WTA: Problem about Idle RPM not smoothly when turn on air cond.

[kahwee81]

Dear Sifus,

Hi all, im driving a year 93 AE100 stock engine.My RPM drop around 500 rpm when I turn on my car air cond or sometime until engine turn off. Can any ppl noe wat is my engine problem? Is it bcoz of d IAC valve spoil already? I did saw someone is selling d toyota IAC control unit last time, but now cant find d thread n cant remeber where is d thread.

 

[kahwee81]

anyone can help?

 

[kahwee81]

help help help

 

[danny_rigid]

Just find at halfcut shop lo! Comfirm iac valve!

 

[kahwee81]

bro change d ficd dy, now engine is more stable after on d air con. now my setting is 1.2k rpm when idle(din on air con/shift in gear/on head lamp), 0.9k rpm when on air con n 0.8k rpm when shift in gear(auto) and air con. is dis a normal setting? coz after i on air con,rpm did raise a few but drop to 0.9k rpm. isn't it should be back to 1.2k rpm? if i set 1k rpm for idle, my engine rpm will drop untill turn off. o is it i brought a faulty ficd?

 

[spawn_again]

Dear Sifus,

Hi all, im driving a year 93 AE100 stock engine.My RPM drop around 500 rpm when I turn on my car air cond or sometime until engine turn off. Can any ppl noe wat is my engine problem? Is it bcoz of d IAC valve spoil already? I did saw someone is selling d toyota IAC control unit last time, but now cant find d thread n cant remeber where is d thread.

huhu...same with me bro...already ask the a/c shop but they all said donno...somemore worst is there's a leakage,1month all the gas gone oledi...but i'm driving SVT(se limited)...if someone can help us..plss..

 

[scomatic]

ermm... are the air cond is on... the car become abit heavy than usual? I face this problem, but dunno is same or not...

 

[wilm3]

ermm... are the air cond is on... the car become abit heavy than usual? I face this problem, but dunno is same or not...

i think this is normal cos few 'ekor' of horse were taken to run the air cond pump...

 

[scomatic]

i think this is normal cos few 'ekor' of horse were taken to run the air cond pump...

no.. i didn't mean that... i mean... when air cond is on are it heavy than previously you on the air cond or not?

if yes, pls check the compressor... i think inside might got a little bit jam... same do i last time faced... conclusion... try swap another compressor... then you will know... are it really a little bit jam or not...

 

[Raymond_Hu]

Mine also having idling problem but different. The idling when to 1.2kprm when aircon on. If off air-con the idling is shooting to 2krpm.

Anybody know what may be the problem?

 

[BDK8671]

i think for SVT ......the AFM oso can make the problem of the stability of the rpm .....
juz my 2 cent la ....hehe :proud:

 

[dennisdreams]

you should try disassemble your throttler body and do a full cleaning, i once face almost the same problem and cleaning the TB really work. remember to clean all the vacuum piping as well.

 

[chinozie]

possibilities :

1) AFM no so nice already...try to swap with your colleague...see the idling on both car...


2) ISCV clogs...clean it

pics after 1st attempt cleaning the ISCV

3) TB (throttle body) too dirty...go and clean it...

Still cannot...go find your self a mechanic...

 

[SE.G]

hello guys,i have problems with related with aircond too,when iever im not using aircond the idling is quite stable around 800-900rpm,but it will shoot up to 1.3-1.5k rpm when i TURN ON the aircond,its the reverse effect as compare with other engines,i have face this from my 4afe days till today after I change my engine to svt.....puzzle puzzle :hmmmm:

 

[spawn_again]

thanks to chinoize,scomatic,dennisdreams and bdk8671 for some clues...after i'll find the answer i'll try to post the root cause here...thanks again bros...

 

[artnet]

hello guys,i have problems with related with aircond too,when iever im not using aircond the idling is quite stable around 800-900rpm,but it will shoot up to 1.3-1.5k rpm when i TURN ON the aircond,its the reverse effect as compare with other engines,i have face this from my 4afe days till today after I change my engine to svt.....puzzle puzzle :hmmmm:

same problem as me dude... will send to mechanic tomorrow.
although i have no RPM meter. but i can feel it isn't normal.
used to own svt, bt... the current ride is with 4AFE, having this
problem same as my BT. SVT is damn low rpm.. totally opposite.
for both cases.

one thing i notice for this BT and 4AFE, the rpm rise when the
temperature gets colder. like after a cruising come to a stop.
rpm rises high then slowly come back to normal again.

it causes high fuel consumption! RM100 for 300km only.