my cooling fan quit working.Pulled the harness up for it and it lost ground somehow.Traced the wires all the way to the ecu and they looked fine.Looked at all my other wiring and the only thing fishy was my bank 1 sensor 1 o2.I had to extend it a while ago and I guess I left it sitting on the Tstat housing and one of the signal wires was grounded out.Re wired it and loomed it up and ziptied it,and the fan works lol.Fkn computers are weird.I have my car tuned for the fan on 100% all the time,and noticed immediately it wasn't kicking on and also the car was running incredibly weird.Just thought I would let people know what it was just in case your fan quits working and all your relays and fuses are fine.
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you have the fan running 110% of the time to help with cooling?

 

100%.Its always on when the engine is running.Helps keep airflow moving through the H/E while at a light/staging up.Just a theory I was thinking of that works.

 

hmm makes sense. guess its something to think about for when i get tuned.

 

Exactly.I noticed a pretty big difference in just the launch.Seeing it keeps IAT's down while staging up,instead of your IAT's climbing as you sit there and stage up.Plus keeps the engine nice and cool

Also want to add that with the o2 being grounded out like that(No MIL) was causing Rev hang,crazy idle search and extremely random misfires at idle.So crazy how a signal wire to a o2 can affect all these things and I could tell it was grounding out for a while because where the insulation was gone,there was a little corrosion building up,so I rewired the sensor to eliminate that section of the o2 harness.AFR's are a lot more steady at idle and at WOT.Still need to get re-tuned though as idle AFR's still jump around quite a bit.

 

It's a great idea.

When I had the LS i had Vince tune it so the fans came on earlier and ramp up quickly.

 

Yea even when I was NA,I had Vince turn it on at 190* instead of the factory 212*.Now with the blower and big FMHE,I like to keep it on 100%.I was getting ready to go buy another fan when this happened.Luckily,I'm pretty good with electrical and wiring and found out it lost ground.