{"product_id":"wm388-genuine-williams-controls®-throttle-control-valve","title":"WM388 | Genuine Williams Controls® Throttle Control Valve","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003cbr\u003e\u003c\/strong\u003eA Throttle Control Valve \u003cstrong\u003eWM388 \u003c\/strong\u003eis a component in a vehicle’s air intake system that regulates the amount of air entering the engine. It is a key part of the engine’s air-fuel mixture control, which affects performance, fuel economy, and emissions.\u003cstrong\u003e\u003cbr\u003e\u003cbr\u003ePart Number: \u003c\/strong\u003eWM388\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: New\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eManufacture\/Brand\u003c\/strong\u003e\u003cspan\u003e: Williams Controls\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e \u003cstrong\u003eWM388\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"attrib\"\u003eMaximum Operating Pressure\u003c\/td\u003e\n\u003ctd\u003e150 psi (10.34 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"attrib\"\u003eModel\u003c\/td\u003e\n\u003ctd\u003eWM-388-U1C1D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"attrib\"\u003ePort\u003c\/td\u003e\n\u003ctd\u003e1\/4-18NPTF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong data-start=\"585\" data-end=\"597\"\u003e\u003c\/strong\u003e\u003cstrong data-start=\"585\" data-end=\"597\"\u003ePurpose of using WM388\u003c\/strong\u003e\u003cstrong data-start=\"585\" data-end=\"597\"\u003e:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp data-start=\"417\" data-end=\"452\"\u003e\u003cstrong data-start=\"421\" data-end=\"452\"\u003e1. Regulates Engine Airflow\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"453\" data-end=\"587\"\u003e\n\u003cli data-start=\"453\" data-end=\"516\"\u003e\n\u003cp data-start=\"455\" data-end=\"516\"\u003eControls the \u003cstrong data-start=\"468\" data-end=\"485\"\u003evolume of air\u003c\/strong\u003e entering the intake manifold\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"517\" data-end=\"587\"\u003e\n\u003cp data-start=\"519\" data-end=\"587\"\u003eWorks with fuel injectors to maintain the \u003cstrong data-start=\"561\" data-end=\"587\"\u003ecorrect air-fuel ratio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"589\" data-end=\"631\"\u003e\u003cstrong data-start=\"593\" data-end=\"631\"\u003e2. Controls Engine Power and Speed\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"632\" data-end=\"761\"\u003e\n\u003cli data-start=\"632\" data-end=\"667\"\u003e\n\u003cp data-start=\"634\" data-end=\"667\"\u003eOpens more for \u003cstrong data-start=\"649\" data-end=\"665\"\u003eacceleration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"668\" data-end=\"700\"\u003e\n\u003cp data-start=\"670\" data-end=\"700\"\u003eCloses partially at \u003cstrong data-start=\"690\" data-end=\"698\"\u003eidle\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"701\" data-end=\"761\"\u003e\n\u003cp data-start=\"703\" data-end=\"761\"\u003eProvides smooth engine response to the accelerator pedal\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"763\" data-end=\"798\"\u003e\u003cstrong data-start=\"767\" data-end=\"798\"\u003e3. Supports Fuel Efficiency\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"799\" data-end=\"895\"\u003e\n\u003cli data-start=\"799\" data-end=\"836\"\u003e\n\u003cp data-start=\"801\" data-end=\"836\"\u003eHelps maintain optimal combustion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"837\" data-end=\"895\"\u003e\n\u003cp data-start=\"839\" data-end=\"895\"\u003ePrevents wasting fuel by controlling airflow precisely\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"897\" data-end=\"925\"\u003e\u003cstrong data-start=\"901\" data-end=\"925\"\u003e4. Reduces Emissions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"926\" data-end=\"1038\"\u003e\n\u003cli data-start=\"926\" data-end=\"963\"\u003e\n\u003cp data-start=\"928\" data-end=\"963\"\u003eMaintains proper air-fuel mixture\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"964\" data-end=\"1038\"\u003e\n\u003cp