Fire from exhaust !!
04-04-17, 12:24 PM
#16
Lexus Test Driver
04-04-17, 12:40 PM
#17
Former Sponsor
In the first video, it sounds like he is hitting the rev limiter. And when that happens, there's going to be a bit of raw fuel make it into the exhaust system, where it will at some point get ignited, and when that mixes with air, really cool flames are the result.
However, it sounds like the error code H02S sensor low circuit, is due to the catalysts being removed (which the OP mentioned), and therefore the sensor will not see what it expects post catalyst. That is ... if the sensor is even still there. Either way, with the sensor missing, or the lack of cats, the computer is not seeing what it is expecting on the downstream side of the cats.
I don't know where the rev limiter kicks in, I've never hit the rev limiter. Mine shifts automatically before the rev limiter. Which leads me to believe that your 2nd recording is pointing out the fact that it is hitting a rev limiter prior to where the trans if programmed to shift. Which sort of seems like maybe that could be a type of "limp mode" feature due to the downstream O2 sensor reading being off the chart for what is expected.
That and you have so many other warning lights happening. I for one wouldn't be trying to make high speed passes with low tire pressure. But, I don't know if it is for real low tire pressure, or if your ECU is just acting a bit goofy with everything else that's happening.
Interesting thread and videos. Outside of replacing the cats (to correct the downstream O2 signal), I wouldn't know how to fake the correct signal to the downstream sensors. I've heard of it being done on other cars, but don't know how it was achieved.
Jason Oliver
However, it sounds like the error code H02S sensor low circuit, is due to the catalysts being removed (which the OP mentioned), and therefore the sensor will not see what it expects post catalyst. That is ... if the sensor is even still there. Either way, with the sensor missing, or the lack of cats, the computer is not seeing what it is expecting on the downstream side of the cats.
I don't know where the rev limiter kicks in, I've never hit the rev limiter. Mine shifts automatically before the rev limiter. Which leads me to believe that your 2nd recording is pointing out the fact that it is hitting a rev limiter prior to where the trans if programmed to shift. Which sort of seems like maybe that could be a type of "limp mode" feature due to the downstream O2 sensor reading being off the chart for what is expected.
That and you have so many other warning lights happening. I for one wouldn't be trying to make high speed passes with low tire pressure. But, I don't know if it is for real low tire pressure, or if your ECU is just acting a bit goofy with everything else that's happening.
Interesting thread and videos. Outside of replacing the cats (to correct the downstream O2 signal), I wouldn't know how to fake the correct signal to the downstream sensors. I've heard of it being done on other cars, but don't know how it was achieved.
Jason Oliver
04-16-17, 10:37 PM
#18
Driver School Candidate
Thread Starter
In the first video, it sounds like he is hitting the rev limiter. And when that happens, there's going to be a bit of raw fuel make it into the exhaust system, where it will at some point get ignited, and when that mixes with air, really cool flames are the result.
However, it sounds like the error code H02S sensor low circuit, is due to the catalysts being removed (which the OP mentioned), and therefore the sensor will not see what it expects post catalyst. That is ... if the sensor is even still there. Either way, with the sensor missing, or the lack of cats, the computer is not seeing what it is expecting on the downstream side of the cats.
I don't know where the rev limiter kicks in, I've never hit the rev limiter. Mine shifts automatically before the rev limiter. Which leads me to believe that your 2nd recording is pointing out the fact that it is hitting a rev limiter prior to where the trans if programmed to shift. Which sort of seems like maybe that could be a type of "limp mode" feature due to the downstream O2 sensor reading being off the chart for what is expected.
That and you have so many other warning lights happening. I for one wouldn't be trying to make high speed passes with low tire pressure. But, I don't know if it is for real low tire pressure, or if your ECU is just acting a bit goofy with everything else that's happening.
Interesting thread and videos. Outside of replacing the cats (to correct the downstream O2 signal), I wouldn't know how to fake the correct signal to the downstream sensors. I've heard of it being done on other cars, but don't know how it was achieved.
Jason Oliver
However, it sounds like the error code H02S sensor low circuit, is due to the catalysts being removed (which the OP mentioned), and therefore the sensor will not see what it expects post catalyst. That is ... if the sensor is even still there. Either way, with the sensor missing, or the lack of cats, the computer is not seeing what it is expecting on the downstream side of the cats.
I don't know where the rev limiter kicks in, I've never hit the rev limiter. Mine shifts automatically before the rev limiter. Which leads me to believe that your 2nd recording is pointing out the fact that it is hitting a rev limiter prior to where the trans if programmed to shift. Which sort of seems like maybe that could be a type of "limp mode" feature due to the downstream O2 sensor reading being off the chart for what is expected.
That and you have so many other warning lights happening. I for one wouldn't be trying to make high speed passes with low tire pressure. But, I don't know if it is for real low tire pressure, or if your ECU is just acting a bit goofy with everything else that's happening.
