87 mr2 missfires on+off after 1hr running an idiles up an down randomly

Asked by lawsonwages Jan 30, 2016 at 07:31 PM about the 1987 Toyota MR2 STD Coupe

Question type: General

1 Answer
42,455

Auto_Centric answered 8 years ago

Toyota mr2 4age engine check your plug wires for arcing or use a volt ohm check resistance on each wire 4000ohms-15000ohms OK connect a vacuum gauge make sure its high and steady 18-20 AFM (air flow meter) – misfiring, dying right after it starts, bad gas mileage TPS (Throttle position sensor) – idle surging, high idle, gas bad mileage Idle Speed Control Valve on the throttle body – usually causes high idle Throttle body – usually causes high idle Vacuum/ intake gasket leak – usually causes misfiring and engine cutting off Ignition timing – usually causes misfiring

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