data-start=\"966\" data-end=\"1038\"\u003eWorks with sensors and the ECM to minimize \u003cstrong data-start=\"1009\" data-end=\"1038\"\u003eCO, NOx, and hydrocarbons\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1040\" data-end=\"1089\"\u003e\u003cstrong data-start=\"1044\" data-end=\"1089\"\u003e5. Works With Engine Control Module (ECM)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1090\" data-end=\"1324\"\u003e\n\u003cli data-start=\"1090\" data-end=\"1191\"\u003e\n\u003cp data-start=\"1092\" data-end=\"1191\"\u003eIn modern vehicles, the throttle valve is usually \u003cstrong data-start=\"1142\" data-end=\"1171\"\u003eelectronically controlled\u003c\/strong\u003e (“drive-by-wire”)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1192\" data-end=\"1324\"\u003e\n\u003cp data-start=\"1194\" data-end=\"1225\"\u003eECM adjusts the valve based on:\u003c\/p\u003e\n\u003cul data-start=\"1228\" data-end=\"1324\"\u003e\n\u003cli data-start=\"1228\" data-end=\"1258\"\u003e\n\u003cp data-start=\"1230\" data-end=\"1258\"\u003eAccelerator pedal position\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1261\" data-end=\"1276\"\u003e\n\u003cp data-start=\"1263\" data-end=\"1276\"\u003eEngine load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1279\" data-end=\"1294\"\u003e\n\u003cp data-start=\"1281\" data-end=\"1294\"\u003eTemperature\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1297\" data-end=\"1324\"\u003e\n\u003cp data-start=\"1299\" data-end=\"1324\"\u003eAirflow sensor readings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of a Bad Throttle Control Valve WM388\u003cspan\u003e:\u003c\/span\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp data-start=\"136\" data-end=\"180\"\u003e\u003cstrong data-start=\"140\" data-end=\"180\"\u003e1. Check Engine Light (CEL) Turns On\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"181\" data-end=\"280\"\u003e\n\u003cli data-start=\"181\" data-end=\"206\"\u003e\n\u003cp data-start=\"183\" data-end=\"206\"\u003eMost common indicator\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"207\" data-end=\"280\"\u003e\n\u003cp data-start=\"209\" data-end=\"280\"\u003eECM stores \u003cstrong data-start=\"220\" data-end=\"246\"\u003ethrottle-related codes\u003c\/strong\u003e (like P0120–P0124, P2100–P2119)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"287\" data-end=\"321\"\u003e\u003cstrong data-start=\"291\" data-end=\"321\"\u003e2. Poor Engine Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"322\" data-end=\"412\"\u003e\n\u003cli data-start=\"322\" data-end=\"365\"\u003e\n\u003cp data-start=\"324\" data-end=\"365\"\u003eEngine \u003cstrong data-start=\"331\" data-end=\"363\"\u003ehesitates, stalls, or surges\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"366\" data-end=\"412\"\u003e\n\u003cp data-start=\"368\" data-end=\"412\"\u003eReduced \u003cstrong data-start=\"376\" data-end=\"392\"\u003eacceleration\u003c\/strong\u003e or \u003cstrong data-start=\"396\" data-end=\"410\"\u003epower loss\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"419\" data-end=\"457\"\u003e\u003cstrong data-start=\"423\" data-end=\"457\"\u003e3. Rough or High\/Unstable Idle\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"458\" data-end=\"589\"\u003e\n\u003cli data-start=\"458\" data-end=\"517\"\u003e\n\u003cp data-start=\"460\" data-end=\"517\"\u003eEngine \u003cstrong data-start=\"467\" data-end=\"488\"\u003eidles erratically\u003c\/strong\u003e or \u003cstrong data-start=\"492\" data-end=\"515\"\u003erevves unexpectedly\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"518\" data-end=\"589\"\u003e\n\u003cp data-start=\"520\" data-end=\"589\"\u003eIdle may \u003cstrong data-start=\"529\" data-end=\"554\"\u003efluctuate up and down\u003c\/strong\u003e without pressing the accelerator\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"596\" data-end=\"639\"\u003e\u003cstrong data-start=\"600\" data-end=\"639\"\u003e4. Throttle Lag or Delayed Response\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"640\" data-end=\"749\"\u003e\n\u003cli