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rkymtnrider Samba Member
Joined: May 11, 2009 Posts: 125 Location: Bozeman, MT
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Posted: Sat Feb 06, 2010 3:57 pm Post subject: Piss poor MPG and a real bad smell... |
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The title pretty much sums it up.
My MPG is down to about 10-13.
The smell of the exhaust is overpowering.
Seems to run like a champ though.
Looking for suggestions on where to start looking for problems. _________________ 1984 Westy 1.9 manual
Craig Kelly is my copilot |
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SteveVanB Samba Member
Joined: June 01, 2008 Posts: 1645 Location: This side of Daytona
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Posted: Sat Feb 06, 2010 4:05 pm Post subject: |
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Sounds like your oxygen sensor gave up the ghost. _________________ 91 CARAT |
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Randy in Maine Samba Member
Joined: August 03, 2003 Posts: 34890 Location: The Beach
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Posted: Sat Feb 06, 2010 4:06 pm Post subject: |
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I would start by looking at the igniton system to make sure it is all it can be, then for vacuum leaks, and then correct fuel pressure. |
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sc-surfer Samba Member
Joined: May 16, 2005 Posts: 865 Location: Santa Cruz, CA
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shorepig Samba Member
Joined: November 30, 2005 Posts: 516 Location: Vancouver, B.C.
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Posted: Sat Feb 06, 2010 6:30 pm Post subject: |
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Oxegen sensor x2 _________________ 85 Westy
92 Mitsubishi Mighty Max 4x4 V6
74 Honda CB500T cafe racer
2013 ktm 690r
Sector nine pintail |
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rkymtnrider Samba Member
Joined: May 11, 2009 Posts: 125 Location: Bozeman, MT
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Posted: Sat Feb 06, 2010 7:15 pm Post subject: |
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I just read the Bentley method of checking the O2 sensor for defectiveness and have a couple of questions.
1st a little disclaimer: I have owned my van for just under a year and have opened this book less than 10 times. It kind of intimidates me. Not that I'm scared of doing work on my vehicle but rather I'm nervous that I will interpret the book wrong and F something up. There is a shit load of info in that book. I wouldn't say I'm not mechanically inclined, just inexperienced, but very much wanting to learn.
So here we go...
-Do I have a digifant or digijet?
-Do I need CO testing equipment to check for a bad O2 sensor?
-If faulty, how much is a new O2 sensor and where do I get one? _________________ 1984 Westy 1.9 manual
Craig Kelly is my copilot |
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Carleton Samba Member
Joined: January 05, 2010 Posts: 73 Location: Edwards, CO
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Posted: Sat Feb 06, 2010 7:16 pm Post subject: |
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I'm also getting terrible mileage- 10-12mpg.
I don't really know what rich fuel smells like...
It's got a new muffler/cat/O2 sensor by the prior owner, now with less than 100o miles on it. Outside of the muffler is clean to the touch, the inside is super sooty. Not sure where to start for mine, other than ignition, vacuum leaks, or fuel pressure..... _________________ '87 Vanagon Wolfsburg Weekender |
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thummmper Samba Member
Joined: November 25, 2009 Posts: 2015 Location: Meadow Valley, California Republic
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Posted: Sat Feb 06, 2010 7:23 pm Post subject: |
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your tail pipe should have a coffee brown residue inside. it's probably black from your description. take it to a trained mech. youlle be glad in a couple of days and you will have helped the economy rebound. you have more important things to do, don't you? |
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rkymtnrider Samba Member
Joined: May 11, 2009 Posts: 125 Location: Bozeman, MT
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Posted: Sat Feb 06, 2010 7:39 pm Post subject: |
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thummmper wrote: |
. take it to a trained mech. youlle be glad in a couple of days and you will have helped the economy rebound. you have more important things to do, don't you? |
Well, transportation is fairly up there on the importance list and I have been helping out the economy: I fill up twice as often as I used to.
