothread?id=118610</A><p>2004 MAF in the pictures.
 

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Re: MAF issue (pioneer)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>pioneer</b> »</i></TD></TR><TR><TD CLASS="quote">Maybe this is my issue. I just failed my emissions with a high NOx reading<p>I am running a 3” DP <p></TD></TR></TABLE><br>I guarantee you put you original Cat back on you will pass the loaded dyno test.<p>If your engine was running lean enough to cause an emission failure of NOx, you would be getting a CEL which would fail it anyway. <p>If you have access to a 4 or 5-Gas Bench you can measure the catalytic converter 02 saturation and see if its up to par. But I would guess its a bad converter even though its not tripping the CEL.
 

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Discussion Starter · #5 ·
Re: MAF issue (chinaonnitrous1)

Maybe the R MAF doesn't have the thermistor afterall.. We'll see when I get the new one. It was delayed, so I'll get it next tuesday.<br>Luckily I was planning to replace it anyway. I'll let you know the results when I finally have it installed.
 

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Re: MAF issue (JS60R)

I don't see how you can just lose this thermistor. It should be soldered in. I've been having a lot of MAF troubles, though. I've gone through three of them in the last year! <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0">
 

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Re: MAF issue (art_werks)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>art_werks</b> »</i></TD></TR><TR><TD CLASS="quote">I don't see how you can just lose this thermistor...</TD></TR></TABLE><p>The car is getting its IAT info elsewhere.
 

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Discussion Starter · #8 ·
Re: MAF issue (MrTippy)

Ok finally an update on this after installation:<p>Thermistor isn't necessary in the R MAF. New one didn't have it either.<br>Exhaust popping is gone.<br>Fuel consumption went back down to "normal" level.<br>Smoother engine behavior overall.<p>Old MAF was very clean, but I guess it had just gotten old. Manufactured in march 2003.
 

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Re: MAF issue (JS60R)

Did you always run w/a stock air filter, or did you use a oiled filter? Curious... If stock air filter, this is a curious issue!!! How many miles do you have on the car?
 

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Discussion Starter · #10 ·
Re: MAF issue (Short Circuit)

K&N filter for the last 2 years. Never with oil, so the old MAF was extremely clean.<br>75k miles.<br>What makes it curious? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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Re: MAF issue (JS60R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JS60R</b> »</i></TD></TR><TR><TD CLASS="quote">...What makes it curious? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"></TD></TR></TABLE><p>I "thought" MAF's fail ONLY when used in connection with oiled (aftermarket) airfilters. At least that seems to be the trend on SS. <p>Maybe we need a poll on failed MAF's, and have non-oiled vs. oiled air filters as the choices. And when I mean oiled filters - I mean the use of an oiled filter ANYTIME during the life of the car. I have a theory that this is the base issue w/failed MAF's, but I could be very wrong. <p>If the MAF is a "sensor", then all sensors fail after XX miles. Maybe these MAF's need to be proactively replaced every 60K miles as a matter of course??
 

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Re: MAF issue (Short Circuit)

mine needed replacing @ 17,000mi never using an oiled filter<br>switched to Eurosport washeable @ 16k mi (it's not supposed to be oiled)<br>ok at 28k
 
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