Inspection ? (won't pass)
10-28-2011, 03:06 PM
#21
Join Date: Jun 2009
Location: Maryland
Posts: 12
Returned the car to stock tune, drove for about 300 miles (or complete drive cycle). Check engine light came on stating "Catalyst exceeding threshold" or something along those lines. I cleared the code and drove the car another 50 miles and the car passed inspection.
Thanks.
10-28-2011, 04:13 PM
#22
Banned
Join Date: Aug 2006
Location: sc
Posts: 457
I have Bama Performance tune (hot rod cams, LT headers, and catted pipe), car is not triggering any codes; but inspection place says the O2 sensors are not reading the correct numbers and shows Open Loop at idle (should be closed loop). They won't pass the car. Anyone else had this problem?
10-30-2011, 12:15 AM
#23
5th Gear Member
Join Date: May 2007
Location: Central Texas
Posts: 2,388
I have the same problem and very similar set up to yours (Pypes LT headers, X-pipe w/Pypes HFCs, o2 sensor risers, Borla Stingers, Detroit Rocker cams, Paxton SC). You simply returned the tune to stock and drove for 300 miles or so? Any drivability issues during those 300 miles?
Thanks.
Thanks.
If you're getting P0420 and/or P0430 codes, do a search on using spark plug fouler spacers on the rear 02 sensors; those spacers move the o2 sensors more out of the exhaust stream and reduce the 'counts' made to trigger the dtcs. This has worked for numerous people, some have had to use 2 spacers on 1 o2 sensor to get the counts low enough. This only applied to the rear o2 sensors and to p0420/0430 codes.
11-01-2011, 06:28 PM
#24
Join Date: Jun 2009
Location: Maryland
Posts: 12
using a stock tune with that setup won't help you in most situations.
If you're getting P0420 and/or P0430 codes, do a search on using spark plug fouler spacers on the rear 02 sensors; those spacers move the o2 sensors more out of the exhaust stream and reduce the 'counts' made to trigger the dtcs. This has worked for numerous people, some have had to use 2 spacers on 1 o2 sensor to get the counts low enough. This only applied to the rear o2 sensors and to p0420/0430 codes.
If you're getting P0420 and/or P0430 codes, do a search on using spark plug fouler spacers on the rear 02 sensors; those spacers move the o2 sensors more out of the exhaust stream and reduce the 'counts' made to trigger the dtcs. This has worked for numerous people, some have had to use 2 spacers on 1 o2 sensor to get the counts low enough. This only applied to the rear o2 sensors and to p0420/0430 codes.
I'm really getting frustrated.
Do you think putting the stock cats back on would help?
Thanks again.
11-02-2011, 02:50 AM
#25
5th Gear Member
Join Date: May 2007
Location: Central Texas
Posts: 2,388
Yup; high-slows tend to do that.
There's a minor rear o2 circuit modification you can do as well, to attenuate the signals and reduce the counts the PCM is making ( http://www.paladinmicro.com/pmicro.p...Eliminator.htm ). I was going to try this, but no longer have the issue right now, as my tune is taking care of it
There's a minor rear o2 circuit modification you can do as well, to attenuate the signals and reduce the counts the PCM is making ( http://www.paladinmicro.com/pmicro.p...Eliminator.htm ). I was going to try this, but no longer have the issue right now, as my tune is taking care of it
11-03-2011, 11:12 AM
#26
Join Date: Jun 2009
Location: Maryland
Posts: 12
Yup; high-slows tend to do that.
There's a minor rear o2 circuit modification you can do as well, to attenuate the signals and reduce the counts the PCM is making ( http://www.paladinmicro.com/pmicro.p...Eliminator.htm ). I was going to try this, but no longer have the issue right now, as my tune is taking care of it
There's a minor rear o2 circuit modification you can do as well, to attenuate the signals and reduce the counts the PCM is making ( http://www.paladinmicro.com/pmicro.p...Eliminator.htm ). I was going to try this, but no longer have the issue right now, as my tune is taking care of it
http://bigdaddiesgarage.com/mini-cat-cel-fix.html
11-06-2011, 07:53 PM
#27
Your tune probably runs in Open loop for 60 to 90 seconds on startup to heat up the O2 sensors longer before going into Closed loop because of the long tube headers.
The shop could have just waited a couple minutes at idle.
I wonder how your car ran well enough to drive it 300 miles with the long tube headers and the O2 sensors being so far down the exhaust. I would think it would have run rich.
The shop could have just waited a couple minutes at idle.
I wonder how your car ran well enough to drive it 300 miles with the long tube headers and the O2 sensors being so far down the exhaust. I would think it would have run rich.
11-17-2011, 01:37 AM
#28
5th Gear Member
Join Date: May 2005
Location: S.burbs Chicago
Posts: 4,793
I put my cats back on, air box, stock tune, drove 40 miles to test facility by work, all monitors were ready, go figure. doesn't always take numerous drive cycles.
Otherwise, with mods, including tune, rear o2 monitors are off. Giving a few not ready results. Evap and something else, (cant remember what) will not run until it gets a reading from those rear o2's that are turned off.
Otherwise, with mods, including tune, rear o2 monitors are off. Giving a few not ready results. Evap and something else, (cant remember what) will not run until it gets a reading from those rear o2's that are turned off.
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