billschroeder5842
03-22-2019, 10:42 PM
So I had a SES light come on briefly on my 91 then go off after about 15 seconds of running. The engine was lukewarm having sat for about 5 hours after a run. I took the car for a quick spin and it ran great with no SES lights returning.
I got home and I jumped AB on the ALDL and got a "13" or left oxygen sensor. I then jumped AG to get into the ECM diagnostic and got a H31 in module 1. I cleared the codes on the ECM and went back to try the AB jump again and only got "12" so the code cleared.
My guess is that the engine momentary ran rich (love the bank fire!) after start but quickly cleared itself with a little heat? Anything to check or just chalk this up to my LT5 having a "moment?"
I got home and I jumped AB on the ALDL and got a "13" or left oxygen sensor. I then jumped AG to get into the ECM diagnostic and got a H31 in module 1. I cleared the codes on the ECM and went back to try the AB jump again and only got "12" so the code cleared.
My guess is that the engine momentary ran rich (love the bank fire!) after start but quickly cleared itself with a little heat? Anything to check or just chalk this up to my LT5 having a "moment?"