View Full Version : fuel trims have gone crazy
BigM460
11-30-2014, 12:28 PM
Need some help figuring out what is going on? Have the fuel trims kind of flat lining. Am using the Torque app to watch them with, but they seem to be either topping out or bottoming out and then just sit there.
Have checked the connections on the O2's and they seem fine. Started watching after it started wanting to miss fire after washing the car.
Doing it on either side and sometimes both? New headers causing this???:confused:
The O2 voltage is what is flat lining.
Fastbob
11-30-2014, 12:38 PM
Did you wash the engine? If so check to see if you got a coil on plug wet.
justbob
11-30-2014, 12:39 PM
I've had this happen twice after washing the car. Once an engine wash (never once an issue before), the other an automatic wash plus undercarriage. Both times I finally gave up chasing the "ghost" and after three days of sitting the first time and 5 days the second, all returned to normal. I went as far as dissecting the main harness..
After ten minutes of both washes it was flat out dead.. I can say I was putting to the floor in neutral at the light to keep it running during alternating fully pegged rich and lean conditions in complete "I don't give a **** mode" and it never did detonate.
Bottom line it sounds like something got wet like mine. Hopefully you find out just what and report back! I tore my car down and dried EVERYTHING to no prevail.
Builder Of Badassery
BigM460
11-30-2014, 12:52 PM
I've had this happen twice after washing the car. Once an engine wash (never once an issue before), the other an automatic wash plus undercarriage. Both times I finally gave up chasing the "ghost" and after three days of sitting the first time and 5 days the second, all returned to normal. I went as far as dissecting the main harness..
After ten minutes of both washes it was flat out dead.. I can say I was putting to the floor in neutral at the light to keep it running during alternating fully pegged rich and lean conditions in complete "I don't give a **** mode" and it never did detonate.
Bottom line it sounds like something got wet like mine. Hopefully you find out just what and report back! I tore my car down and dried EVERYTHING to no prevail.
Builder Of Badassery
This sounds a lot like what is going on. It was at a car wash. Doesn't seem to be miss firing any more, but seems kinda hokey. Might just be me. Usually the O2 voltage oscillates up and down, not at the moment though.
BigM460
12-01-2014, 04:33 PM
Everything is back to working properly today. Guess he O2's getting wet caused this. Hope this isn't something that happens when it rains!
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