So I have the Colorado "Collector Vehicle" plates which means I only have to do emissions every 5 years. At the same time, I don't want to redo everything just for emissions every 5 years. Thinking I need to leave the smog pump system, O2 sensor, and cats alone for now. Wondering though if I can just slap a "racing" lower intake manifold gasket in to block the flow of exhaust to the EGR so I can quit dumping the nasty stuff into the intake. Any thoughts from those of you more intimate with the '86 EFI setup than I am? They don't check EGR function during the test. They just make sure all equipment is installed and that it passes the numbers.
1986 F-150 SC 2wd 4spd 302EFI Base Model all OEM motor/trans/emissions equipment.
You may get codes from the computer as it expects the exhaust gas to lean out the mix, and w/o it the mix at part throttle will be quite rich. I'm not sure the computer can adjust far enough to bring the mix back into the proper range. But it is easy to try and put back if needed.
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/soon-to-be ZF5/3.55's & EEC-V MAF/SEFI