High and fluctuating Idle

[TO82]

Hi guys just finished buildin my new gt, had it started buteven once warm the idle was staying around 1200, then i took it for a quick drive and it started droping and rising when i came to a junction?

So what do i need to look for ive checked pipes for leaks and i cant seem to find any? Also which is the idle control valve as the engine had been sat for some time before i put it in my car, jut wondered if cleaning this may help?

Cheers

 

[FeNder]

i had this hunting problem with a faulty water temp sensor !

 

[TO82]

i had this hunting problem with a faulty water temp sensor !

Well it wasnt hunting at all until i drove the car it was just sticking at 1200

 

[Craig_GT]

can also be caused by boost leaks and also running "sounds" etc. that will use power.

Craig

 

[TO82]

can also be caused by boost leaks and also running "sounds" etc. that will use power.

Craig

Could that include the earthing, how many earthing points are there on a stock gt, and where are hey located?

Also which is the ICV?

 

[lingl9z]

ICV is at the left on the inlet mani mate and a bad earth on the gearbox can apparently cause this aswell as air in the coolant (happened to me) faulty sensors etc!

 

[TO82]

Right so thing to check:

Remove ICV and clean
Check earthing on Gbox
. . .

 

[munday]

Spray brake clean anywhere you could have an air leak

 

[RobSR]

go and cheack all your vac lines round the inlet mani etc..

 

[TO82]

Just snapped one of the ICV nuts lol

Have put an earth onto the gearbox as there wasnt one conected, will see if it has helped later, cheers for the help

 

[sx_turbo]

check the timing isnt out, if it's one tooth out on the belt, you will get this symptom.

it's fine when cold, but after driving and it's fully warmed up you will have this symptom.

happened to me, took me ages to figure out why

 

[TO82]

check the timing isnt out, if it's one tooth out on the belt, you will get this symptom

How would i check this?

 

[TO82]

check the timing isnt out, if it's one tooth out on the belt, you will get this symptom

But mine stays at 1200 if i just leave it to warm up? Doesnt hunt only once i drove it it started to?

 

[sx_turbo]

But mine stays at 1200 if i just leave it to warm up? Doesnt hunt only once i drove it it started to?

yeah, same as mine did mate.


it might not be mate, but it's something else to look at/check

 

[TO82]

Whats easiest way to check the timing?

 

[Derek]

http://www.toyotagtturbo.com/forums/showthread.php?t=41736&highlight=timing
Have a look through that dude might help.

 

[sx_turbo]

put engine in tdc via the crankshaft pulley.

on the camshaft pulley, there is a hole just above the 4e mark (from memory)

in the middle of that hole you should be able to see a small dimple that is embossed in the head.

that dimple should be bang in the middle of the hole in the camshaft pulley.

if you cant see this dimple through the hole your timing is out.

HELPFUL HINT: nick your gf's or mums make up mirror to look through the hole in the camshaft pulley, trying to do it by eye is near impossible.

 

[TO82]

Lol ,Cool cheers for the help

 

[cole]

sounds like the throttle position sensor nino akkis used to do it

 

[TO82]

i loosend it off whilst runing and moved it side to side but made no difference to the rpm?