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  #161  
Old 09-29-2011, 09:46 PM
ToddD ToddD is offline
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Paul... you don't happen to still have those O2 sensors sitting around, do ya?

I'm trying to pass emissions and have failed twice.
http://forum.ih8mud.com/80-series-te...ions-test.html
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  #162  
Old 04-10-2012, 03:15 PM
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My catalytic converter temperatures (1993) were 430 +/- 10 inlet and 530 +/- 10 outlet. I had just come off 15 minutes on I-70. 65 degree day, three blocks of local driving, shut it off for three or four minutes and then turned it back on and tested while idling, with AC on for some extra RPMs.

A Yahoo page said 100 degree rise is good. This in-depth paper says 200 - http://www.bearriverconverters.com/data/CatOpp.pdf This, from Toyota, wants 550 minimum for efficiency operation, with 750 as ideal - http://www.autoshop101.com/forms/h64.pdf Another interesting read - http://www.catalyticconverter.org/ne...rter-&News=216

New O2 Sensors are on their way and I will retest emissions after that.

For future readers this is on a 1993 FZJ80 with a freshly rebuilt (all but the bottom end) engine. All readings but NOx are great. EGR system has been tested. VSV has been tested. Cats and O2 sensors came off a 170,000 mile 1994 truck.
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  #163  
Old 04-10-2012, 05:06 PM
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those are the numbers I was getting on my 60 with 70k mile cats behind the v8. 450 or so to 550 or so...

I think they were working OKm but the folks at the emissions place convinced me to put new ones on. they were only 40 bucks each for me so I went for it. not suggesting the same for you.
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  #164  
Old 04-10-2012, 07:39 PM
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Quote:
Originally Posted by rover67 View Post
those are the numbers I was getting on my 60 with 70k mile cats behind the v8. 450 or so to 550 or so...

I think they were working OKm but the folks at the emissions place convinced me to put new ones on. they were only 40 bucks each for me so I went for it. not suggesting the same for you.
Cool to hear. Did your new cats do the trick?

I can get the Bosal cats for about $120 each and that will be what I do if the O2 sensors alone don't fix me.
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  #165  
Old 04-10-2012, 09:33 PM
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Dan, did I hear something at the meeting about your cats being in parallel and not in series?
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  #166  
Old 04-11-2012, 12:14 AM
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Quote:
Originally Posted by subzali View Post
Dan, did I hear something at the meeting about your cats being in parallel and not in series?
Yes they are. The exhaust merges after the cats. Both O2 sensors are in front.
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  #167  
Old 04-16-2012, 08:47 PM
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Passed Emissions!!

__________Test 1____Test 2_______Test 3
HC_______0.346______0.1889______0.3118
CO_______3.984______4.000_______9.649
CO2______867.6______706.0_______766.5
Nox______9.354______9.256_______3.024

Test 1: no special prep, short wait, idled at 2,000RPM
Test 2: tank premium, two cans red HEET, tires at 50PSI, well warmed up, short wait, idled at 2,000RPM
Test 3: NEW O2 Sensors, tank premium, tires at 50PSI, no HEET, 15 minute wait, idled at 3,000RPM

Tires were 285/75R16 Nitto Terra Graplers.

So, HEET brings down HC and CO2, seems to not affect CO or NOx, and bad O2 sensors affect NOx. As noted before, catalytic converters measured a 100 degree temperature rise so between that and this test they seem to be working fine.

Since I could not find it posted anywhere (here or MUD) ill searchably write bad O2 sensors cause high NOx readings. Lower NOx by getting new O2 sensors. I used Toyota OEM oxygen sensors.

Than you again Robbie for suggesting I test after replacing the O2 sensors and before changing catalytic converters. Heated 4-wire O2 Sensors as we have in our cruisers should have a 60,000 - 100,000 mile life.
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  #168  
Old 05-13-2012, 03:24 PM
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crap...that time again.
anyone passed with massive amounts of leaks? i've got at least three exhaust leaks before you even hit the second cat at the muffler
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  #169  
Old 05-13-2012, 05:35 PM
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I'm going to start putting a reminder on my calendar to drive past the emission stations a month before hand so I don't need to go in.

I have 2 good cats you can weld in if needed.
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  #170  
Old 05-13-2012, 06:05 PM
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thanks wes, but cats arent' the problem (at least i don't think so ). i've got one blow throw on the pipe where the front o2 sensor is and a couple leaks on the flex that i put in when i had to jerry rig a second cat last time. stupid emissions
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