cats
08-11-2011, 07:15 AM
#11
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Have you had the code/s scanned to see what they are? Most auto parts stores these days like Autozone will scan the codes for you.
Without the cats you will get a CEL from the rear O2s freaking out without the cats being there but other than that shouldn't have any other ill effects, truck should run just fine.
08-11-2011, 01:04 PM
#14
08-11-2011, 05:21 PM
#15
Forgot to add Klug's to that list of good tuners, sorry buddy 
Sounds like you're in limp mode, which shouldn't happen with just gutted cats, something else might be going on...as mentioned above, maybe one of the front O2 sensors is unplugged?
Yes, that's another option, but they're pretty hard to find as they passed legislation that made O2 sims illegal a few years ago. Some guys also use spark plug defoulers, which moves the rear O2 out of the exhaust stream, and it seems to have worked for at least a few guys here. There once was some a thread with some pics of them, but I can't seem to find it now.
IMO, getting a custom tune is the best, and easiest way to go. You get the benefits of the custom tuning, get the rear O2's tuned out, and don't have any physical or visual evidence that anything's going on
Sounds like you're in limp mode, which shouldn't happen with just gutted cats, something else might be going on...as mentioned above, maybe one of the front O2 sensors is unplugged?
Originally Posted by Hemi Killer
You could get O2 simulators...
IMO, getting a custom tune is the best, and easiest way to go. You get the benefits of the custom tuning, get the rear O2's tuned out, and don't have any physical or visual evidence that anything's going on
08-12-2011, 07:31 AM
#17
Not necessarily, some faults aren't picked up until their monitors run, and once the monitors do run, the PCM picks up the fault and and employs the necessary strategy (like limp mode), and turns on the CEL. I've left sensors unplugged on vehicles and driven for many miles until I've gotten a CEL and limp mode if necessary. Doesn't really make sense to me, you'd think that an open circuit would be an instant CEL (sometimes it is), but I've seen otherwise in the field.
08-12-2011, 08:00 AM
#19
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The P0151 is a code for the O2 sensor before the cat on bank 2 which is the passenger side.
The P0171 and P0174 if I remember just off the top of my head are both codes for an overly lean condition. You don't by any chance have any bad exhaust leaks right near the O2s before the cats do you?
The P0171 and P0174 if I remember just off the top of my head are both codes for an overly lean condition. You don't by any chance have any bad exhaust leaks right near the O2s before the cats do you?
08-12-2011, 08:21 AM
#20
The P0151 is a code for the O2 sensor before the cat on bank 2 which is the passenger side.
The P0171 and P0174 if I remember just off the top of my head are both codes for an overly lean condition. You don't by any chance have any bad exhaust leaks right near the O2s before the cats do you?
The P0171 and P0174 if I remember just off the top of my head are both codes for an overly lean condition. You don't by any chance have any bad exhaust leaks right near the O2s before the cats do you?