Returning after a few years... need help passing emissions....

[fattom]

Well unless you are talking about a high school dance I have no idea what you are saying.... lol

 

[wheels87k5]

The PROM is the chip that's inside the ECM. It can be programmed to do things like edit out the EGR, adjust fuel tables, etc.

If you removed the EGR and blocked the opening, or just unplugged it, and drove the truck you'd get a SES light telling you there is a problem. After checking for the code it would tell you something is wrong with the EGR. So you could edit out the EGR so you wouldn't get a code/SES light.

If your chip has the EGR deleted then it won't allow it to work so your NOx readings are going to be high.

 

[fattom]

Ah. That makes slot of sense now... Still the question of can I pick that up at a local parts store or am I going to be searching around for it? And would I need to get it tuned?

 

[dyeager535]

Ah. That makes slot of sense now... Still the question of can I pick that up at a local parts store or am I going to be searching around for it? And would I need to get it tuned?

IMO your best bet is finding the proper ECM for your truck, and just swap the whole thing out. I don't know what the market THINKS those ECM's are worth (used), but with a stock chip I'd say $50 or less.

In the past it's seemed harder and more costly to find just the PROM than the entire ECM with PROM.

 

[frankin5]

http://www.car-part.com/ go on this site with you four letter code off of your ECU (engine control module). You can search Calif or west coast, all of the USA to find what you need.
this is just a guide as to what you are looking for
D#1227747 (ARJU) Ele Cntrl Mod, 8-350 (5.7L), ID 1227747

 

[fattom]

Update**** got it taken care of. After the cats I had a buddy look and we figured out timing was way off. Reset timing and passed. Thanks for all the help guys!