Hi can any body help me please i have a ae82 4age I'm having a bit of trouble with the revs sticking wen i down gear.

like wen i have been cruzing for a while at about 60 at one speed then go to slow down the rev stays high . then every now and then wen I'm at the light it just starts sorta reving then dropping revin then droppin can any body help me with what it might be . cheers guys

Edited October 31, 200916 yr by burnoutman

clean throttle body,it has to be sticky there.if not check and clean your throttle speed sensor??

clean throttle body,it has to be sticky there.if not check and clean your throttle speed sensor??

Hi mate i have cleaned the throttle body a number of times it don't really make much of a diffrence just a little bit more responcive?

what one is the speed sensor?

Check the water level and make sure the cooling system is bled properly.

Is the idle going up and down between ~1000 and 2000rpm?

 

If so, then there is a decent chance that you have an air-bubble in your cooling system - the 4AGE throttle body has a wax pellet in it which is heated by the coolant, and acts as a cold idler. When the car is cold, the coolant is cold and the pellet is solid, opening a valve to let extra air through the throttle, thus bumping the idle up to ~2000rpm. As the coolant warms up with the engine, the pellet melts and pushes the valve closed, dropping the idle back down to the normal set value. If you have an air-bubble in the system, the pellet does not get proper contact with the coolant and thus the valve will jump around between open and closed, which explains why the idle will switch from normal to high and back again in a seemingly random manner.

 

Easy to fix though, just jack the front end of the car up, open the radiator cap and bleed the cooling system (just run the car with the cap off, and try and massage the cooling lines towards the radiator to try and force the air bubble out. If that doesn't work, duct-tape a coke bottle to the radiator filler neck with the bottom cut off, and add some coolant/water to bump up the hydraulic head in the cooling system and push the bubbles out).