A buddy of mine is having a major problem with a vaccum leak. We have checked all vaccum sources that we can think of and we have not found anything. Any suggestions as to where else we can look. i just install t25 and 450cc it idiling up and down, could it be the injectors stock o-ring i mod.

 

idle air control valve.

i tihnk theres a stickey somewhere on how to fix it. i would say block it off.

 

i just find out my chipped ecu for uberdata.the basemap advanced the timing for boost will that make it idle badly while it cold. i dont have charge pipe on my turbo i just start it up to check for leak. it go from 15k to 2800k over and over while the engine is cold. i havent let it warn up let though it might br running lean or something.

 

look you need to say what kind of motor you have. i had a similar problem with my integra motor and i replaced the iac (idle air control valve) and that didn't fix it and it cost me 200 dollars. first check your coolant level and see if it is low. if the coolant level is fine then you probably have a problem with the fit(fast idle thermo valve) this part is attached directly to the bottom of your throttle body and has 2 coolant lines connected to it. inside this valve there is a white plastic retention cap that is threaded into the housing. this cap comes unscrewed after a long period of time. to check to see if this is the source of your problems take the intake tube off. INSIDE the throttle body on the bottom there should be 1 or 2 holes. one leads to the aic the other lead to the fit. put your finger over the hole and your idle should level out. if you aren't sure which hole it will be the one with a major amount of vacum, put your finger over one hole and then the other. you can either buy a new fit or if you are technicaly inclined you can fix the one you have. i hope this helps i know it took me a couple of weeks to figure that ---- out. good luck let me know if it works