I recently bought an im and tb for my d15b7 i installed the tb and im but when i went to put the nuts on the studs i ran into a problem the welds around the piping are to big for me to thread the nuts on the upper 4 studs. so i left them off so i could go to the auto parts store to find smaller nuts. i had no luck so now im going to have to take the im off the car and grind away at the welds.

My problem though is when i got it all back together without the top 4 nuts in place i fried it up and it was idling at 3000 rpms. What would cause this? all my sensors are in place. is it cause there isn't a good seal it the head?

I just want to make sure its not something else cause i dont want to spend all that time grinding the welds if the problem lies some where else. if worse comes to worse ill have to put the stock im back on.

Any Ideas?

 

You are talking about the four studs used to secure the throttle body to the IM, right? If the nuts for those studs are not installed, you will definitely have a massive intake air leak and therefore a high idle.

 

No i mean the 4 upper studs where the im connects to the head. there are a total of 7 studs but i cant get the top 4 to thread cause of the welds on the im.

 

Having only three out of the seven IM bolts installed is almost certainly causing a massive intake air leak.

 

Like RonJ@HT said any whole that is not sealed by a bolt or anything can cause major or little air leaks and that causes to have abnormal idle, and one other thang that can cause that is your idle control valve, not familiar with SOHC motors haven't worked on one in years but your idle control valve should be located at the back of the intake manifold right side,once you take that off there will be a screen that covers a inlet whole be sure that is cleaned .

 

Thanks guys. i just wanted to confirm that was the problem, before i took all that time to grind those welds.

 

yea there are 10 studs on im, 6 on bottom and 4 on top. when only the bottom done and torqued and the top all open u are gunna have a big air leak and the tps is gettin messeed and the motor is getin more air then read, so grind the welds back and redo all ur nuts startin middle to outward direction.

 

i had someone telling me that im and 66mm tb is to much for my setup. any input? i have a full exhaust cai some minor bolt ons. im eventually doing a mini me swap, possibly a vitara build and turbo. i know the tb will add power at higher rpms (above 3000) but will it hurt?

 

its a little overkill but it will be fine its not gonna hurt anything

 

i think im doin the mini me in the next week or so. but what if i bought fuel pressure regulator and fuel rail to increase the fuel pressure, would this help with the fuel to air ratio? (so i don't loose to much power in low rpms) i read in a haynes manual that it is safe to increase fuel pressure by 10% on stock injectors. (is that true?)