The Service Engine light on my 97 Blazer with the 4-6L V-6 comes on and goes off repeatedly, mostly on. It has been on the computer both with the light on and with it off. There are no codes shown, either active or in history at either time. All the sensor readings were checked and were within the proper ranges. I know the owner's manual says that changing brands of gas can make it come on, so I have tried staying with one for several weeks at a time with no change.
Does anyone have any idea what can be doing this?
The only other things not right are the fuel gauge and the outside temperature repeater above the window. Could these be related?
Anonymous2007-09-02T01:03:03Z
Favorite Answer
sounds like the ecu is performing self test on the egr o2 sensor systems. does every 15seconds or so. if the egr passages are getting clogged, the ecu commands a light for self test. the next test passes and is not sent to history. the computer uses the egr to test the 02 sensor. it has to happen quickly to pickup changes in available oxygen in order to trim fuel. have a cheap fuel injection service performed. dont use the bottle stuff on the shelves. not strong enough.
the only thing i have seen cause this that couldn't be found for a while was a bad gas cap,it wouldn't hold pressure,and this would set the light off,but it wouldn't give a code for it,the only way we found out about it was we lost the cap and had to buy a new one,then the light went off,and that was done by accident,you might try changing the cap on it,that may take care of it,good luck on it.
i understand you do no longer pick any solutions that contain taking the automobile someplace... yet whilst your provider Engine gentle got here on around the comparable time your automobile started shaking in 4th and 5th kit it may desire to supply you some sensible information appropriate to the project. bypass to AutoZone. they could lookup the examine Engine code (that is unfastened by way of the way...) that your automobile is pulling and supply you a concept of what could be incorrect. Write the code down and do a touch diagnosis on it interior the direction of the internet. it is your suited guess.