Failed Smog - Again
#1
Failed Smog - Again
1994 Jaguar XJS 120k
I failed smog a couple years ago (high NO) and replaced the EGR valve, air filter, plugs, wires, rotor... it did not pass until I replaced the rear cat.
Fast forward to now, after 6k miles and I failed again. Here are the results:
............co2....o2.......................hc.......................co.........no(pass)
15mph 14.8.... 0 .........80 (max) -88 .......32(max) -.38 .... .. 477 -78
25mph 14.7.... 0 .........45(max) -97 ........30(max) -.56 .... ..481 -174
I failed HC and CO on both 15mpg and 25mph. Its not too far off. Do I need to replace my precats? Will changing the oil help? Air filter looks very clean. I have a new IACV, new fuel pump, new EGR... I really do not want to change everything out again unless necessary. Has anyone else been through this in CA?
I failed smog a couple years ago (high NO) and replaced the EGR valve, air filter, plugs, wires, rotor... it did not pass until I replaced the rear cat.
Fast forward to now, after 6k miles and I failed again. Here are the results:
............co2....o2.......................hc.......................co.........no(pass)
15mph 14.8.... 0 .........80 (max) -88 .......32(max) -.38 .... .. 477 -78
25mph 14.7.... 0 .........45(max) -97 ........30(max) -.56 .... ..481 -174
I failed HC and CO on both 15mpg and 25mph. Its not too far off. Do I need to replace my precats? Will changing the oil help? Air filter looks very clean. I have a new IACV, new fuel pump, new EGR... I really do not want to change everything out again unless necessary. Has anyone else been through this in CA?
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1994 Jaguar XJS 120k
I failed smog a couple years ago (high NO) and replaced the EGR valve, air filter, plugs, wires, rotor... it did not pass until I replaced the rear cat.
Fast forward to now, after 6k miles and I failed again. Here are the results:
............co2....o2.......................hc.......................co.........no(pass)
15mph 14.8.... 0 .........80 (max) -88 .......32(max) -.38 .... .. 477 -78
25mph 14.7.... 0 .........45(max) -97 ........30(max) -.56 .... ..481 -174
I failed HC and CO on both 15mpg and 25mph. Its not too far off. Do I need to replace my precats? Will changing the oil help? Air filter looks very clean. I have a new IACV, new fuel pump, new EGR... I really do not want to change everything out again unless necessary. Has anyone else been through this in CA?
I failed smog a couple years ago (high NO) and replaced the EGR valve, air filter, plugs, wires, rotor... it did not pass until I replaced the rear cat.
Fast forward to now, after 6k miles and I failed again. Here are the results:
............co2....o2.......................hc.......................co.........no(pass)
15mph 14.8.... 0 .........80 (max) -88 .......32(max) -.38 .... .. 477 -78
25mph 14.7.... 0 .........45(max) -97 ........30(max) -.56 .... ..481 -174
I failed HC and CO on both 15mpg and 25mph. Its not too far off. Do I need to replace my precats? Will changing the oil help? Air filter looks very clean. I have a new IACV, new fuel pump, new EGR... I really do not want to change everything out again unless necessary. Has anyone else been through this in CA?
Last edited by Gippsland; 01-08-2015 at 11:20 PM.
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Gippsland (01-09-2015)
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The standards for emissions was set for the fuel at the time. Now you have me thinking!
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Well, Henry ford never went to the greater Los Angeles basin. The early Spanish explorers named it "La Bahia de Los Fuegos" translated to "Bay of Smokes"!!
and, the advent of the populace, freeways and that stuff exacerbated it horribly.
No winds to scour the basin. And a temperature inversion kept the junk down, rather than allowing it to float upwards.
We are having bad air days as dictated by a local bureuracracy. No wood burning in the fire place unless it is the only heat source. Smoke police can cite one for a violation.
I don't think t is the fuel formula. Lots of commonality even if done by different refineries. Tis the additives that are different amongst brands.
Way back when Ethyl was banned. Cars got fillers that only allowed non leaded fuels.
lead will cook a cat, wham bang. Rich or misfiring cylinders will kill a cat. don't ask.
But, although cats live long lives, it is a finite life.
And, now, zinc is suspect and modern oils have less of it if any at all. OK, in most modern engines, but not so much in older engines. The issue is valve lifter designs.
Flat tappet vs roller tappets.
And, it is almost if not so, that the cats be good and hot at test time. My local shop preaches it. I usually take a good freeway run sans OD to get them good and hot, then into the SMOG shop. So far, so good.
Carl
and, the advent of the populace, freeways and that stuff exacerbated it horribly.
No winds to scour the basin. And a temperature inversion kept the junk down, rather than allowing it to float upwards.
We are having bad air days as dictated by a local bureuracracy. No wood burning in the fire place unless it is the only heat source. Smoke police can cite one for a violation.
I don't think t is the fuel formula. Lots of commonality even if done by different refineries. Tis the additives that are different amongst brands.
Way back when Ethyl was banned. Cars got fillers that only allowed non leaded fuels.
lead will cook a cat, wham bang. Rich or misfiring cylinders will kill a cat. don't ask.
But, although cats live long lives, it is a finite life.
And, now, zinc is suspect and modern oils have less of it if any at all. OK, in most modern engines, but not so much in older engines. The issue is valve lifter designs.
Flat tappet vs roller tappets.
And, it is almost if not so, that the cats be good and hot at test time. My local shop preaches it. I usually take a good freeway run sans OD to get them good and hot, then into the SMOG shop. So far, so good.
Carl
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