nice job on that tb.. I dont have issues with mine either. There are two screws on the bac that hold that coolant line onto it, you can remove those and that metal piece will come off. I haven't had any probs with my bac not having coolant pass around it.

 

Technics, you say you have a 750 idle yet you have removed the pots that Mazdadrifter was talking about. Or are these the parts you were talking about Mazdadrifter? Anyways, I removed these pots too, and my idle is at 1500rpm, I have tried setting the bac to adjust the rpm but can only achieve about 200rpm lower. What can I do to get a lower idle?

 

Are you sure your throttle cable isn't over adjusted? I had a 2000 rpm idle for about an hour I couldn't figure out when I reinstalled a UIM.



Don't forget to check the simple things..



Could also be a vacuum leak?

 

I didnt check the throttle cable, but will do again

 

i wrote a really good list of everything to check over to make your idle perfect, search the forum (i normally dont say this but im on break from work) i'd say it was 3 months ago max, and search using my username so its more precise i go over everything you should set and check.



my TPS adjustment just loosened up on me so for the first time since my tb mod i dont have a perfect idle, ill be readjusting it this afternoon tho so its all good.



kevin.

 

Yeah, I managed to get it right, ended up fiddling with the tps ajustment, the idle adjustment on the back of the tb, and the bac valve. Idles at a pleasent 750rpm now