Ae95 High Idle!!

[4wdwgn]

the engine is a 4A-GE, i've read someware that if the throttle body coolant path has a air bubble in it it can cause high idle, can someone tell me how to bleed it? I have tryed buy removing the rear hose while engine running but that didn't seem to help..

[Evan G]

have you check for vacuum leaks?

[Hiro Protagonist]

To bleed an air bubble out of the cooling system, jack the front of the car up so that the radiator cap is the highest point in the system, and take the cap off (you can tape a Coke bottle upside down with the bottom cut off to the filler cap to act as a funnel too). Then, turn the engine on and let it run whilst massaging the coolant lines near the throttle body (where the air bubble will be). If you pour some extra water/coolant into the Coke bottle, it will add hydraulic "head" to the system and force the air bubble to rise to the highest point. When you start to see bubbles coming up into the bottle, then you know that the system is bleeding properly. Once the bubbles have stopped (check that the idle has dropped to the warm setting, too), then pull the bottle off, put the radiator cap back on, and you're done :)

[4wdwgn]

have you check for vacuum leaks?

 

where should i be looking for vacuume leaks (most common places)?

 

To bleed an air bubble out of the cooling system, jack the front of the car up so that the radiator cap is the highest point in the system, and take the cap off (you can tape a Coke bottle upside down with the bottom cut off to the filler cap to act as a funnel too). Then, turn the engine on and let it run whilst massaging the coolant lines near the throttle body (where the air bubble will be). If you pour some extra water/coolant into the Coke bottle, it will add hydraulic "head" to the system and force the air bubble to rise to the highest point. When you start to see bubbles coming up into the bottle, then you know that the system is bleeding properly. Once the bubbles have stopped (check that the idle has dropped to the warm setting, too), then pull the bottle off, put the radiator cap back on, and you're done :laff:

 

cheers mate just the sort of thing i was looking for.. :)

[rockcox]

Don't know if you got this sorted, but mine was doing the same. It was the cold idle air valve which opens to let air around the throttle. It is open when cold and closes when the coolant temp rises. There are two little hoses from the water pump into the inlet manifold and they were blocked so the valve never closed. It also caused a massive flat spot in engine response because the inlet never got full vacuum.