Hi Brian,
Before I installed a speed sensor, I'd get code 24s pretty frequently. If the CEL were to stay on, I'd get fuel cutout under WOT. But, generally, the CEL would be on for a little and then turn itself off, and would have no affect on driving if off. I installed a constant pulse "speed sensor" (tells the cars it's always going X mile per hour). No more code 24 for me.
My friend Bill had to replace his CAT to deal with high nox. From Wikipedia:
Most present-day vehicles that run on gasoline are fitted with a "three way" converter, so named because it converts the three main pollutants in automobile exhaust: an oxidising reaction converts carbon monoxide (CO) and unburned hydrocarbons (HC), and a reduction reaction converts oxides of nitrogen (NOx) to produce carbon dioxide (CO2), nitrogen (N2), and water (H2O).
His EJ22 burns lots of oil so I don't think his cats last very long.
good luck,
Tom
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--- In subaruvanagon@..., BRIAN MC*HUGH <bmchugh0946@...> wrote:
I read the code via the black connectors. I used a test light hooked up to the check light wire in the ecu. The check light on the dash was wired to the odo counter only. No codes via the green connectors and no codes when running. I'm going to try sea foam today and retest next week, hope it's not the CAT.
Brian
Sent from my iPhone
On Apr 1, 2012, at 12:52 PM, "iiigoiii" <iiigoiii@...> wrote:
just curious - how do you know that you have a stored code if your check light isn't lit? is it a temporary code that you found with the green connectors?
also, i hadn't heard of an early EJ22 ECU that is connected to a mileage counter? or am i brain farting on this one?
in my experience, high NOx CAN be caused by high combustion temps, but is more likely caused by (in order) a failing cat or elevated O2 in exhaust. the early EJ22s are able to pass smog without an EGR system.
could whatever blew out your previous cat have compromised this one also? i've been hearing rumors lately that there are/were some cats sold in recent years that don't last very long at all anyway....
--- In subaruvanagon@..., "Brian McHugh" <bmchugh0946@> wrote:
I got the ck light to clear, turned out to be the OSX counter on the spedo cable. Still have the stored code on the ecu but no active light. Still have to find the cause of the high NOX readings.
From: brianmchugh22
Sent: Saturday, March 31, 2012 3:54 PM
To: subaruvanagon@...
Subject: [subaruvanagon] CA Emmissions Fail Help
I have a 85 Vanagon with a 92 EJ22 manual transmission engine that has just failed emmissions in CA. The engine has around 200k on it. The readings are as follows.
15mph 1786rpm CO2 13.9 O2 .9 HC 66 CO .72 NO 1348
25mph 1639rpm CO2 13.9 O2 .9 HC 72 CO .69 NO 1432
It failed on the NO as the allowable was 1085 and 1120.
The ck eng. light is lit. I am getting code 24 with the black connectors connected. I did just clean the idle air valve as I had a poor idle and occasional stalling after comming off of load. Runs fine now. O2 sensor, plugs, and CAT were replaced after a problem that melted the orignal CAT and blew out the muffler a few months ago. Turned out to be a loose sensor wire that has been corrected. No running problems now.
Any ideas, bad CAT????
Thanks,
Brian
San Diego, CA
