Question about 1994 Toyota Land Cruiser
This sounds like you have an idle air control valve fault. When in park and neutral the engine is effectively disengaged from the 'drive' and is therefore not churning transmission fluid. When 'drive is engaged the torque converter is pushing fluid against a static impeller and this take effort from the engine. Ordinarily the ECU should compensate for the extra load imposed on the engine output by increasing the amount of air through the idle air control valve and by increasing the injection cycle by an equivalent amount. The potential good news is that the 'repair' may not cost you very much at all. Remove the air ducting between the air filter box and the throttle. With a cloth and WD40 or carb choke cleaner spray simply clean the throttle body interior of all oily residue. Clean the throttle plate and then rotate with finger pressure and clean as far as you can behind. There are two types of idle air control a) a motor opens the throttle plate by a tiny amount by acting on the end of the throttle plate shaft b) a valve controlled passage leads around the throttle plate which opens fractionally at idle. If your engine is the former type then the interior clean should be enough. If your engine is the latter locate the passageway leading off from the air duct side of the throttle plate and the return passage on the inlet plenum side of the throttle plate. This passageway needs to be clean. The valve that controls the air flow through this passage is held onto the throttle exterior by a couple of bolts and has an electrical connection to it. Disconnect and remove the valve. Clean it thoroughly and then reinstate everything as before. The above should help resolve the issue
Posted on Nov 11, 2010
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Posted on Jan 02, 2017
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