data-start=\"640\" data-end=\"693\"\u003e\n\u003cp data-start=\"642\" data-end=\"693\"\u003eSlow response when pressing the accelerator pedal\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"694\" data-end=\"749\"\u003e\n\u003cp data-start=\"696\" data-end=\"749\"\u003eCan feel like \u003cstrong data-start=\"710\" data-end=\"727\"\u003eengine “lags”\u003c\/strong\u003e before accelerating\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"756\" data-end=\"787\"\u003e\u003cstrong data-start=\"760\" data-end=\"787\"\u003e5. Limp Mode Activation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"788\" data-end=\"892\"\u003e\n\u003cli data-start=\"788\" data-end=\"847\"\u003e\n\u003cp data-start=\"790\" data-end=\"847\"\u003eSome vehicles enter \u003cstrong data-start=\"810\" data-end=\"823\"\u003elimp mode\u003c\/strong\u003e to protect the engine\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"848\" data-end=\"892\"\u003e\n\u003cp data-start=\"850\" data-end=\"892\"\u003eLimits speed and power to prevent damage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"899\" data-end=\"918\"\u003e\u003cstrong data-start=\"903\" data-end=\"918\"\u003e6. Stalling\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"919\" data-end=\"987\"\u003e\n\u003cli data-start=\"919\" data-end=\"987\"\u003e\n\u003cp data-start=\"921\" data-end=\"987\"\u003eEngine may \u003cstrong data-start=\"932\" data-end=\"955\"\u003estall at stoplights\u003c\/strong\u003e or during low-speed maneuvers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"994\" data-end=\"1022\"\u003e\u003cstrong data-start=\"998\" data-end=\"1022\"\u003e7. Poor Fuel Economy\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1023\" data-end=\"1154\"\u003e\n\u003cli data-start=\"1023\" data-end=\"1110\"\u003e\n\u003cp data-start=\"1025\" data-end=\"1110\"\u003eIncorrect throttle positioning can cause the engine to run \u003cstrong data-start=\"1084\" data-end=\"1108\"\u003etoo rich or too lean\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1111\" data-end=\"1154\"\u003e\n\u003cp data-start=\"1113\" data-end=\"1154\"\u003eLeads to \u003cstrong data-start=\"1122\" data-end=\"1152\"\u003eincreased fuel consumption\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1161\" data-end=\"1208\"\u003e\u003cstrong data-start=\"1165\" data-end=\"1208\"\u003e8. Reduced Power or “Engine Hesitation”\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1209\" data-end=\"1292\"\u003e\n\u003cli data-start=\"1209\" data-end=\"1236\"\u003e\n\u003cp data-start=\"1211\" data-end=\"1236\"\u003eDifficulty accelerating\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1237\" data-end=\"1292\"\u003e\n\u003cp data-start=\"1239\" data-end=\"1292\"\u003eEngine may \u003cstrong data-start=\"1250\" data-end=\"1272\"\u003esurge unexpectedly\u003c\/strong\u003e at constant speed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"97\" data-end=\"476\"\u003e\u003cstrong data-start=\"97\" data-end=\"151\"\u003eAbout the Manufacturer – Williams Controls\u003c\/strong\u003e\u003cstrong data-start=\"97\" data-end=\"151\"\u003e:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"539\" data-start=\"196\"\u003e\u003cstrong data-end=\"66\" data-start=\"45\"\u003eWilliams Controls\u003c\/strong\u003e is a trusted manufacturer of vehicle control systems, specializing in throttle controls, sensors, pedals, and other precision components for heavy trucks, buses, off-highway, and specialty vehicles. Founded in 1937 and now part of Curtiss‑Wright, the brand is known for rugged, reliable, and high-performance solutions that ensure safe and efficient operation in demanding conditions.\u003c\/p\u003e","brand":"Williams Controls","offers":[{"title":"Default Title","offer_id":50344480571639,"sku":"WM388","price":489.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/A1297B3_01.jpg?v=1765310457","url":"https:\/\/forcetruckparts.com\/products\/wm388-genuine-williams-controls%c2%ae-throttle-control-valve","provider":"Force Truck Parts","version":"1.0","type":"link"}