Magnaflow Cat. FAILED EMMISSIONS ,
#81
08-06-2012, 08:24 PM
I know in my state, they scan the onboard computer of '96 and newer cars. Older cars get basically put on a dyno to do a tail pipe test. If you come in and your car is not in a "ready state" on a '96 or newer, they will test it the old way on the rollers. NOW, if you come in, FAIL to test by scanning the computer then the ONLY way to pass is by the computer.
But this is the system in my location (and it's not even state wide).
I know "some people" who have maye, maybe not, cleared the computer and readiness data, went to get checked, was told it's not ready, had it put on the rollers and passed.
Unfortunately, I am really drawing a blank on the EGR issue. The odd part is, I believe this began AFTER you did the non-fouler trick for the downstream O2. This may sound silly, but when looking for a cause of the problem, can you check that the non-foulers on the O2 are tight?? THat there is not a hole or leak from them? Not sure if it will mean anything, but it's just a curiousity.
Otherwise, I am stumped. I'm also further stumped that this is not a code in the shop book!!
But this is the system in my location (and it's not even state wide).
I know "some people" who have maye, maybe not, cleared the computer and readiness data, went to get checked, was told it's not ready, had it put on the rollers and passed.
Unfortunately, I am really drawing a blank on the EGR issue. The odd part is, I believe this began AFTER you did the non-fouler trick for the downstream O2. This may sound silly, but when looking for a cause of the problem, can you check that the non-foulers on the O2 are tight?? THat there is not a hole or leak from them? Not sure if it will mean anything, but it's just a curiousity.
Otherwise, I am stumped. I'm also further stumped that this is not a code in the shop book!!
I have the GM shop manuals as well... The real thick ones, and as you stated, the code P0492 is NOT listed in them at all, not even in the back of the manual.. That's what has me puzzled so much... I will check out the Anti Foul to make sure that there is not a leak also.. Quick question.. Some people on the net are using 2 anti foul and some people use 1, currently I have 2 of them on, do you think I should try just one? May be worth a shot... Matter of fact, I'm gonna do that for my next step... Thanks for the info and possibly a "cure". I'll b back !..lol...
#82
08-08-2012, 12:13 AM
Good news, in a way... The infamous P0402 code is GONE .... YEA. !!!!!! I have no idea what part of what I did that cleared it.. After all I did the code finally went away... BUT ! Now I am Back to the P0420 code... I am currently trying to address this by using a used cat n downpipe if i can find one... Im hopeing this will be the end of my quest for the Emissins testing... I'll be back soon... Thanks again to EVERYONE that has helped me thru this... Very much appreciated... Mjclemm...
#83
08-08-2012, 06:09 AM
Join Date: Apr 2010
Location: Mentor, Ohio
Posts: 12,225
Last thing you did was remove one of the non-foulers. Question, I recall reading at one point you bored both of the non-foulers out??
If so, what I read in the past is only one needs bored out for the O2 probe and the other stays the way it is, just to space the O2 from the exhaust stream.
Perhaps the downstream O2 plays into both codes??? Just a guess and another guess is perhaps it has to do with both the non-foulers being bored out. Perhaps using one bored and the other untouched will yield the desired results???
Again, I'm purely guessing and have NOTHING to back that guess with.
If so, what I read in the past is only one needs bored out for the O2 probe and the other stays the way it is, just to space the O2 from the exhaust stream.
Perhaps the downstream O2 plays into both codes??? Just a guess and another guess is perhaps it has to do with both the non-foulers being bored out. Perhaps using one bored and the other untouched will yield the desired results???
Again, I'm purely guessing and have NOTHING to back that guess with.
#84
08-09-2012, 12:58 AM
Last thing you did was remove one of the non-foulers. Question, I recall reading at one point you bored both of the non-foulers out??
If so, what I read in the past is only one needs bored out for the O2 probe and the other stays the way it is, just to space the O2 from the exhaust stream.
Perhaps the downstream O2 plays into both codes??? Just a guess and another guess is perhaps it has to do with both the non-foulers being bored out. Perhaps using one bored and the other untouched will yield the desired results???
Again, I'm purely guessing and have NOTHING to back that guess with.
If so, what I read in the past is only one needs bored out for the O2 probe and the other stays the way it is, just to space the O2 from the exhaust stream.
Perhaps the downstream O2 plays into both codes??? Just a guess and another guess is perhaps it has to do with both the non-foulers being bored out. Perhaps using one bored and the other untouched will yield the desired results???
Again, I'm purely guessing and have NOTHING to back that guess with.
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