Do sensor problems ever set codes without causing check engine light to stay on during running?
Real clean car, @90K miles . This week developed problem - Starts and runs fine until warmed, then stumbles and idles very low or stalls on decel. Once warm will start fine but cuts out, or loses power then stumbles and jerks. Basically undrivable. If I let sit for a little while it will run OK for a short time until warms up then hesitates and stalls again.
Thorough inspection does not find any induction plenum leaks or hose splits. My gut feeling is MAF problem or other critical sensor but dash check engine lamp (orange dash lamp) LED lights with key on but does not stay lit once started.
Are sensor problems like MAF, TPS etc ever present without check engine lamp?. I did find a lot of info here when I searched on MAF . But I have not done check codes procedure on ECU since CHECK ENGINE lamp is not lit. Also the info in forum seems to be for OBDII which I believe is post '95 and second item to check in Chilton's and posts is the IAT but the '93 doesn't have one I can find.
Help, hints not anecdotes appreciated, THANKS - PB