Interesting thread and videos. Outside of replacing the cats (to correct the downstream O2 signal), I wouldn't know how to fake the correct signal to the downstream sensors. I've heard of it being done on other cars, but don't know how it was achieved.
Jason Oliver
i don't think that i am hitting the rev limiter , because the rev limiter will hit when rpm 6500
some one told me that may be the issue from the valve body
05-18-17, 10:30 AM
#19
Driver School Candidate
Thread Starter
Any suggestions about this problem
yesterday some one told me it is the transmission, but when i say ok do it but i will not give you money if it was not the transmission and he refuse because he is not sure 100% about the transmission
yesterday some one told me it is the transmission, but when i say ok do it but i will not give you money if it was not the transmission and he refuse because he is not sure 100% about the transmission
05-18-17, 10:36 AM
#20
It's not hitting the rev limiter. I'd bet on spark plugs, a bad ignition coil, or a bad ignition control module. An ignition system problem will produce the same conditions, and will damage catalysts due to raw fuel being dumped into the exhaust from the non-firing cylinders.
05-19-17, 03:21 PM
#22
It's not hitting the rev limiter. I'd bet on spark plugs, a bad ignition coil, or a bad ignition control module. An ignition system problem will produce the same conditions, and will damage catalysts due to raw fuel being dumped into the exhaust from the non-firing cylinders.
05-23-17, 12:46 AM
#23
Driver School Candidate
Thread Starter
It's not hitting the rev limiter. I'd bet on spark plugs, a bad ignition coil, or a bad ignition control module. An ignition system problem will produce the same conditions, and will damage catalysts due to raw fuel being dumped into the exhaust from the non-firing cylinders.
but i didn't replace the ignition coil , how to tell if one of them is bad ?
he told me it will cost around 2000 USD to fix the transmission
05-23-17, 02:03 AM
#24
Pole Position
If it's a catalyst damaging misfire your check engine light should blink, it does that to warn you that you're destroying your cats. Then again it sounds like that already happened. Any misfire codes should point you in the right direction (tell you which cylinder is misfiring). And you mentioned you cleaned your cats, I'm not aware of anything that will clean a catalytic converter and fix the problem...once they are melted or coated with something they usually are done. But you say you have a O2 sensor code, perhaps the cat didn't get cooked, but only the heating element in the sensor did? Doubtful after watching the video of you driving, lol, I can't see how anything could survive a serious misfire at those engine rpm's. Then again the car seemed to be running pretty smooth (maybe it's not a misfire). And I think the tach jumping around towards the end of the rpm range is most likely a rev limiter. You seem to have multiple issues with the car based on the amount of lights on in that dash, I'd take it to someone who can properly pull codes, read them, and diagnose problems.
05-23-17, 04:26 AM
#25
Driver School Candidate
Thread Starter
If it's a catalyst damaging misfire your check engine light should blink, it does that to warn you that you're destroying your cats. Then again it sounds like that already happened. Any misfire codes should point you in the right direction (tell you which cylinder is misfiring). And you mentioned you cleaned your cats, I'm not aware of anything that will clean a catalytic converter and fix the problem...once they are melted or coated with something they usually are done. But you say you have a O2 sensor code, perhaps the cat didn't get cooked, but only the heating element in the sensor did? Doubtful after watching the video of you driving, lol, I can't see how anything could survive a serious misfire at those engine rpm's. Then again the car seemed to be running pretty smooth (maybe it's not a misfire). And I think the tach jumping around towards the end of the rpm range is most likely a rev limiter. You seem to have multiple issues with the car based on the amount of lights on in that dash, I'd take it to someone who can properly pull codes, read them, and diagnose problems.
Hello Doublebase
there is no codes except the O2 sensor, and the ignition coil are working fine, do you think it is some issue with the ecu ?
05-23-17, 01:21 PM
#27
Driver School Candidate
Thread Starter
05-23-17, 01:42 PM
#28
Former Sponsor
Assuming the catalysts remain removed, my post above (#17) stands because since your computer is not receiving the expected signal from correctly operating catalysts, your car may be in some sort of a limp mode. And the limp mode is causing this issue. From what I remember from the video, it seems to hit an rpm and hold there, it won't shift. Well, maybe you're doing something that the factory would have never expected.
Of course Lexus expects that catalysts will eventually fail. So, they create some sort of limp mode to put the vehicle in, to prevent further problems (of which I cannot imagine) when a catalyst fails. I think it's possible since your catalysts are missing, your ECU computes that as a failure. In 99.9% of the cases, most owners would fix the problem (the failed catalyst), and NOT be trying to run their car up to redline. I'm not saying you're doing anything wrong or bad, more power to you. I find it interesting. But, Lexus engineers may have programmed in some sort of limp mode, and it will shift gears just fine ... except with 100% throttle, the shift point may be programmed to be at or near redline. However, if you are indeed in some kind of limp mode, its possible that the limp mode program prevents the vehicle from hitting redline. And since the Lexus engineers may not have imagined they would have a customer with a catalyst "failure", paired with a driver throttling it at 100% to redline, maybe the 2 conditions are fighting against each other.
