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Piss poor MPG and a real bad smell...
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rkymtnrider
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PostPosted: Sat Feb 06, 2010 3:57 pm    Post subject: Piss poor MPG and a real bad smell... Reply with quote

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.
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SteveVanB
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PostPosted: Sat Feb 06, 2010 4:05 pm    Post subject: Reply with quote

Sounds like your oxygen sensor gave up the ghost.
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Randy in Maine
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PostPosted: Sat Feb 06, 2010 4:06 pm    Post subject: Reply with quote

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
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PostPosted: Sat Feb 06, 2010 4:08 pm    Post subject: Reply with quote

Also consider checking your Coolant Temp Sensor.
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shorepig
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PostPosted: Sat Feb 06, 2010 6:30 pm    Post subject: Reply with quote

Oxegen sensor x2
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rkymtnrider
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PostPosted: Sat Feb 06, 2010 7:15 pm    Post subject: Reply with quote

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?
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Carleton
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PostPosted: Sat Feb 06, 2010 7:16 pm    Post subject: Reply with quote

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.....
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thummmper
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PostPosted: Sat Feb 06, 2010 7:23 pm    Post subject: Reply with quote

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
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PostPosted: Sat Feb 06, 2010 7:39 pm    Post subject: Reply with quote

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.
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Wildthings
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PostPosted: Sat Feb 06, 2010 8:06 pm    Post subject: Reply with quote

Check to see if the signal lead to the O2 sensor is grounded out.
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SteveVanB
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PostPosted: Sat Feb 06, 2010 8:17 pm    Post subject: Reply with quote

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
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hdenter
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PostPosted: Sat Feb 06, 2010 8:27 pm    Post subject: Reply with quote

$100 for an O2 sensor Shocked ... Try $20 at Van Cafe Very Happy
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240Gordy
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PostPosted: Sat Feb 06, 2010 8:27 pm    Post subject: Reply with quote

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.
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SteveVanB
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PostPosted: Sat Feb 06, 2010 8:32 pm    Post subject: Reply with quote

sorry, I meant <$100 I've never paid >$100 for one, but have seen them for sale ^$100 Rolling Eyes
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SteveVanB
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PostPosted: Sat Feb 06, 2010 8:35 pm    Post subject: Reply with quote

Ya, probably got that al fv<^>ed up too, or is it also..... Shocked
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Terry Kay
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PostPosted: Sat Feb 06, 2010 10:27 pm    Post subject: Reply with quote

After you get done throwing parts at the engine, and it still runs the same, do post what you have done so far..
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rkymtnrider
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PostPosted: Sat Feb 06, 2010 11:06 pm    Post subject: Reply with quote

Hoping to do it right the first time if you know what I mean TK.
Got any suggestions?
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Terry Kay
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PostPosted: Sun Feb 07, 2010 2:15 am    Post subject: Reply with quote

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.
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morymob
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PostPosted: Sun Feb 07, 2010 5:21 am    Post subject: Reply with quote

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
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PostPosted: Sun Feb 07, 2010 8:19 am    Post subject: Reply with quote

any luck, rkymtnrider?
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