MPG Getting Worse!
#22
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I did a bit of highway driving up in the mountains and I'm sure the going down part really helps my mileage plus I haven't had to use 4wd in a while and I got 17.5mpg out of this last tank which is high for me.
#23
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I'm going to take a closer look at things tonight. I got a new paper filter and am going to ditch the K&N, reclean the MAF and try to remove the o2 sensor. Anyone ever see one that was bad...what do I look for? I found replacements on Rockauto.com for between $80 and $250.
#24
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Originally Posted by emptypockets
Anyone ever see one that was bad...what do I look for? I found replacements on Rockauto.com for between $80 and $250.
A new O2 sensor and valve adjustment made a big difference in milage with my Honda Civic.
Last edited by alotawatts; 03-09-2006 at 08:24 AM.
#25
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Originally Posted by emptypockets
Anyone ever see one that was bad...what do I look for?
Here's a pic I found on the net claiming that these look "bad".
http://alflash.narod.ru/RX/Dsc01219.jpg
But actually, the only way to tell is to test them. Here're some words:
http://www.mr2.com/TEXT/O2_Sensor.html
I found replacements on Rockauto.com for between $80 and $250.
RockAuto does look like they're selling it (Denso 234-9002) for $30 less than URD. Cool.
#26
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Originally Posted by emptypockets
My 2002 3.4 MPG is slowly getting worse. About 6 months ago, it would do about 20 average of city and highway. That's down to about 15 now. I understand the cold plays some part in that, but not 5 mpg.
I've replaced the spark plugs, PCV valve, had the tires rotated and balanced and recently switched to 10w 30 Supertech Synthetic. About the only think I haven't done is the O2 sensor. Could that be the problem? Any ideas?
I've replaced the spark plugs, PCV valve, had the tires rotated and balanced and recently switched to 10w 30 Supertech Synthetic. About the only think I haven't done is the O2 sensor. Could that be the problem? Any ideas?
#27
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Um....yeah, already tried seafoam. I stopped by a local parts shop today and they said there's no way to clean the o2 sensor. They also said that there's no way seafoam can clog or ruin or clog the sensor. BS?
#29
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Originally Posted by emptypockets
Um....yeah, already tried seafoam. I stopped by a local parts shop today and they said there's no way to clean the o2 sensor. They also said that there's no way seafoam can clog or ruin or clog the sensor. BS?
A sensor _can_ get clogged/covered by oil spit that's a normal part of exhaust. If you look up how a sensor works, _all_ of the element that's in the middle needs to be able to react with the exhaust in order to get the most accurate reading. Cleaning that off could (not "will", "could") help. To clean that, soak it in brake cleaner - it's a great grease/grime remover.
And, since you've seen a Seafoam'd engine start after a couple of hours, think about all that stuff flying by the O2 sensor. It's inevitable that some will get on the sensor. See above for what to do about it.
Here's a bottom line... The idea of TRYING to clean the sensor is the difference between spending $3 on a can of brake cleaner versus $90 or $180 bucks on an O2 or A/FR sensor. You've got nothing to lose by trying to clean it. It won't restore the sensor to new (they degrade as a normal part of doing their job) but you may be able to stave off spending bigger bucks.
As a slighty beyatchy aside here... Given the days of time that we've been talking about the viability of cleaning it, you could have tried it already and possibly been back on the road smiling.
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