Low idle state: What does it mean?

[burgerwitfry]

yea, i wondering what is the common problem causing low idle state because my idle state will drop to about 500 rpm and even sometimes 300 rpm where it should usually be at 700 rpm. So anyone who knows ill be grateful thanks.

[Axel Grungy]

Is it consistently that low?? or does it idle normal then drop to 5 or 300???

[burgerwitfry]

it would idle at 700 rpm then drop to about 500 rpm sometimes 300 rpm and then goes back up to around 600-700 then drops again to 500 rpm and it keeps doing that.

[Axel Grungy]

theres tons of threads about idle problems, do a search and you will come up with alot. Id check for vacuum leaks, and the connection on your Coolant temp sensor, it might be gummed up.

[BreedOfSpawn]

I had the same problem first off clean the throttle body that helped stablize the idle but I'm still fixing the dropping problems when I come to stops.

[burgerwitfry]

exactly, it drops when i stop, even once it drop to zero and my engine die so i stop driving it.that's what i thought b/c my intake tube that connects the intake to the throttle body was crack, so i stop driving my car until i get a new one.ill get back on you probably Friday when i replace tomorrow to see if it still low idling. thanks
Modified by burgerwitfry at 5:15 PM 7/19/2006

[burgerwitfry]

i just replaced the intake tube and clean the throttle body and it seem to be fine at idle now thanks, but i still have the same problem when at stops like you, im thinking i maybe the o2 senor, iono.

[BreedOfSpawn]

Check the AICV , and take off the AIV valve also check the alternator and that should fix it. Alternater only needs to be checked if your having rpm droppage when the lights are turned on or anything else that requires more power.

[Red coupe]

theres tons of threads about idle problems, do a search and you will come up with alot. Id check for vacuum leaks, and the connection on your Coolant temp sensor, it might be gummed up.

vacume leaks normaly cause a rise in RPM, I guess he could have a leak, and the IAC tuned to compensate, and that leak fixes its self once and a while but....

that's what i thought b/c my intake tube that connects the intake to the throttle body was crack, so i stop driving my car until i get a new one.ill get back on you probably Friday when i replace tomorrow to see if it still low idling. thanks

I wouldn't put to much hope in that, when the car is idling the throttle plate is closed...besides I am not sure what a crack could do besides mess up smooth air flow through the intake while the throttle was open or introduce unmetered air....but neither of those would cause the engine to drop RPMS like that.

So the idle will drop when the car is sitting still, and not bounce right back up?

[BreedOfSpawn]

No the idle drops when he hits the clutch while coming to a stop, Same problem as me right now.

[burgerwitfry]

yea exactly right, when i hit the clutch and brake, you think its the AVI valve?

[BreedOfSpawn]

Here you go bro check this thread out, started it a bit earlier had same problems as you a few members did alotta work to help me out with pictures and diagrams hope it helps you out as well.

zerothread/185829

Let me know if the problem starts to get better.

[vancouverbc]

Everybody has this problem. Clean your IACV and disconnect the hose going from your AIV unit to the air filter. Clean your throttle, as well.

The end of this thread has some pics of the IACV. If you have a multimeter,test the two solenoids assoc. with IACV when you have it out for cleaning.

zerothread?id=124542

[burgerwitfry]

thanks for the refrences by i'm having a hard time finding the iaa unit, its it in a different place for the KA24e SOHC engine because im looking there but don't see it. And on cleaning the aiv vavle, i cleaned but it seems to make the problem worst, does disconecting it and puting a filter on it really helps the idling?

[vancouverbc]

The IAA units are approx. in the the same place. Disconnecting the aiv helped my idle a lot. The main thing though is that the aiv is sending water and exhaust into the intake shroud which causes big problems for maf and dirties the the throttle body. The hose from air filter is supplying intake air to the aiv unit. AIV unit is next to useless. Was discontinued with 1995 year.

[180fan]

Actually the AIV was used to pull air into the cat to help it warm up sooner. But yes, the aiv is nothing but trouble unless you need to pass smog. Those stupid reeds on the inside of the AIV always seem to spread out too wide

[vancouverbc]

Here, in british columbia , Canada, they did not check to see if I had my AIV and I passed easily without it. It doesnt make much difference in the emission readings. Ironically, the dealer refused to look at my car because I had the AIV off. My car would not idle properly at all with AIV. For most people, it is best to only disconnect the hose going to air filter. That way all the crap doesnt go into intake shroud.(assuming your reed valves no longer work) My air filter and maf were rusted away from the water in the exhaust.

[burgerwitfry]

quick question, what did you guys use to clean your throttle body and how did you clean it deep inside b/c i can only clean near the outside of it.?