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Dr
Dodge Dakota
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10/05/2007
18:22:27
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 Subject: o2 sensors
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Message:
I have been going though o2's sensors like every 2,000 miles I have a 1998 3.9 4x4 190,000 miles
Gas mileage now is 13-15. I am thinking maybe a bad cat or something I changed both 02 sensors at thr same time took a road trip and about 70 miles after changing the o2 sensors i start blowing black smoke and all spark plugs are missfiring i had a code reader hooked up to it.
Thank god everything was astill covered got to all changed again no charge now i am getting bad gas mileage No codes. Gas mileage is between 13-15 use to be 15-19
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wondering
Dodge Dakota
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10/05/2007
18:54:37
|  RE: o2 sensors
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Message:
98's have an EGR ?
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daddio
Dodge Dakota
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10/05/2007
19:12:44
| RE: o2 sensors
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Message:
no '98's don't have EGR's. problem could possibly be the MAP sensor.
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Trev1
Dodge Dakota
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10/05/2007
20:45:19
| RE: o2 sensors
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Message:
Plugged Cat Converter, could be a blown plenum gasket.
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Dr
Dodge Dakota
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10/06/2007
02:03:02
| RE: o2 sensors
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Message:
One of my bolts is missing from my exhaust manafold which could be the reason a get a p0420 code or clog cat. I can smell a weird odor from the exhaust not rotton eggs.
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pete
Dodge Dakota
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10/06/2007
08:50:07
| RE: o2 sensors
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Message:
I would go and get your cat. converter(s) check if you have 4 same espicially inspect left side sounds like its plugged or there and that exhaust bolt missing?? sounds like someone trying to realease back pressure building up, you might have some mechanical issues like excessive blowby bad rings,valve seals,guides ignition problems,injectors... endless answers dude check out your first and go from there
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