Ae71 4Age High Idle, Hunt.

[Anticeptik]

Hey all ive got a ae71 with a 4age conversion done.

now I'm just ironing out all the kinks and high idle is one sits at ~2k hot or cold, onc warmed up it gets a hunt every now and again.

 

Any ideas what this could be?

[thatdude]

check for vacuum leaks that could be one course of your problem

[Trev]

Are the throttle body wter hoses hooked up?

 

Check the water level.

[ke70dave]

unplug your TPS and see if it stops, if it does, you may need to adjust your tps.

 

i just kept adjusting mine until it sounded good. you can kinda hear it when it clicks into "idle mode" on the TPS (there is a microswitch in there to tell ecu throttle is closed)

 

else you have an air leak.

[Anticeptik]

can't find a vacuum leak as such ill double check tonight.

 

The water hoses on the t/b have been removed and blanked off with a plate previously.

I pressumed this may be the issue but took the plate of, re siliconed it which gave no difference.

 

Could the map sensor cause this?

[Anticeptik]

unplug your TPS and see if it stops, if it does, you may need to adjust your tps.

 

i just kept adjusting mine until it sounded good. you can kinda hear it when it clicks into "idle mode" on the TPS (there is a microswitch in there to tell ecu throttle is closed)

 

else you have an air leak.

 

Yeah sweet ill give that another shot tonight.

thanks

[LittleRedSpirit]

Hmmm.

 

Damaged vac lines, faulty idle control, misreading sensor, be it map or tps.

 

Does it sound rich or lean as it hunts up in the revs? If its lean sounding most likely a vac leak.

 

Did you make major dynamic changes to the motor, IE more compression, camshaft duration increase? What ecu?

[Anticeptik]

As far as I'm aware its a stock ae92 4age. inc ecu, inj, cams etc etc.

 

i brought another rolla and dumped it all into mine, hence i don't really have 100% knowledge on the motor.

 

How could i tell if it 'sounds' rich or lean?

There was a 044 fuel pump on stock lines and reg, which didnt make to much sense to me being a 5 bar pump, so i swaped it out for a vl pump, it was probably running rich before now i assume its allright.

I also jut wired up the thermo switch proprolly.

 

the hunt happend after i swaped the pump and wired up the switch propply threw a nc relay.

It happens more specificly when the it warms up a little now.

Edited March 25, 2011 by Anticeptik

[towe001]

Hey all ive got a ae71 with a 4age conversion done.

now I'm just ironing out all the kinks and high idle is one sits at ~2k hot or cold, onc warmed up it gets a hunt every now and again.

 

Any ideas what this could be?

 

Are the throttle body water hoses hooked up?

 

Check the water level.

Agreed.

Unless the throttle bodies been modified with a strip of metal from a coke can, you'll need the coolant lines to be hooked up with no air bubbles in it.

 

I wonder if the cold start injector is leaking :hmm:

[altezzaclub]

Start with an O2 sensor and find out if its lean or rich.. Lean is a harsh sharp stink and rich a sweet overpowering smell, but not easy to teach someone in writing...

[ke70dave]

Agreed.

Unless the throttle bodies been modified with a strip of metal from a coke can, you'll need the coolant lines to be hooked up with no air bubbles in it.

 

 

i didnt do anything with coke bottles on my 4age in the ke70?

 

i just blocked off everything with bolts and hose clamps.... and use the throttle stop bolt thing to crack open the throttle to allow it to idle.

 

downside is there is no idle up when it is cold....so you gota be a bit gentle until the car warms up.

[Anticeptik]

Agreed.

Unless the throttle bodies been modified with a strip of metal from a coke can, you'll need the coolant lines to be hooked up with no air bubbles in it.

 

I wonder if the cold start injector is leaking :hmm:

 

Yeah i said it was previously blanked off and i re siliconed it to make sure.

i actually thought that as well, I'm not running one atm now.

I thought that it may be stuck open so i disconnected the line and blanked it off. so there is no fuel going to it at all now.

 

Start with an O2 sensor and find out if its lean or rich.. Lean is a harsh sharp stink and rich a sweet overpowering smell, but not easy to teach someone in writing...

 

I'm not running a o2 there wasnt one when i brought the motor, i have one, ive been looking to fit one bot there is no where on what i believe top be trd copy extractors to fit it.

 

Also yeah there is a smell which that makes its way into the cabin that i can't seem to find, i know what you mean now but I'm not to sure to be honest smells rich id guess.

Edited March 25, 2011 by Anticeptik

[Anticeptik]

Just tried re bleeding the coolant system... seems fine

 

and i just upluged the tps and no difference

[LittleRedSpirit]

Cooling system is a seperate thing, your problem probably relates to air, fuel, or both. If its lean sounding, it will crackle and pop a bit, sound a bit harsher and have more of a bark to it, rich sounds a bit sweeter, with almost a faint gurle to it. Smell is a good indicator, lean smells like a clean chemical reaction has taken place, rich smells fruity and fuelly. Like when a car first starts up and is enriched, you have that fuelly exhaust smell. Again hard to teach on the webs. The reason I ask, is if you have a straight up vaccuum leak it wont be rich. Leads me to believe you have a fuel related issue, or a sensor giving bad info leading to an extra input of fuel. Did you keep the diagnostic plug when you wired the car?

[Anticeptik]

I didnt actually wire it, i brought a track car and dumped everything in mine, all i did is resplice the wiring into the dash the rest bolted up really.

 

I'm not to sure about the diagnostic plug, got a pic of one and ill have a look?

 

Much apreciated