im having an issue with my new rebuild, itwill not idle at all....it whistles in between revs now that i swapped the TB and UIM, i had a throttle body before that didnt whistle but it didnt seem to get the car going at all!!! i have got the car to stay alive but its still rough even when trying to keep it alive....rpm jump to 3k rpms right away i cannot keep them in between unless by coincidence...

YES i have searched and found this thread but i wasnt too sure i wanted to revive such an old thread:
https://www.rx7club.com/showthread.p...+manifold+idle

its a GXL, streetported 13bt using NA s4 rotors, using the NA wiring harness and all T2 electronic components: ecu, maf, pressure sensor, intercooler, s4 ported turbo....
it has 660 secondaries and a walbro 255 fuelpump...

i will post a video up soon... thanks.

 

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That is pretty weird my friend....did you check your fuel pump to make sure the sound wasn't coming from that? The idle could be a vacuum leak.

 

check in between the TB and your "elbow"(you know that rubber triangular seal,in between the elbow and the TB?)..it sounds like a Vac leak for sure.
I'd be checking all vacuum areas.just to be sure.

 

your manifold isnt sitting right. at least that is what has been the cause for me when i hear that whistle. ever since then ive always just put a small bead of ultra black rtv on every joint

 

okay i will check on that tomorrow guys, i think it is going to be a leak at a joint ive check my vacuum leaks and i will but starter fluid tomorrow and look for the issue by having some one spray it, hopefully i can have friend help me...

 

i know wierd sounds like a party whistle lol, but im pretty sure its not the fuelpump...

 

u know what ill check that one, when i seen that big oring looking think it did look like the rubber seal was already shot ill add a small amount of silicon to see if that helps the issue...

 

ill check, but i think the Mani is just hanging over i have the intercooler bracket but maybe it is causing stress on the LIM to UIM gasket... i didnt use rtv i just threw in the gaskets because i didnt want to keep having to remove the manifolds and mess up new gaskets every time i removed the manifold.... i will look into it for now, i kinda figured that it wouldn't make a leak if i didn't add sealant....

 

it definately sounds like air squeezing past rubber or something. as said above check all vac and seals in your mani

 

will do tonight or tomorrow night thanks...

 

im not a big fan of reusing gaskets. but then again i double check things after i figet tighten everything

 

misterstyx69, it was the elbow that u had said. i took the UIM/the tb and the wlbow on the tb off and pressurized it with a pipe and sure enough it as leaking through the elbow, making the whistle....


but that JUST fixed the whistle not the car has a hard time staying on....starts up fine and stays on for a a minute or so, and just cuts off, could it be the thermowax pellet? or what could it be?

 

my turbo is leaking coolant and smoking lightly, but i know for a fact that its not the turbo... could it be? the turbo it seems fine it will be replaced soon, but its a constant leak it the leak i believe is coming from when i ported the turbo and put it back together its leaking on the hot side by the coolant feed... again the car ill stay on but i have to keep it alive.....

 

will post a video up soon

 

OKAY, now the car stays on but only stays on and idles nicely when started COLD, it will stay on untill i give it gas, then it dies. after it dies, it doesnt want to start again, unless i keep it alive.

like f a vacuum leak is created when the car gets warm/hot..
could it be the thermowax??? becuase it idles nicely then when i give it a light rev or a heavy rev itll die....TPS is at .99 to 1.01 it varies. all vacumms have nipples or they have a line on them...i need help guys... this is frustating its been almost a month since ive gotten the engine back from the shop.....


thanks.

 

use the adjustment screws on the dynamic chamber and throttle body

go through the fsm on how to set the idle.

4B page 80 of fuel/emissions turbo..

make sure your neutal switch is hooked up

 

does that apply to cars with all emissions removed

 

The idle adjust screw on top of the Dynamic Chamber is not related to the emissions equipment.

 

does that screw have some kind of wax or black puddy on it?

 

It might, but the adjust screw is surrounded by the Dynamic Chamber and is not to be confused w/the secondary plate adjust screw on the very front of the throttle body.

 

You said it was a fresh rebuild correct? Well you are going to have a hard time keeping it below 1K untill it has got a few hours of run time on it, get it where it is idling around 1200-1500 and let is idle for a hour or so, checking for leaks and watching the coolant temp.

It should start running better after time, but another video would be nice.

 

ok i will post a vid....again which one is it i don't want to mess with the throttle body and totally mess up the whole butterfly mechanism... any pics?

 

I don't have a pic right now, but you can also increase the idle a little by righting the throttle cable witch in turn will open the throttle up.

 

i did that but the throttle cable option only makes your idle go up more ill try it out... thanks.