okay guys, as the title states i have a fresh rebuilt mtor in my 4runner with about 20 miles on it but, theres always a but lol, when it warms up after a few minutes and you hit the brakes the idle goes way down and comes back up and keeps doing that until you release the breaks and it goes back to normal. Also, if you hit the brakes it does it, but if you engage the power steering by turning the wheel or holding it turned all the way it will stop surging. Im 99% sure it has to do with vacum, but i have looked and cant find anything that looks like its leaking.

Any help will be much appreciated and i know you awesome guys at YT will help me get this figured out quick! anymore questions just ask

 

oh also when you give it gas the surging will stop. it will only happen at idle when its warmed up.

 

One of two things...

Number one, You're idle screw is turned up to high...To fix this adjust your idle down to 750RPM's when its warm.

Number two, Coolant Temperature Sensor. On the front of the motor on the passenger side, $20.00 or so from Autozone. Cheap and easy to replace.

Im 99.9% sure its one of these two.

 

x2 on idle speed too high, see below:
- http://www.4crawler.com/4x4/TLCA_Tru...ech.04.09.html

 

thanks guys, ill lower the idle, its the big white plastic screw on the upper intake right? it might be the coolant sensor too. my gauge hasnt come up at all since the new motor was put in

 

The white hex head knob is the idle up valve:
- http://www.4crawler.com/4x4/CheapTri...ne_Pix/13.html

The idle screw in the big slotted screw on top of the throttle body.

 

haha yea i realized that as soon as i opened the hood, my bad. i idled it down and tat solved it! thanks! but i just noticed my number 2 injector is leaking

 

Air in the coolong system.You've got a air pocket in the bypass area of the Throttle body and the temp is off.

 

i burped the system already. i lowered my idle and it fixed the issue, now i just need one of you to come fix my stupid injector!

 

Take it back to the people who rebuilt it, because i doubt it was doing that before...

 

thats easy.

 

i rebuilt it lol... i fixed it and the injector today. all is well

 

Just finishing up my rebuild as well, had my injectors done by Wichthunter. Your gremlins almost made me think it could have been your Auxillary Air Valve. If it acts up again something to keep in mind i geuss...

 

hop everything went smooth with your rebuild, but i dont think anything with mmotors does lol. everythign is in working order but im gonna go over it all again tomorow. as for my temp gauge not reading, it wasnt plugged in.... lol