i had a bad idle and bad fuel milage i thought it would be my o2 sensor so i changed it i still have a bad idle (800rpm sometimes 750rpm) i didnt take the truck out yet so i dont know about gas milage does anyone else know wut else can cause this low idle?

 

if in fact u are running that rpm speed u are doing just fine.. that is normal... if it is wayyyyy lower like almost dying then keep checking around and i will see what i can see. also have u checked the TPS? May be that but if u are 750 800 u are right on it..

 

timing
o2 sensor
TPS
coolant sensors

are ALL major factors in loss/fuel economy


I have just went threw 2 years of 300K per tank woes .. replacing sensors , checking , tweeking .. ahhhh .. so I'm bald now .

I replaced almost every sensor .. EVERYTHING .. except airflow meter and computer .

I did some checkin' . I had the Original throtle body , which I cleaned , and thought I would set it up the TPS .. as per the factory specs .

problem is .. I cant get a consistant reading on the meter , because of the throttle shaft movement . my throttle body is toast ..

so I check all 3 that I have .. same thing .. I check the supra throttlebody im building .. no play . DANG ..it's perfect ...


I check with toyota .. part # 22210-35150 replacement .. NO LONGER AVALIABLE ... this sucks ..



sorry for the long wind .. but I forund a good throttle body ..finally .. set it up with my ohm. meter , and seems to work good now ..

3 days now and I have already noticed an improovement in my fuel economy .

 

What was your tps like when u took it off outa curiosity? Mine doesnt snap back all the way when i wind and release it.. it always snaps back slowly and to a different spot.. I cleaned it up and I think it worked better for a bit but now i think its back to its old tricks...

 

it was real stickey as well ... I used some pen.fluid (very little) on it and freed' it up ..

 

did u try runnin it on the truck once it was freed up?? I presently am using it after lubeing it and i found it good for about a day (unless it was my imagination) and now my idles a bit erratic again... (i am waiting on a new tps i ordered off the net)