1999 GMC Jimmy Repair Question
Asked on January 1, 2012
Help
Hello I just bought the jimmy it run good for 2 weeks but one day it start buck really. So o change the gas fitter but it was not that I change the egr valve but was not that but when I unplug the egr value it stop bucking but its the car won't shift into higher gear so Idk if I should change the Catalytic Converter or something
Asked by fezukAnswer
Replied on January 1, 2012
P0405 Exhaust Gas Recirculation Sensor A Circuit Low P0406 Exhaust Gas Recirculation Sensor A Circuit High
Replied on January 1, 2012
codes are erased and have not returned?
Replied on February 27, 2013
I have a 93 Jimmy with a 4.3 vortec that is doing the same thing. I cleaned the EGR valve, OCV valve, and the idle air intake control valve and now it rarely shifts into overdrive. Runs a lot better and has more power but it rarely shifts all the way out. How did you fix it?