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lt's and low end loss

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Old Mar 30, 2008 | 04:24 PM
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stil should change the muffs to get some low end back anyway.2cents
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Old Mar 30, 2008 | 04:42 PM
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Originally Posted by jakebdb56
Most likely it's your wiring. Somewhere I have a diagram of the O2 wiring on my computer. The signal wire is 0-1v, and I think the power for the heater is 12v. I'll look around.
Thanks, I'd appreciate it. I don't really want to spend the money on things I don't need. Truck is already costing me plenty.
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Old Mar 30, 2008 | 04:44 PM
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Originally Posted by ramsey rider
stil should change the muffs to get some low end back anyway.2cents
Yeah, I'm gonna pick up a couple flowmasters I think. If I dump the exhaust at the rearend, would it be loud in the cab. Right now I have the exhaust going out the side in front of the passenger tire, but don't think I have room for mufflers and going out the side.
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Old Mar 30, 2008 | 06:31 PM
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Originally Posted by jakebdb56
Most likely it's your wiring. Somewhere I have a diagram of the O2 wiring on my computer. The signal wire is 0-1v, and I think the power for the heater is 12v. I'll look around.
Yup, the voltage should constantly fluctuate from around 100 mV , high oxygen content = lean mixture, to 900 mV , low oxygen content = rich mixture, during closed loop operation. Look to see if you got a steady high or low voltage, in closed loop, or a inactive signal like a steady 450 mV. It shouldn't be steady in closed loop.. I also believe the heater circuit is straight up 12v.
Last edited by MustangPunk; Mar 30, 2008 at 06:36 PM.
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Old Mar 30, 2008 | 08:08 PM
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Originally Posted by timmer1
Yeah, I'm gonna pick up a couple flowmasters I think. If I dump the exhaust at the rearend, would it be loud in the cab. Right now I have the exhaust going out the side in front of the passenger tire, but don't think I have room for mufflers and going out the side.
There's a nice catback system that magnaflow makes that is a side exit, but if you're low on cash just do a single muffler dumped at the axle.

Originally Posted by MustangPunk
Yup, the voltage should constantly fluctuate from around 100 mV , high oxygen content = lean mixture, to 900 mV , low oxygen content = rich mixture, during closed loop operation. Look to see if you got a steady high or low voltage, in closed loop, or a inactive signal like a steady 450 mV. It shouldn't be steady in closed loop.. I also believe the heater circuit is straight up 12v.
The O2 that was bad in that 2002 truck would only max to about 550, but would still switch. The O2's still switch in OL too btw.

Like he said, if you do see that one of the O2's is reading a steady voltage after warmup you probably have a bad sensor. Wait until the engine warms up to start looking at the O2 readouts.
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Old Mar 30, 2008 | 08:22 PM
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Originally Posted by jakebdb56
The O2 that was bad in that 2002 truck would only max to about 550, but would still switch. The O2's still switch in OL too btw.

Like he said, if you do see that one of the O2's is reading a steady voltage after warmup you probably have a bad sensor. Wait until the engine warms up to start looking at the O2 readouts.
Yeah, they can be a pita to diag sometimes acting like that. Hopfully he's gotta buddy with a MT2500/Tech 2 or something. ;p I had a 94 or so F-150 come in one day, had been throwing HO2S codes all around, a new PCM and 1HO2S, and about day later, it was done acting up. I hate losing my *** on diag's.
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Old Mar 30, 2008 | 08:36 PM
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I've been looking into getting hptuner even tho I've already got my tune thru nelson performance. Maybe that will help me diagnose my issue. With any hope anyways.
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Old Mar 30, 2008 | 08:39 PM
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for what it's worth i also had a o2 sensor goin out on my 00"rcsb and it was causing some decent low end power loss as well. changed it and she ran a 13.7@99 with just bolt ons and some 4.10's.
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Old Mar 30, 2008 | 08:55 PM
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Originally Posted by TouchOfEvil04
for what it's worth i also had a o2 sensor goin out on my 00"rcsb and it was causing some decent low end power loss as well. changed it and she ran a 13.7@99 with just bolt ons and some 4.10's.
thats good to know
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Old Mar 30, 2008 | 09:55 PM
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Originally Posted by TouchOfEvil04
for what it's worth i also had a o2 sensor goin out on my 00"rcsb and it was causing some decent low end power loss as well. changed it and she ran a 13.7@99 with just bolt ons and some 4.10's.
6.0? that's quick for a 5.3 and just "bolt ons"
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