throttle body odb1

[leespeza 0]

hi all, think my throttle body senser has packed up ok when i start from cold it revs upto 2000rpm after 5 secs it goes down to 1300rmp then when temp is around 90 its still running high around 1000rpm as before it was 750-800rpm can anyone confirm it the senser

[legvw 0]

Why don't you adjust the idle screw on the side of the tb, i had to do that when i swapped tb's. Adjust it when its upto temp, and set it to what it was before.

[993turbo 0]

idle screw? Can the idle be adjusted? Isnt this the job of the ISV... ?

[muttley 0]

are you sure its the real idle reading, i'd have a look at your proper reading on the maf computer 1st before you adjust anything

[leespeza 0]

yeh but the idle screw hasnt been messed with is was ok before i changed the engine from odb2 to 1

[legvw 0]

Well if you went from 2 to 1 then you'll need to adjust the screw. OBD2 doesn't have an adjustment screw, and the isv is built into the OBD2 t/b. The isv controls the idle (to keep it smooth and regular) via by-passing the t/bt, but the t/b needs to be set too as when the engine is up to temp, the isv is no longer used-mostly used when the engine is cold (when it requires more air/fuel til warm).

[leespeza 0]

ok i bought a engine from the net which was odb2 and my car was odb1 i just swapped teh engines and left my odb1 setup on it thats when my revs started playing up.my m8 put the ethos on it and he said there was something wrong with voltage from the throttle body

[leespeza 0]

where is the idle screw located

[legvw 0]

Bottom right of the throttle body.

When i swapped odb1 manifolds+ t/b i had to adjust the idle like this, try it an see what happens.

[leespeza 0]

i tried that idle screw unscrew it and its still the same sometimes it will sit on 750-800 and the the other time s 1000rpm could it be the senser

[lowvr 0]

clean your isv with carb cleaner

[leespeza 0]

ok ive cleaned the isv and it still runs a on 1000rpm when warm now what lol

[leespeza 0]

could it be the lamba sensor