914 2.0 liter 1974 D-jet

After driveing it a around town today noties the RPM's got to high its ideling at 1500 rpm's sitting at stop light, engine temp is half way at the gauge .check linkage at the throttle valve & retrun spring and its doing it job sitting nice but couldn't lower it at the idel screw what the hell

Vacuum leak?

vacuum leak. Aux air valve is not closing or decel valve is sticking. Maybe also the vacuum unit is not retarding the timing.

ok I will look into that thanks

Hey Tman, Is that your boxer? Whats the shirt say?

Look for the small hose off on the decel valve. If the end is frayed, cut it off to expose new hose that will stay on better.

idle trouble shooting.. with your exact problem in the list of stability issues, wonderfull piece of info..

http://members.rennlist.com/pbanders/idle.htm

Ya he has pass away a few years ago and i put my work shirt on him and took this pic
its say Toyota Material Handling on it lololo
all Vacuum hose's are new

ok thanks cowboy i will check it tomorrow thanks to all for your help

just a thought...it could also be your TPS. If you're not getting to the idle setting on the tps, the idle adjustment setting on the ECU won't have any effect.

One check for the TPS: With the key turned to accessory, slowly press the accelerator to the floor...you should hear exactly 20 clicks.

(for the record, got that from George's tech tips 700 book.)