![]() ![]() First turn the TPS clockwise (away from the electrical connector) until it stops. Loosen the TPS adjustment screws holding it to the throttle body. If these are incorrect, then adjust as below. There should be a click from the TPS when the throttle is closed. There should be no click from the Throttle Position Switch on the rear side of the throttle body when the throttle is closed. Switch off the engine and tighten the lock nut while holding the adjustment screw so it doesn't turn.Ĭheck the gap between the adjustment screw and the throttle lever with a feeler gauge. Start the engine and turn the adjustment screw until idle is 480-520 rpm. On the front side of your throttle body, there is an adjustment screw. If idle speed does not drop, adjust as below. Pinch off the hose between the air intake and the IAC valve (don't damage the hose with something sharp!) Idle speed should drop below 500 rpm, or the engine may stop: both are normal. Checking the Throttle Body (Plate and Throttle Position Switch) AdjustmentĬonnect an accurate tachometer then warm up the engine. ![]() To achieve the above spec, adjust the throttle link rod (ball-socketed connection rod between drum and throttle lever)Ģ. (This is the adjustment screw that mounts on the throttle lever, not the adjustment of the larger nut that attaches the lever to the throttle plate shaft). Ĭleaning the Throttle Body: See the discussion in Engine:Performance for more informationĮnsure that when the cable drum is pushed off its endstop with a 2.5 mm feeler blade, the gap between throttle lever and adjustment screw is from 0.1 and 0.45 mm. Setting Base Idle Specs and TPS on Bosch LH2.4-Equipped Cars. A scanned copy of the Volvo Regina green book is here. Buy only the Regina-specific unit which is usually more expensive.
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