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Gonna clean the MAF sensor myself

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Old 07-08-2009, 02:23 PM   #16  
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Thanks, I'm pretty sure my local Napa store should have MAF cleaner. The alcohol should have been good, though, it was "denatured alcohol" from home depot. Still, I will do it one more time, using Electrical contact cleaner or MAF cleaner.
Those cleaners also are pressurized which adds a bit of "power" to the cleaning process. Might help knock off any stray bits...
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Old 07-09-2009, 06:03 AM   #17  
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My #1 thing to check at this point would definitely be the vacuum tube!

After that look carefully at everything between the maf to the intake manifold connection. If there was an air leak between the two the maf would see a certain amount of airflow going past it but additional air would be added where the leak is causing the system to go lean. Look for cracks in hoses and the connecting tube between both. Take it in a quiet area and listen for hisses. Move hoses and see if you can cause a hiss to come and go. BE CAREFUL WHERE YOU STICK YOUR HAND!!!
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Old 07-12-2009, 10:07 PM   #18  
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Thanks, I'm pretty sure my local Napa store should have MAF cleaner. The alcohol should have been good, though, it was "denatured alcohol" from home depot. Still, I will do it one more time, using Electrical contact cleaner or MAF cleaner.
What's up now ?

Did it work out to clean the MAF sensor yourself ?

Did it turn out to be a waste of time ?
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Old 07-13-2009, 05:53 AM   #19  
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What's up now ?

Did it work out to clean the MAF sensor yourself ?

Did it turn out to be a waste of time ?
Nothing up yet. Still driving with the CEL on, still driving while overdue for inspection. I haven't haven't had a moment to clean it. Wife and kids are heading out of town for 5 days later this week, so I will be able to clean it again and all that. I'll post what happens...
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Old 07-22-2009, 06:48 AM   #20  
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I cleaned it again on Monday afternoon. Used almost a whole can of official MAF cleaner. Drove it a bit that evening, but not long enough for all the systems to finish their diagnostics. Drove to work this morning, and no pending codes! The pattern has been that I will get a pending too lean code if the 2A finishes it's diagnostics. Every time, so it seems that my problem is really the MAF, since the only 2 times I've had no pending code after all the systems have run their check is after I cleaned it.

So I'll keep my fingers crossed. I think I'll try and drive to an inspection station. Best case, I'll have no codes or pending codes and hopefully pass with flying colors. 2nd case: by the time I get there, the CEL light will be off, but a pending code stored in the system which has been the pattern. I'm not sure of the criteria here in NJ, but I know that some states will pass cars that have just 1 pending code, depending on which system threw the code. Worst case, the light comes on and I fail. Which seems unlikely, because again, it takes 2 trips for the too lean code to trigger the light. 1 trip to show a pending, and 1 to trip the light.

So since I have no pending, I think my next trip should be nothing other than heading to inspection! Wish me luck!
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Old 07-22-2009, 10:57 AM   #21  
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I'm back from inspection.

I PASSED! THE FREAKING CAR IS FIXED!



A long trip to the inspection station. A long trip back to work, and still no codes in the computer. I can not get over the fact that I troubleshooted, diagnosed, and removed a critical piece of hardware from my engine. Cleaned it and got it all back together again. TWICE!

