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R33 S2 Gtst Mystery Idle Fluctuation

Direstraights26
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Direstraights26 Apprentice

Direstraights26

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G'day guys i finally bought a skyline but its having a little issue i was wondering if anyone can help me.

1st thing: when i put the aircon on the revs lower 400rpm and stay low. Is it the FICD?

2nd thing and i think there related: any load i put on the car (lights,steering ect) revs drop and stay low,if i just slightly open the throttle just a teeny bit and find the right spot,(might take a min or 2) it will lower revs bout 300rpm and idle fluctuates.but after i find the spot and i opening her up a little bit more it dissapears.

it only does in the one spot when opening the throttle slightly.

Is the AAC and FICD blocked or sticking?

And are they both in the same housing at the rear of the manifold?

Its giving me the shits as soon as i drive off clutch out,slight throttle it fluctuates and carries on.

any help guys would be appreciated.

Direstraights26 Apprentice

Direstraights26

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Ok i took it off and it seemed not that dirty and nothing was clogging the air bypass were the screw goes into.

also turned the a/c on and unplugged the FICD and i could hear it clicking...but no change in idle? It should increase RPM

That part could be clogged? or need replacing?

I also just noticed the fluctuation (maybe misfire) it happens more when warming up but decreases when warm but its still there.

Maybe TPS?

tripsteady Proficient

tripsteady

Posted
Posted

Ok i took it off and it seemed not that dirty and nothing was clogging the air bypass were the screw goes into.

also turned the a/c on and unplugged the FICD and i could hear it clicking...but no change in idle? It should increase RPM

That part could be clogged? or need replacing?

I also just noticed the fluctuation (maybe misfire) it happens more when warming up but decreases when warm but its still there.

Maybe TPS?

if its a misfire then its almost certainly your coilpacks.Have you replaced them? Gapping plugs to 0.8 and splitfires fixed my misfire problem , revs would drop down with noticeable misfire and jerk at wide open throttle.

Direstraights26 Apprentice

Direstraights26

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if its a misfire then its almost certainly your coilpacks.Have you replaced them? Gapping plugs to 0.8 and splitfires fixed my misfire problem , revs would drop down with noticeable misfire and jerk at wide open throttle.

I gapped the plugs yesty heat rand 7 good plugs,fouled from slightly rich tune.

and there brand new spitfire coil packs.

WOT no missfire,

It seems like a apparent miss or hunt when i just touch the throttle and i have to hold it at right spot for it to do it im talking like .5-1mm

of throttle movement and it happens.

if i

tripsteady Proficient

tripsteady

Posted
Posted

I PM'd the video it would let me upload it otherwise. its cold first off then its warm n sits just below 1000rpm then when i touch it its flickeres up and and down

cant see the video

upload it on youtube or on www.mediafire.com and give me the link

Direstraights26 Apprentice

Direstraights26

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Yes and gapped to .8 as everyone does, in this forum anyway. I cleaned the AAC unit and adjusted my tps and cleaned my maf.

Problem now instead of fulcrum ting (hunting) if I put any load on the engine it will drop idle and carry one untill I open the throttle up

tripsteady Proficient

tripsteady

Posted
Posted

Yes and gapped to .8 as everyone does, in this forum anyway. I cleaned the AAC unit and adjusted my tps and cleaned my maf.

Problem now instead of fulcrum ting (hunting) if I put any load on the engine it will drop idle and carry one untill I open the throttle up

that sounds like a deeper issue

the only things that would cause that , that i know off are all the things you've already cleaned & checked. tps , maf , splitfires & plugs...

coils and plugs are the number one issue for this....

where are you located? My mechanic Paden from Unique Automotive (in villawood sydney) is a genius and Im willing to bet he can diagnose this by just listening to it.

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