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dak1
Dodge Dakota
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9/09/2002
11:26:12
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 Subject: o2 sensor location...
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Message:
on the 99 R/Ts i noticed there is 3 o2 sensors one on each pipe below manifolds and one in cat..i'm planning on running tru duals with two hi flow cats and flowmasters and was wondering where to place the 3rd sensor..anywhere after the cats?? or do i need one of those "kat boxes"...
thanks for the info...
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dak1
Dodge Dakota
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9/10/2002
00:20:55
|  RE: o2 sensor location...
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Message:
??????
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dak1
Dodge Dakota
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9/10/2002
00:23:09
| RE: o2 sensor location...
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Message:
??????
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polchartude
Dodge Dakota
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9/10/2002
06:19:27
| RE: o2 sensor location...
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Message:
u don't even need the cat. toss it. leave the o2 sensor in.(anywhere)and remove the pcv vlve and hose from ur valve cover to the intake. put a breather on the vlv. cover and a vac cap on the intake. there is no real reason to even have a cat if ur not burning the crankcase fumes. and yes u will get a good voltage reading from the 02 to the pcm
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CW
GenIII
9/10/2002
09:00:59
|  RE: o2 sensor location...
IP: Logged
Message:
LOL you are funny. If you remove the cat you can end up with rouph idle and check engine lighs. You can get a 02 simulator from speedtweaks.
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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polchartude
Dodge Dakota
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9/10/2002
09:10:49
| RE: o2 sensor location...
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Message:
CW, I havn't had a cat on my 98 in over a year with no mil light or codes.The only reason for the cat in the first place is to burn the fumes and emisions mostly from the crank case, and I don't have an o2 sim. don't need one cause without the pcv being sucked into the Tb it allows the tb to increase 02 level
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CW
GenIII
9/10/2002
14:18:49
| RE: o2 sensor location...
IP: Logged
Message:
I didn't say you would end up with a mil light I said it can end up with a check engine light. The cat has nothing to do with crankcase vapors. That is what I was lauphing about.
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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dak1
Dodge Dakota
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9/10/2002
22:45:20
| RE: o2 sensor location...
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Message:
ok, but i will be running two cats so i'm assuming after the cats is fine?...
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CW
GenIII
9/11/2002
09:19:45
| RE: o2 sensor location...
IP: Logged
Message:
Are you sure you have precats on a 99' far as I know they weren't introduced until 2001. You can give it a try without the O2 simm but you have been warned. Poor fuel milage is part that may happen as well.
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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dak1
Dodge Dakota
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9/11/2002
22:40:05
|  RE: o2 sensor location...
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Message:
i looked under truck again and this is what i saw ..dual pipes coming off manifolds going into 1 cat then single outlet from cat into muffler..o2 on each pipe and on on back of cat...nothing else...so i'll try installing last sensor after cat..what the hell...ill give it a try...thanks for the info...
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BENDER
Dodge Dakota
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9/12/2002
01:49:33
| RE: o2 sensor location...
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Message:
the o2 sensor behind the last cat is to measure the how well the converter is funtioning. all trucks and cars after 1996 have obII and taking the o2 sensor out usually will set a code putting the check engine light on and i think the computer may try to compensate for this.
also technically it is illegal to alter fed emisions even putting extra converters on my state checks this. good luck
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