So.....I have my Indian Princess Dakota with 103,585 miles and she has high NOx. @ 15mph. 999ppm is the max allowed here in CA and I had 1175ppm on my first SMOG test and 1086ppm on my second test. i replaced my PCV valve and Seafoamed the throttle body between 1st and 2nd test. After my second test I have replaced my thermostat and coolant. I know high NOx are caused by high cylinder temperatures (↑2370 f) and that often the EGR system is the cause. However as you know my 96 does not have an EGR valve. I have tested the vacuum on my PCV system and that is fine.. I have no MIL codes set. I did purchased a Blue Driver code reader and I have the following failure codes on my Mode 6 test.

TID :13 CID:01 = Min - Max 0x30 Val: OxSF ,

TID:19 CID:01 = Min OxDSE Max - Val: OxSBC,

TID:1A CID:01 = Min Ox1AA1 Max- Val: Ox868

TID: 21 CID:01 = Min: Ox10c Max: - Val: 0x00

TID: 52 CID:01 = Min: Ox1403 Max:- Val: Ox03

TID: 53 CID:01 = Min: Ox80 Max - Val: Ox00


I've tried to search for these codes but cannot find anything specific to them. Does anyone know what any of these codes are?


Thanks

 

Hi,

Unfortunately, I do not have much knowledge on the codes you have listed above, however, I'd check the following items.

1. High cylinder temperatures are often caused by an overly lean fuel mixture. In this case, I'd check for a bad oxygen sensor. When oxygen sensors go bad, they can, similar to your case, cause the fuel/air ratio to become lean, or, in the case of my '88, run rich due to the truck to entering limp mode.
2. Check your catalytic converter. Without EGR to burn remaining hydrocarbons, the catalytic converter is tasked with compensating for EGR. I'd also suggest searching for exhaust leaks as leaks can result in increased NOx emissions.
3. I'm not sure if 1996 trucks were equipped with smog pumps, but if so, I'd recommend checking it. The smog pump is located on the front driver side of the engine above the power steering reservoir.

Hope this helps, best of luck!

 

Thanks for the suggestions. I have replaced the upstream O2 sensor about 10k miles ago along with plugs wires dist cap. . The SMOG check feature says the O2's are good.. On my reader the short & long term fuel trims are +- 3 - 4%. The SMOG pump is putting out air so I think it's okay. Since the high NOx can be created by high cylinder combustion temperatures via lean condition not sure where to check for exhaust leaks. I did replace the PCV hose to the manifold on a just in case basis while checking for vacuum leaks. As a temporary fix I read an interesting article by a PHD group on the use of Acetone @ 3 - 10% ratio to reduce emissions so I might try that.but I think the answer might be in these failed TID & CID codes that I can't find any info on. I'll just soldier on and hope I bump into a Mopar tech here or somewhere. Thanks again.

 

I have never seen any info on those codes....... I wouldn't even know where to begin to look. Quick search reveals that mode $06 data was never meant for techs to see...... though it does provide useful data. I haven't come up with charts about just what the various code mean though...

What brand O2 sensors did you install when you changed them?

 

Have you tried testing the coolant temperature sensor?