Hard to explain. On one hand, the shift program may not be affected by limp mode, and is still waiting on redline to shift to the next gear because the throttle pedal is at 100%. On the second hand, the limp mode (if it exists) is preventing the vehicle from hitting redline. Thus, the problem you're experiencing.
Jason Oliver
Of course Lexus expects that catalysts will eventually fail. So, they create some sort of limp mode to put the vehicle in, to prevent further problems (of which I cannot imagine) when a catalyst fails. I think it's possible since your catalysts are missing, your ECU computes that as a failure. In 99.9% of the cases, most owners would fix the problem (the failed catalyst), and NOT be trying to run their car up to redline. I'm not saying you're doing anything wrong or bad, more power to you. I find it interesting. But, Lexus engineers may have programmed in some sort of limp mode, and it will shift gears just fine ... except with 100% throttle, the shift point may be programmed to be at or near redline. However, if you are indeed in some kind of limp mode, its possible that the limp mode program prevents the vehicle from hitting redline. And since the Lexus engineers may not have imagined they would have a customer with a catalyst "failure", paired with a driver throttling it at 100% to redline, maybe the 2 conditions are fighting against each other.
Hard to explain. On one hand, the shift program may not be affected by limp mode, and is still waiting on redline to shift to the next gear because the throttle pedal is at 100%. On the second hand, the limp mode (if it exists) is preventing the vehicle from hitting redline. Thus, the problem you're experiencing.
Jason Oliver
05-23-17, 04:44 PM
#29
Pole Position
Assuming the catalysts remain removed, my post above (#17) stands because since your computer is not receiving the expected signal from correctly operating catalysts, your car may be in some sort of a limp mode. And the limp mode is causing this issue. From what I remember from the video, it seems to hit an rpm and hold there, it won't shift. Well, maybe you're doing something that the factory would have never expected.
Of course Lexus expects that catalysts will eventually fail. So, they create some sort of limp mode to put the vehicle in, to prevent further problems (of which I cannot imagine) when a catalyst fails. I think it's possible since your catalysts are missing, your ECU computes that as a failure. In 99.9% of the cases, most owners would fix the problem (the failed catalyst), and NOT be trying to run their car up to redline. I'm not saying you're doing anything wrong or bad, more power to you. I find it interesting. But, Lexus engineers may have programmed in some sort of limp mode, and it will shift gears just fine ... except with 100% throttle, the shift point may be programmed to be at or near redline. However, if you are indeed in some kind of limp mode, its possible that the limp mode program prevents the vehicle from hitting redline. And since the Lexus engineers may not have imagined they would have a customer with a catalyst "failure", paired with a driver throttling it at 100% to redline, maybe the 2 conditions are fighting against each other.
Hard to explain. On one hand, the shift program may not be affected by limp mode, and is still waiting on redline to shift to the next gear because the throttle pedal is at 100%. On the second hand, the limp mode (if it exists) is preventing the vehicle from hitting redline. Thus, the problem you're experiencing.
Jason Oliver
Of course Lexus expects that catalysts will eventually fail. So, they create some sort of limp mode to put the vehicle in, to prevent further problems (of which I cannot imagine) when a catalyst fails. I think it's possible since your catalysts are missing, your ECU computes that as a failure. In 99.9% of the cases, most owners would fix the problem (the failed catalyst), and NOT be trying to run their car up to redline. I'm not saying you're doing anything wrong or bad, more power to you. I find it interesting. But, Lexus engineers may have programmed in some sort of limp mode, and it will shift gears just fine ... except with 100% throttle, the shift point may be programmed to be at or near redline. However, if you are indeed in some kind of limp mode, its possible that the limp mode program prevents the vehicle from hitting redline. And since the Lexus engineers may not have imagined they would have a customer with a catalyst "failure", paired with a driver throttling it at 100% to redline, maybe the 2 conditions are fighting against each other.
Hard to explain. On one hand, the shift program may not be affected by limp mode, and is still waiting on redline to shift to the next gear because the throttle pedal is at 100%. On the second hand, the limp mode (if it exists) is preventing the vehicle from hitting redline. Thus, the problem you're experiencing.
Jason Oliver
05-23-17, 04:52 PM
#30
Pole Position
I'd take it to someone who can simply hook it up to a scanner, pull the code, walk over to their software program that they have, punch the code in...and see what it says to trouble shoot first. You have no cats, so fuel/fire is going to come out of your tailpipe (the cat would stop that). Maybe you have a leaking injector? Maybe the O2 sensor is telling the computer you're running lean and it's dumping fuel to correct it? Maybe you've had exhaust work and it's leaking oxygen and throwing the O2 sensor off? Who knows? Get it checked out.