For many gear heads removing the maf sensor is a very easy thing, but for me it felt about as much as I would comfortable do to my engine. For one I am happy just to get past inspection, but I am even more giddy that I fixed my own check engine light that has been on for two years, myself, on the cheap!
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Old 07-23-2009, 11:29 AM   #22  
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The light will be back, promise. You put a bandade on a wound that needs stiches. Cleaning the MAF yourself will not fix your problem, a new one will.
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Old 07-23-2009, 11:38 AM   #23  
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The light will be back, promise. You put a bandade on a wound that needs stiches. Cleaning the MAF yourself will not fix your problem, a new one will.
I'd agree if the problem is indeed a failing MAF. But if dirt/oil on the sensor is the culprit, how the heck is cleaning it a "bandade"? I've driven it a bunch today, and still no codes. So please explain your reasoing on what is the problem that needs stiches.
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Old 07-23-2009, 01:23 PM   #24  
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I'd agree if the problem is indeed a failing MAF. But if dirt/oil on the sensor is the culprit, how the heck is cleaning it a "bandade"? I've driven it a bunch today, and still no codes. So please explain your reasoing on what is the problem that needs stiches.
First, "bandade" is "bandaid," I know you didn't start it. If the problem was dirt or debris on the sensor, then you fixed it. Whatever allowed it to get dirty in the first place will happen again, but just clean it again. When people attempt to diagnose car EVAP/Emission type issues themselves, there really seems to be a massive amount of callbacks, or re-fixing the issue. I certainly hope that the MAF was just dirty. Good luck to you!
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Old 07-27-2009, 12:54 AM   #25  
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First, "bandade" is "bandaid," I know you didn't start it. If the problem was dirt or debris on the sensor, then you fixed it. Whatever allowed it to get dirty in the first place will happen again, but just clean it again. When people attempt to diagnose car EVAP/Emission type issues themselves, there really seems to be a massive amount of callbacks, or re-fixing the issue. I certainly hope that the MAF was just dirty. Good luck to you!
I apologize for my misspelling, thanks for correcting that... it might had not been understood.
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Old 07-27-2009, 01:02 AM   #26  
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I'd agree if the problem is indeed a failing MAF. But if dirt/oil on the sensor is the culprit, how the heck is cleaning it a "bandade"? I've driven it a bunch today, and still no codes. So please explain your reasoing on what is the problem that needs stiches.
What I'm saying is exactly that. If its broke, its broke. No miracle spray is going to fix your problem. If you understood the MAF and how it is built you would understand this, now in all fairness maybe you have something different then most of the one's I have been across. If so good luck. The "wire" or filament that runs from tip to tip in the MAF that reads air flow is real small (picture a hair) and if oil or dirt contaminate this it WILL be back. If it was ok to get small particles on it then it would be ahead of the air filter, not behind it getting protected.

Nissan Maxima 2000-2001 year models are notorious for MAF's failing, no recall, no Service Bulletin, no miracle spray to fix. Replacing the MAF was the only real fix to clear the CEL. I had it, cleaned it, been there done that, and buying a new one was the only thing that fixed my problem. 35,000 miles later still no light.
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Old 07-27-2009, 06:58 AM   #27  
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What I'm saying is exactly that. If its broke, its broke. No miracle spray is going to fix your problem. If you understood the MAF and how it is built you would understand this, now in all fairness maybe you have something different then most of the one's I have been across. If so good luck. The "wire" or filament that runs from tip to tip in the MAF that reads air flow is real small (picture a hair) and if oil or dirt contaminate this it WILL be back. If it was ok to get small particles on it then it would be ahead of the air filter, not behind it getting protected.

Nissan Maxima 2000-2001 year models are notorious for MAF's failing, no recall, no Service Bulletin, no miracle spray to fix. Replacing the MAF was the only real fix to clear the CEL. I had it, cleaned it, been there done that, and buying a new one was the only thing that fixed my problem. 35,000 miles later still no light.
Dirt is dirt. If it's clean, it's clean. Yes, it sits behind the air filter. But the filter doesn't stop 100% of dirt and grime. And I'm not sure if the filter that is in place is one of those heavily oiled filters that is notorious to coating the MAF with oil residue, causing the very problem I had. My car has 110,000 miles on it. Plenty of time for dirt to slowly build up on the MAF. As far as I know, this is the original MAF. I bought the car used at about 30,000 miles.

Still early, but 1 week and about 175 miles and still no CEL. Nothing lost at all by cleaning it. And if it does indeed fail, I can order it and put it in myself, saving $$$.
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Old 07-28-2009, 05:56 AM   #28  
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Congrats
It's got to be a good feeling!
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Old 07-28-2009, 07:15 AM   #29  
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Congrats
It's got to be a good feeling!
Thanks! It does. After driving a week, other noticeable improvements is smoother ride, quieter idle, reduced pinging in the engine (adding premium fuel helped, but it still pinged a bit. Pinging is completely gone now). Lots more power, especially when accelerating up a hill. So far I've used about half a tank, and so far have gotten 23.9 mpg, about 1mpg better than my previous best average.

Now I just gotta get an oil leak fixed! I think I'll leave that to the professionals...
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Old 07-31-2009, 06:40 AM   #30  
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Filled up yesterday. I got 24.4mpg on my last tank. That MAF cleaner spray in indeed miracle spray. Best $7 I have ever spent on my car.
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