hillbilly deluxe

hey guys, a couple times a day when i am driving at the same rpm for a while my truck will give me the c.e.l. it will the proceed to shut off if i change the rpm either up or down. i did my research and found this to be most likely caused by a bad or going out o2 sensor, but my truck doesnt ever seem to store a code for this. no matter how long the c.e.l is on. i have a toggle switch wired in so checking the codes is as simple as flipping a switch. and when i do the c.e.l doesnt flash any codes. i know its probably not a big issue but it buggs the crap out of me some times. anybody kno what could cause this?

hillbilly deluxe

Anyone?

Terrys87

iTrader: (1)

Like you mentioned that changing the rpms will make the light go out. I have had a similar issue that you are experiencing and it was from a small vacuum leak. I would check/replace hoses as needed. Most likely your O2 sensor is in bad shape as well.

Gamefreakgc

Only CEL I had that would turn on and off was a code 25, Lean Air/Fuel Ratio. Don't assume that's your issue though. Mind ended up needing a valve adjustment since the fuel was exiting the chambers because of a stuck intake valve. But a code 25 could be a dozen different things, one of which is a vacuum leak.

hillbilly deluxe

whats weird about it is that its not storing a code in the ecu so its hard to find a starting point on where to find the problem. ill check for a vacuum leak and try a new o2 sensor first off.