Bronze

My CEL came on the other night while driving home from a soccer game. I wasn't pushing the car by any means. Read the code last night and it was a P1136, system running lean.

It just so happened that I had filled up with gas on my way home from work about two hours earlier. Also, we had a production issue recently where our customer was experincing manufacturing end of line failures due to running lean. The root cause was that they changed over to the warm season gas in the plant's tanks, and the test limits were set just slightly too tight, causing the failures.

I cleared my code last night, and driving to work today it has not reappeared. I'll post an update if it comes back.

So, given that many areas of the country will start taking delivery of the warm weather formulations, I suspect that some of us will see CELs turn on, when the culprit is really the gas change over. Once the change is done, the ECU should eventually adapt to the new gas. But if your CEL turns on and it shows you running lean, I'd suggest you clear it and see if it reappears. If it's truly a hardware issue, it should come back shortly. If it's due to the gas formulations changes, you should be good to go.

Cuban B

I know gas can be an issue but I would just take a look at the line that feeds into your intake manifold to be sure. While mine was in the process of breaking up, the CEL lean code would come on every once in a while until it broke completely and the CEL was constant. Keep us posted.

Bronze

Didn't get to update, but last night the CEL went on again. I'll look around today or tomorrow.