car idles at about 1500 rpm .. before i changed my spark plugs it was idling at 750 rpm .. after changing my spark plugs i knocked the vacuum tube going to boost sensor loose .. i let it idle .. and it was going all crazy (bucking and smoking) .. turned off the car .. let it run again .. same **** .. put car into gear (while holding down the clutch) .. rpm would start rising .. after many helpful replies on the forum i realized the vacuum going to the boost sensor was in fact disconnected so i replugged it back in and resetted the ecu .. the bucking went away .. didnt smoke as much .. but now the rpms are still high as **** (1500 rpm) ... ive tried adjusting the screw under the elbow leading to the throttle body .. and the two screws on the throttle body .. still no luck .. help me get my idle back to 750 .. oh rx7 gurus what should i do!?!?

 

Does your car have cruise control?

 

vac leak

spark plugs not tightend all the way???

 

yes it has cruise control .. i think the spark plugs are tighted all the way .. im pretty sure .. almost 99% .. i did take it to the dealership today .. the guy sprayed some spray on it .. said its a vac leak .. somewhere near the throttle body i believe .. gonna go check up on it now

 

should i be hearing a hissing sound as i turn the screw under the elbow leading to the tb?

 

Check the cruise control cable going to the throttle body. Make sure it's not being pulled too tight.

What all did you remove to do your spark plug change?

 

yup checked it .. its on right

removed the elbow and throttle body to do spark plug change

i just changed the hose going from the throttle body to the boost sensor .. still no luck .. car is idling at 1500 now .. wtf .. its driving me nutts

so far ive tried
adjusting the screw under the elbow towards the tb
the two screws on the tb
checked the tb cable and the cruise control cable
replacing the hose from the tb to the boost sensor

 

First off I'd adj. all the screws back to where they was since the car was running just fine before the spark plug change. Second leave on the throttle cable but take off the cruise control cable to make sure thats not it, but FIRST make sure you set all the screws back otherwise taking that cable off isnt going to mark that possibility off the list.

-Alex

 

yup did that .. readjusted the screws .. unplugged the cruise control cable

still idles at 1500 rpm

went under the car .. took the spark plugs out .. put them back in .. made sure they were on tight .. car still idles high
im all out of ideas now .. someone please help me figure out why its idling so high
if this helps any, according to my boost gauge the vacuum is at about -17.5 to -18

 

so you took off the TB, is the gasket there leaking? that would be a vacuum leak since it's after the throttle plates. did replace the gasket? Get yourself a can of carb cleaner and start spraying around. when you find a place where you spray and the rpm goes down, you found a vacuum leak.

 

omg dude thanks .. that was the problem!!! you dont know how close i was to blowing my head off after spraying the carb cleaner on the area between the tb and uim the rpms dropped dramatically .. i love you man