Failed Inspection.....???
09-04-11, 05:13 AM
#17
Lexus Champion
If he had an error code he would have failed for that, a system not ready is completely different.I live in Fl so we don't worry about inspections and I'm no expert in this but just trying to take a pick at this.
Could be like you said the 02 sim is prob acting up or the scan program they are using just doesn't like the 02 sim
09-04-11, 07:20 AM
#18
Sorry for trying to help, but getting your car scanned takes a coupe of minutes and will def rule out if he has an error code thrown.
I live in Fl so we don't worry about inspections and I'm no expert in this but just trying to take a pick at this.
Could be like you said the 02 sim is prob acting up or the scan program they are using just doesn't like the 02 sim
I live in Fl so we don't worry about inspections and I'm no expert in this but just trying to take a pick at this.
Could be like you said the 02 sim is prob acting up or the scan program they are using just doesn't like the 02 sim
09-04-11, 09:19 AM
#19
Tech Info Resource
iTrader: (2)
Texas has the same emissions testing that PA does Mitch, when you upload it I will take a look and let you know what/if anything can be done. As I have stated in the past these o2 sims are NOT a good thing first off, the monitors on the F are VERY critical as to what they want to see before they pass the self test. That said passing and tripping a code are two different things. If these monitors are not setting this could explain some other peoples problems with failed Random Tech cats. anyways post up the report when ya get a chance.
I think Ming is onto something with the Randomtech cat failures. The ECM may be running this rich test and since it sees no response from the secondary O2, it runs rich waiting for a response longer than it should and overheats the cats. Apparently, the simulator is good enough to keep from setting a DTC, but not good enough to prevent catalyst failure.
From the Factory Service Manual:
The ECM uses sensors mounted in front of and behind the three way catalytic converter to monitor its efficiency.
The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.
In order to detect any deterioration in the three way catalytic converter, the ECM calculates the oxygen storage capacity of the three way catalytic converter. This calculation is based on the voltage output of the heated oxygen sensor while performing active air fuel ratio control, rather than the conventional detecting method, which uses the locus ratio.
The oxygen storage capacity value is an indication of the oxygen storage capacity of the three way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 15 to 20 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If a rich-lean cycle of the heated oxygen sensor is long, the oxygen storage capacity becomes greater. There is a direct correlation between the oxygen storage capacities of the heated oxygen sensor and the three way catalytic converter.
The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.
In order to detect any deterioration in the three way catalytic converter, the ECM calculates the oxygen storage capacity of the three way catalytic converter. This calculation is based on the voltage output of the heated oxygen sensor while performing active air fuel ratio control, rather than the conventional detecting method, which uses the locus ratio.
The oxygen storage capacity value is an indication of the oxygen storage capacity of the three way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 15 to 20 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If a rich-lean cycle of the heated oxygen sensor is long, the oxygen storage capacity becomes greater. There is a direct correlation between the oxygen storage capacities of the heated oxygen sensor and the three way catalytic converter.
09-04-11, 09:36 AM
#20
I read quite a bit on what the secondary O2 sensors do and some of the testing the ECM does routinely. I really doubt you'd ever get a test ready indication with any of the simulators because they just falsely report everything is OK. The ECM has a test cycle it performs routinely to check the secondary O2 sensors (they didn't used to do this at all) where it richens or leans the fuel mixture briefly and looks for the proper response from the secondary O2 sensors.
I think Ming is onto something with the Randomtech cat failures. The ECM may be running this rich test and since it sees no response from the secondary O2, it runs rich waiting for a response longer than it should and overheats the cats. Apparently, the simulator is good enough to keep from setting a DTC, but not good enough to prevent catalyst failure.
From the Factory Service Manual:
Also. this isn't something you'll see on a dyno test or tune without running at steady state for a considerable time, so "tuning" around this is going to be very challenging and likely expensive.
I think Ming is onto something with the Randomtech cat failures. The ECM may be running this rich test and since it sees no response from the secondary O2, it runs rich waiting for a response longer than it should and overheats the cats. Apparently, the simulator is good enough to keep from setting a DTC, but not good enough to prevent catalyst failure.
From the Factory Service Manual:
Also. this isn't something you'll see on a dyno test or tune without running at steady state for a considerable time, so "tuning" around this is going to be very challenging and likely expensive.
09-06-11, 07:15 AM
#23
If the microprossore turn out to be the problem, give Sikky a call ASAP at (410) 780-0009. There have been reports of a handfull or so microprossors with issues and it sounds like you may have one. They do warranty them so it's just a matter of calling and explaining what's going on.
Last edited by caymandive; 09-06-11 at 07:48 AM.
09-06-11, 08:12 AM
#27
Lead Lap
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lol Thanks man! It just pisses me off I could get a 700hp honda to pass, but this ISF is being an issue. Ill calm down once I get a sticker haha. It was just one more mark against the F along with the aftermarket let down :-(
for ming