fredhouse said:
I'm changing my Throttle Body and my question is should i disconnect the battery or pull the pcm fuse when im done.I watched a video by MAY03LT but it was a I6 4.2.
I'm guessing its the same but want to be sure.THANK YOU FOR ALL YOUR HELP!
You're changing it or cleaning it? The idea is that your truck's PCM has changed its settings as your TB got dirty and now you need to reset it in order to get it to realize that the TB is clean again.
You do that by cutting power to the PCM. If you pull the PCM fuse, it will only cut the power to the PCM. If you pull the battery, it cuts power to everything in the truck.
Pulling the fuse will reset the PCM memory causing a relearn to hopefully take advantage of your now clean throttle body. By not disconnecting the battery, you avoid the negatives that come along with that, such as possibly killing your HVAC actuators.
Of course, some guys think that babying your actuators is a bad idea so they don't really consider this a negative because they figure it would be better to have them fail while you're working on the truck anyway rather then at a really bad time in the future.
I don't believe engine type makes a difference as far as this topic is concerned.