16v bigport IDLE problems

[TOFU]

hi guy

got a JDM bigport out of a jdm trueno

has idleing problem

idle jumps up n down, about 600 then 1100 then 600 then 1100, 600, 1100, 600, 1100 etc.....

heard it can be leads, sparks, idle sensor and timing but not sure which one

if you know what it is or how i can test if there fautly let me know

i cant replace 5-6 items when theres only something wrong with one.

thanks

[haveaparty]

could be any of those things that u mentioned, i would start with a complete service (leads, plugs, oil etc) and see if it runs better, then i would look at adjusting ur throtel position sensor, or replacing it, but maybe could be ur dizzy needs tuning, a service can do wonders sometimes

[Skylar]

Tps.

Use the manual in the technical documents thread to set it properly.

[Sorry_Afk]

Also check for any vacuum leaks. I was missing a plug over one of the little nipple things and it was causing my idle to fluctuate.

[hachirusto]

make sure there is no air in the cooling system, my car was doing the same thing up untill I bleed the cooling system and it stopped hunting for idle after that

[McLEVIN]

mine does this too...and usually stalls

[Javal]

Tps.

Use the manual in the technical documents thread to set it properly.

This.


Also check for any vacuum leaks. I was missing a plug over one of the little nipple things and it was causing my idle to fluctuate.

This too.


make sure there is no air in the cooling system, my car was doing the same thing up untill I bleed the cooling system and it stopped hunting for idle after that

Sounds very odd, but whatever. Check your coolant too. It's always good to check your coolant.

[RacerMelb]

I would put money on it being a vacuum leak, check your hoses on the throttle body and make sure they are a tight fit and everything is blocked off that should be.

[Sorry_Afk]

Also make sure your intake manifold gasket is a-ok.

[mrbigport]

I hunted vacuum leaks for ages on mine only to discover a crack in the inlet manifold.
grab a water spray bottle or a can of wd40 and spray around the vacuum lines and ports, injectors, manifold gasket, tvis plate, tvis actuator, etc. if it starts to cough and miss when you spray somewhere your looking in the right place.
it only takes 5 mins to go over the manifold and costs next to nothing.