New member, failed emissions high HC at idle.
 

Hey, thanks for viewing my thread. As i said before I am a new member using my brother's login, I bought his 1990 s10 blazer 4.3 a couple of months ago. In an attempt to get the title transfered into my name I failed emissions. The HC (PPM) idle limit is 220, I failed with a 580. The spark plugs were changed out for the proper AC Delco last summer, and just a few months back the catalytic converter was replaced due to it rattling. Any suggestions on this would be much appreciated!

NOTE; I am not the most mechanically inclined person in the world, but I am slowly learning.

-Elliot

Search for how to egr and do some reading in the threads. Go to Jiffy Lube or one of those places and get a fuel system cleaner. (Jiffy Lube around here guarentees theres).


Also, google your proplem and read what others have done to correct the problem.

This is James. Ive tested the actuation of EGR valve by pressing it w/ a long screw driver at idle and it'd stumble pretty heavily. I've removed it once and cleaned it like 7yrs ago or s when it was still Elliots truck while i was having the engine swapped in my 740iL. I cleaned it back then because it has a terrible stumbling issue and was referred to clean the EGR, but in the end it turned out to be a slowly failing fuel pump. Before I gave the truck back to him, i was averaging 16-18mpg, even towing a trailer. He's averaging 12mpg, so clearly something failed recently.