Originally Posted by SubbinBlazer
Got around checking it. I'm getting CEL P0140 and I also noticed that when the vehicle is idleing at 500 RPM's the temp gauge is at normal operating (1/4) and when it's idling at 1,100 RPM's the temp gauge is at 100 Deg. Also noticed that when the temp gauge is at 100 Deg. the Blazer feels like it doesn't have much power, but when it's at normal operating temp, it's good. Vacuum hoses were in tact and in good condition aswell.Any thoughts? Thanks
I'm sorry... Those numbers make absolutely no sense.
EDIT: I See from looking up images you mean the first demarc after 100. NOT NORMAL operating temp. Normal is just left of 210 deg. About 195.
Either you thermostat is bad or your ECT sensor is.
500 rpm is not normal idle speed and neither is 1,100 rpm. Normal warmed idle is 650 rpm. If your car idles at 1,100 for more than a second or two right after cold starting, it's got a serious problem. Likely an air leak. If it does so hot, it's worse.
P0149 is the post-cat sensor and nothing to do with affecting performance. Fix the driveability problems and it may be ok.