[TuanTrang]

Well Guys,

It seem like i keep getting the problem with the high idle no matter what the outside temperture.

Most of time doesn't matter of the weather when i start the engine it always start up at 2000RPM and it take about 4 min least to get down to 1000.

New Maf Sensor from Denso.
No Leak.
Clean the Idle air Valve and Throttle Body.
Coolant is Fine.

Mile on car is 135k(Automatic).

Between a this 3 thing which one i should replace to get the idle to be good?

Vacuum Valve
Idle Air Control
New Throttle body(When i say new meaning a low mile one or has been fix).

 

[DSMBoost]

Well Guys,

It seem like i keep getting the problem with the high idle no matter what the outside temperture.

Most of time doesn't matter of the weather when i start the engine it always start up at 2000RPM and it take about 4 min least to get down to 1000.

New Maf Sensor from Denso.
No Leak.
Clean the Idle air Valve and Throttle Body.
Coolant is Fine.

Mile on car is 135k(Automatic).

Between a this 3 thing which one i should replace to get the idle to be good?

Vacuum Valve
Idle Air Control
New Throttle body(When i say new meaning a low mile one or has been fix).

The car is supposed to idle high when you start it up. It should settle down to around 700/800 rpm after a few minutes. Sometimes it might idle at around 1000rpm depending on certain factors, but it's mostly normal. If you have the a/c compressor on, it will idle around 1000 rpm.

If it always idles higher than 800 rpm, then you may have a vacuum leak somewhere, possibly the intake manifold.

 

[TuanTrang]

I mean correct me if im wrong, But it seem like even in a hot weather is still idle high at 2000rpm.

I don't know which of the thing above is need to replace, IACV or Vacuum Valve.

I just bought the Valve, Give me til wed and ill install it and see if it fix.

 

[DSMBoost]

I mean correct me if im wrong, But it seem like even in a hot weather is still idle high at 2000rpm.

I don't know which of the thing above is need to replace, IACV or Vacuum Valve.

I just bought the Valve, Give me til wed and ill install it and see if it fix.

2000rpm is definitely too high. Does your rpm ever bounce up and down?

 

[jin602_05]

is your throttle cable too tight? did you mess around with the Throttle body screw?

 

[TuanTrang]

2000rpm is definitely too high. Does your rpm ever bounce up and down?

Nope, It just take 4 min or so to lower it to 1000 RPM, Cold or Hot.

 

[DSMBoost]

Nope, It just take 4 min or so to lower it to 1000 RPM, Cold or Hot.

Like Jin mentioned, sounds like your throttle cable is probably not adjusted probably.

 

[TuanTrang]

Well I have new gas cap, evap sonanoid, and maf sensor. But still nothing.

What i found out that my celica doesn't have throttle body gasket.

http://www.amazon.com/Fel-Pro-61134.../ref=lh_ni_t?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

Is this important to have?

 

[DSMBoost]

Yes! You probably have a vaccum leak where the throttle body attaches. That will definitely screw with your idle.

 

[TuanTrang]

Wow, I just order the fel pro throttle body gasket, my is not even install. I guess that why it so bad.

But i still don't get how a missing gasket affect the high warm weather idle issues?

 

[jin602_05]

spray some electrical spray around... if it has a sudden change of idel, you find where the leak is coming from.

 

[Rhace GTS]

When this occurs, is it only on cold starts? As in, the temperature needle is flat? Doesn't matter the heat outside, the engine block is still cold. If so, this is normal. ECU does this to warm up the car faster. That's why it drops as your car warms up. Try installing the tb gasket and adjusting the TB cable for the 1k idle, it should be around 800 RPMs. Loosen up the notches a bit

 

[TuanTrang]

Yes! You probably have a vaccum leak where the throttle body attaches. That will definitely screw with your idle.

Well, after work i let then engine cool down abit and i work on the throttle, I think after 1 hour of working on it, the car start at cold 2000rpm then in 1 second it drop down to 1500rpm and less then 1 minute it 800 rpm.

Let me test again tomorow.

 

[TuanTrang]

Well never mind, test it again today on a cold start, in 3 min or so it go from 2000 rpm to 1,400rpm and the temp is still in cold.

 

[DSMBoost]

Check your throttle cable!