Revs Dropping When Approching Junctions

[stu_C]

Afternoon Guys

hopefully you can help me with a quick issue, our 2003 RAV4 drives absolutey fine but when approaching junctions/roundabouts when slowing down the Revs seem to drop and the engine cut out, also have one other issue that is seems like it takes a little while longer to start that I would expect I dont know if these two symptoms are related wondered if its the EGR valve or something?

[gjnorthall]

You don't mention petrol or diesel. If petrol then the usual problem causing your symptoms is a dirty idle control valve / throttle body - seems to start giving problems at 70 - 80 k miles. Theres a detailed cleaning method if you search this forum.

[stu_C]

Sorry mate it's a petrol :)

[Raistlin]

Open the bonnet of the RAV4. If the Toyota has recently been driven, allow a half hour for components to properly cool. Locate the IAC valve. The valve is found mounted on the throttle body. The valve unit looks like a 4-inch cylinder. Refer to the vehicle's repair manual for a diagram if needed.

Unplug the wire harness on the right side of the valve. Depress the harness tab and pull it straight out. Place the wire harness to the side to avoid damage during the cleaning process.

Loosen and remove the bolts that secure the valve to the throttle body. Place the bolts in a safe spot. Remove the valve from the mount.

Turn the valve upside down to access the two chambers. One chamber houses the valve spring and the other chamber houses the valve sensor. Spray electrical parts cleaner liberally into each opening.

Hold the valve over a rag or small bowl. Allow the cleaner to drain out the opposite side of the valve. Continue this process until the liquid draining out of the unit is clear.

Place the valve on a towel and allow tit to air dry completely. Reinstall the valve into the RAV4. Align the valve onto the mount. Replace the two bolts and secure them. Plug the wire harness back into the right side of the valve. Close the bonnet.

[gjnorthall]

Your engine is rather different to that shown in the video and the throttle body isn't as accessible. The screws retaining the idle valve can be very tight and the heads are soft and easily damaged. It makes life a lot easier if the throttle body is removed complete - it's quicker than fumbling about removing and refitting the ICV in situ. Before removing the ICV screws - give the heads a sharp knock to break the seal and ensure the screwdriver is a good fit - it can be quite difficult to remove the screws if the heads become damaged. The throttle body is easier to clean when removed and avoids the cleaning solvent and muck landing in the inlet manifold. Suggest replacing the ICV gasket and the TB gasket as well as the 3 ICV retaining screws - about £15 total. As soon as the inlet hose is removed from the TB - stuff a rag into the open end of the TB - otherwise you wouldn't be the first to drop something and it ends up in the manifold!

There's an excellent description of the job here

http://www.toyotaownersclub.com/forums/topic/128068-2000-toyota-rav42-1azfe-throttle-body-and-icv-idle-control-valve-cleaning-diy/