shadowless

well i just finished doing a head gasket on my car, 93 es300 3vz-fe, and when i got it started it started right up, but the only problem was it went straight through to 4000rpm and stayed there and never went back down, i havent found a way to make it go down yet, i dont know if i messed up some of the vacuum lines or something, its like it has open throttle but the plate is shut and not stuck open,and no matter which way i move the distributor it starts right up and has no problem going back to 4k even when i move the dist. all the way to either side it starts right up and shoots and stays at 4k rpm. i have no clue what it could be and a little help would be nice, i am still pretty much a newb when it comes to a lexus anything helps. thanks

amf1932

I would double check the vacuum lines. If you have a vacuum leak, or a vacuum line that has a restrictor put in the wrong place, that would cause the higher idle RPM.

Pheonix

The throttle plate is being held open. Take the tension off the accellerator cable until the throttle can close all the way.


Get a timing light & set the dizzy back where it goes. (10*btdc with TE1 & E1 in diagnostic mode. 15-17*btdc is good for afew hosepower & throttle responce)

amf1932

Please let me know how you corrected this problem....I'm curious.

shadowless

ok the throttle plate isnt the issue, i know that one, i already checked the tension and its loose enough and i pulled the intake tube off and looked and same thing. so i know its not that,


i had the feeling it could be something with the vacuum lines, is there a place to start look when it comes to this??? it seems to compentsate almost instantly for any drop in rpm, whether i pull or plug hoses it then shoots right back up to 3500-4000 rpm range.

shadowless

sorry but like i said im a newb with these, what do you mean by diagnostic mode?