Why not just fix it?

 

I'm in the process now, but I need to get emission test in order to register it. Also would rather not have to deal with it as it's just a winter beater truck

Sent from my SM-G973U using Tapatalk

 

Turning the light off or disabling the sensor/s won't let it pass emissions.

 

It will if you disable the code by reprogramming the PCM. All they do is plug into the OBDII port to see if any codes are active here. If you disable the code in PCM, it can never become active, passing emission test.

I've done it with Subaru's and BMW's in the past no problem. Computer software for Subaru's and BMW's are easily obtained online for free. I just can't find anything for GM's which is why I'm asking here.

Sent from my SM-G973U using Tapatalk

 

I'm pretty sure the emission programs "look" for certain parameters from sensors to be there. The PCM In your tuck is pretty primitive....still not sure you can do what you're looking for.

 

The only way you can disable the evap code is with a tuning programmer like HP Tuners.
Problem is it will cost you more to do that than it will to fix the problem which is either a leaky hose or a vent valve not closing.
What code are you getting?
There is a new open source tuning program (Ls Droid) but I'm pretty sure it's for 01-02 0411 PCM's or 03-04 P-59's. Don't think it'll work on a older "black box" PCM like the 96-00 has.

 

I am getting code P0442. I just replaced the gas cap as a first thing to try. Cleared the code with my scanner and am waiting for the EVAP readiness monitor to finish its cycle. That way I'll know if the CEL comes back on or not.

I will look into HP Tuners and LSDROID too.

Sent from my SM-G973U using Tapatalk

 

I was thinking of LS droid too, but you're right it's for the newer silver computers only.

 

Have you played with LS Droid at all. I went on their website to get some idea of how it was developing and got the impression it's written for IT guys who own an LS engine. There were discussions about how to do things that felt way over my head. Meant for folks who write code for a living or hobby.
HP Tuners appears to be meant for gear heads who need to deal with computers. They have have glossed over the finished products so that the average guy can turn something on and off w/o needing to know how to write software.
Or am I just that PC illiterate? I've built desktops and installed all the OS and drivers needed for it to work properly, but have no idea how that software is created.
I have the gut feeling that by the time they have it simplified enough for average Joe to use the computers it applies to will be too old for anyone to care. They're already 20 years old.

 

I haven't touched it, only know of it, but also have had somewhat of the same impression. But it is free, so hard to beat that.

 

P0442 is for a small evap leak. It can be as small as .0005. I have it on my Silverado and ignore it. Not worth my time to chase a leak so small that it has no affect on driveability or the environment.

 

Out of curiosity, do you by chance know how small of a leak can set a p0456 - EVAP very small leak? Would be interesting to know. Comparatively a p0442 would be like a tire blowing out and a p0456 would be a small pinhole leak in a tire. P0456 codes are near impossible to trace down

 

using HPT will allow the sensors to show a ready state and will not show a failure if you set the codes for not reported

 

This would be perfect if an HPT wasn't so expensive, lol

Sent from my SM-G973U using Tapatalk

 

I'm in Wisconsin and have never had to deal with inspections. You need to register it in a different county if you're in one of the 7 SE counties that have it. Don't you have any relatives who live outside the lakeshore area?

 

That I do not.

Sent from my SM-G973U using Tapatalk

 

I'll never understand why people take cats off. They don't hurt anything, and help the environment.

 

You will need the JET DST program to do anything with the black box pcm.

 

I thought HPT also covered them? Their applications list says they cover S10 4.3 98-04, so I guess only the 98-00 black boxes. Not the 96-97.

 

I can't remember if I tried on my truck or not , but I know the Jet does.

Sent from my SM-G975U using Tapatalk

 

Well may have gotten lucky. I replaced the gas cap as thats always the easiest thing to try. Erased the CEL with my scanner. Took almost 300 miles to get the EVAP readiness monitor to show OK. time to get the emissions test ASAP, lol.

Sent from my SM-G973U using Tapatalk