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Old 10-04-2019, 10:13 PM #16
sr3tlaw sr3tlaw is offline
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Quote:
Originally Posted by fulltimervexplorer View Post
What are you currently using to trick the 02 sensors? I was told by Blackout when i talked to him earlier that they dont make a plug and play for our vehicle hence why its not listed as a truck thats compatible. Why not use the J style o2 spacers?
IM pretty sure I still have my catalytic converters. Do you ?
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Old 10-05-2019, 08:53 AM #17
slyfox75 slyfox75 is offline
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[QUOTE=sr3tlaw;3366301]Thank goodness I found this thread. Especially since it's the famous @blackoutt

Doug Thoroughly Short Headers installed, think we bought them from the same group buy a while back actually. I'm running the URD Rear O2 Simulator, 2UZ-FE V8, 2005-2006, Dual Channel (O2 Sim Type E) = $149.00 that was on backorder for a while. Here is a link to the plug and play that works with our 2UZ-FE 4.7 V8

Just recently, like, RIGHT before INSPECTION too some codes were thrown - P0172 and P0175. I have the @slyfox75 Secondary Air Bypass Installed a couple years ago and the instructions mention to tamper with the wiring that goes into the MAF sensor. Could the included relay he provided go bad? Idk, just thoughts

Are these related? Maybe the URD Simulator took a dump and needs to be replaced; or the relay included in @slyfox75 End of Quote

@sr3tlaw ,
I'll be glad to assist to help troubleshoot. I've never heard of a bypass relay failing in the field but everything is possible. It potentially can fail open or closed.(I would think closed would be most probable). If stuck closed, its as if you have no relay/bypass and correct ambient air temp would be sent to ECU. If stuck closed.....it would send a very low ambient air temp to ECU....which maybe could get you a rich code. We can test this with multimeter, or you can unscrew one red connector and hook it back to factory wire(remove bypass from circuit and make like factory) to see if that changes anything. I also happen to have a MAF sensor I can send you to use for testing if you'd like, just PM me. Also Techstream should show your air temp if you have it(that's probably easiest way to ensure its right).
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Old 10-05-2019, 10:58 AM #18
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Quote:
Originally Posted by sr3tlaw View Post
Thank goodness I found this thread. Especially since it's the famous @blackoutt

Doug Thoroughly Short Headers installed, think we bought them from the same group buy a while back actually. I'm running the URD Rear O2 Simulator, 2UZ-FE V8, 2005-2006, Dual Channel (O2 Sim Type E) = $149.00 that was on backorder for a while. Here is a link to the plug and play that works with our 2UZ-FE 4.7 V8

Just recently, like, RIGHT before INSPECTION too some codes were thrown - P0172 and P0175. I have the @slyfox75 Secondary Air Bypass Installed a couple years ago and the instructions mention to tamper with the wiring that goes into the MAF sensor. Could the included relay he provided go bad? Idk, just thoughts

Are these related? Maybe the URD Simulator took a dump and needs to be replaced; or the relay included in @slyfox75

Already replaced the MAF sensor with OEM Toyota a few months back and that fixed the problem at the time.
@Blackout How can I get yall some more diagnostic information like those shown in the graph titled "Emissions Readiness s/DTC"


God, I love this site

Alright, lets look at this from a logical perspective. IF the slyfox bypass is installed correctly the only thing it will mess with is intake air temperature, therefore the bypass failing will not cause a MAF error and rich bank 1 and bank 2 faults (172, 175) without also causing an IAT fault. I've had my slyfox wiring come loose once after checking air filter, it caused an IAT fault, I fixed the wiring and it was resolved. I agree with slyfox that I don't think it's the bypass relay, they are quite simple and robust systems.

Now onto the simulator part.
You said you have the shorty headers, so do you have catalysts welded to them or straight pipes?
If you have catalysts welded to the shorty headers then no need for simulator unless you're logging p0430 and/or p0420 faults but not likely. Removed the simulator. Still logging faults? If yes then you have other issues such as an exhaust leak before the front O2 sensors, so maybe a gasket leak or bad install job of the headers? Or could also be a vacuum leak elsewhere, these usually flag some other faults as well though too.


If you have empty piping welded between the shorty headers and the y pipes then you need some sort of trickery on the REAR or sensors to prevent p0420 and/or p0430 faults. I was told by URD that the plug n play didn't work for our vehicles but I'm also assuming you have cats and don't need it anyway. It does not appear to be causing the issue because the faults that will log if it goes bad or is out of adjustment are the catalyst inefficiency p0420 and p0430 or REAR O2 sensor stuck high/stuck low, or slow switching. The faults you are logging are related to the FRONT or UPSTREAM O2 sensors. Which brings me back to.....do NOT install any spacers or simulators on the FRONT O2 sensors. This could very well be causing your issue. I know that DT and Jason B have been slinging misinformation about this but trust me those upstream sensors are seeing the correct exhaust stream just as factory without needed to be tricked. Any trickery of the front sensors will cause rich running p0172 p0175, poor fuel economy, and possible engine damage if ran long term. Send us some pics of where your upstream O2 sensors are mounted into your shorty headers and we should be able to resolve this question quickly.
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