I'd like to get it figured out sooner rather than later and I'd like to learn more about my van. So thuumper, If you can offer anything useful I'd appreciate it. _________________ 1984 Westy 1.9 manual
Craig Kelly is my copilot |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50336
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Posted: Sat Feb 06, 2010 8:06 pm Post subject: |
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Check to see if the signal lead to the O2 sensor is grounded out. |
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SteveVanB Samba Member
Joined: June 01, 2008 Posts: 1645 Location: This side of Daytona
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Posted: Sat Feb 06, 2010 8:17 pm Post subject: |
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Quote: |
you have more important things to do, don't you? |
It's cheaper to spend time....Turn off Leno and get to know "Bentley"!
1)digijet
2)no
3)@$100 _________________ 91 CARAT |
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hdenter Samba Member
Joined: October 14, 2008 Posts: 2753 Location: San Luis Obispo, CA
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Posted: Sat Feb 06, 2010 8:27 pm Post subject: |
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$100 for an O2 sensor ... Try $20 at Van Cafe _________________ '79 triple white convertible bug
'84 sunroof vanagon
'85 weekender |
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240Gordy Samba Member
Joined: May 15, 2008 Posts: 2354 Location: Vancouver, BC
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Posted: Sat Feb 06, 2010 8:27 pm Post subject: |
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super easy way to check the O2 sensor IIRC is just unplug it. If it drives the same it is bad, if it gets worse it is okay.
look to see if the the fine braided wires that sheild it (that is what makes it fat) are contacting the wire conductor, that will ground the signal and no feedback will go to the ECU. _________________ Tencentlife said,
"So, now that you know what you're doing, go to town."
2010 GOLF TRENDLINE 2.5
1985 GL now with more! a 2.1L
H&R SPORT(RED) Springs FRONT , SLAM SPECIALTIES RE6 AIRBAGS REAR |
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SteveVanB Samba Member
Joined: June 01, 2008 Posts: 1645 Location: This side of Daytona
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Posted: Sat Feb 06, 2010 8:32 pm Post subject: |
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sorry, I meant <$100 I've never paid >$100 for one, but have seen them for sale ^$100 _________________ 91 CARAT |
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SteveVanB Samba Member
Joined: June 01, 2008 Posts: 1645 Location: This side of Daytona
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Posted: Sat Feb 06, 2010 8:35 pm Post subject: |
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Ya, probably got that al fv<^>ed up too, or is it also..... _________________ 91 CARAT |
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Terry Kay Banned
Joined: June 22, 2003 Posts: 13331
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Posted: Sat Feb 06, 2010 10:27 pm Post subject: |
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After you get done throwing parts at the engine, and it still runs the same, do post what you have done so far.. _________________ T.K. |
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rkymtnrider Samba Member
Joined: May 11, 2009 Posts: 125 Location: Bozeman, MT
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Posted: Sat Feb 06, 2010 11:06 pm Post subject: |
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Hoping to do it right the first time if you know what I mean TK.
Got any suggestions? _________________ 1984 Westy 1.9 manual
Craig Kelly is my copilot |
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Terry Kay Banned
Joined: June 22, 2003 Posts: 13331
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Posted: Sun Feb 07, 2010 2:15 am Post subject: |
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While I agree that it 'could' be the temp II sensor, or the oxy sensor, this in myopinion shouldn't be the first place to start in your discovery mission.
The trottle body switches are a on-off all day happening and are the first place to check for functioning & adjustment, as they are a wear item.
It's the easiest place to start, and primary to the rest of the toss at the van items.
Make sure the switches are adjusted, functioning properly--then go to the other items mentioned.
The TPS should always be the first place to start when your in this sort of situation. _________________ T.K. |
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morymob Samba Member
Joined: November 09, 2007 Posts: 4683 Location: east-tn
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Posted: Sun Feb 07, 2010 5:21 am Post subject: |
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OX sensor about $25 at Advance store,probably close to that atA-Zone,have been Bosch brand. Unhook oxy sensor wire,it has a plug and see if any change, if none sensor either bad , center wire shorted at shield(very common), check center wire all way to ecu plug. Inves t about $20 for a meter with the Needle face,digital has it's place but u can't measure a voltage that's not steady. Temp-2 sensor may be staying in enriched/cold level keeping fuel mix richer. |
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j8 Samba Member
Joined: August 13, 2003 Posts: 575 Location: Minneapolis, MN
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Posted: Sun Feb 07, 2010 8:19 am Post subject: |
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any luck, rkymtnrider? _________________ Julia
'89 2WD Westy (No end to names...) |
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