I get this light on, first start up of the day. It seems the engine has to be cold to get it. I don't get any codes out of the computer though.
If I shut the engine off and restart, most of the time it does not come back on, but if it does, it will shortly go out again.
I don't know if I am doing it right or not, but I got a key from Advance auto parts, and when I try to get a code, I turn the engine off, then key on so that service engine light is on, insert the key in the upper right two holes and all I get is code 12, which AAP tells me is "no codes stored."
Anyone have an idea about what could be going on here? I've checked all vacuum lines to make sure they are on. Truck is running good, "for a change." Just put new injectors in it. Until I adjusted the TPS voltage I was getting surging and cut outs after installing new injectors, and the light would come on and go off during this. 88 s-10 4wd.
Hatt