ive looked for this but couldnt find anything on it.
the ground wire that goes from the intake to the firewall gets hot,
anyone knows why?

 

Yeah, I've noticed that it will even melt the plastic connector. It definitely gets hot.
Though how much is from electrical resistance and how much is just from the nuclear-furnace that is a FD engine bay, is hard to say.

 

well that was the obvious answer,, the heat from the enginebay.
but i did the test, i waited till night and let everythng cool down, started the car
and the ground wire was the first thing to get hot, i touched the fire wall and intake manifold, and guess what?.... cold as ice but the wire was hot???????????

 

Wow, is your battery relocated? Is there another ground that maybe has a bad connection forcing more current through this wire?

 

If you haven't done it yet, I suggest adding a few more grounds.

Like Spuddies from 'Over the Hedge'....."enough is never enough".

 

A bad connection will get hot ,ground or not .Scrap the paint away under the wire connector and run a tap through the threaded hole .Clean the area and bolt on the UIM . Install a larger gage wire and recheck . How easy is that .

 

If it is your original ground wire -sounds like it - after all these years the plastic clip connection is shot. This bad design was in a TSB and often replaced under the 3k hesitation fix. You can get the replacement part without the clip from the dealer but better and less costly would be to buy a good ground wire and bolt it in place.

 

thanks psquare8 that is exactly what it does, it hesitates around that rpm.
battery is still in the original location, thanks for the help everyone.