ZEST BOLT Service Manual

Revotron 1.2T 13 Poor acceleration or low power Insufficient battery voltage/charge - test battery and charging system • Clean and tighten battery connections • Battery or charging system component faulty. Replace as necessary. Obstructed air filter or air inlet • Clean or replace air filter or inlet. Disconnected or leaking vacuum line or vacuum leak at inlet manifold • Inspect all vacuum lines and inlet manifold. Repair or replace as necessary. Improper grade or contaminated fuel • Flush fuel system with fresh, clean, fuel of the correct type. Replace fuel filter. Improper valve tappet clearances • Check and adjust as necessary. Faulty spark plugs, wires, or ignition coil • Check ignition system components for proper operation. Replace as necessary. Malfunctioning engine management system component • Perform engine management system diagnostic test as described in this section of the manual. Defective Engine Control Unit (ECU) • Replace as necessary. Malfunctioning emissions system component • Check tank pressure valve, purge canister valve, and charcoal canister. Repair or replace as necessary. Clogged or faulty fuel filter, fuel regulator, fuel line, or fuel pump • Check fuel system components, repair or replace as necessary. Clogged or faulty fuel injector(s) • Check fuel injector operation. Replace as necessary. Incorrect valve/ignition timing • Check timing system components and repair or replace as necessary. Improper firing order • Check ignition system and fuel injector connections. Rectify as necessary. Engine misfires Disconnected or leaking vacuum line or vacuum leak at inlet manifold • Inspect all vacuum lines and inlet manifold. Repair or replace as necessary. Improper grade or contaminated fuel • Rush fuel system with fresh, clean, fuel of the correct type. Replace fuel filter. Improper valve tappet clearances • Check and adjust as necessary. Faulty spark plugs, wires, or ignition coil • Check ignition system components for proper operation. Replace as necessary. Incorrect crank angle signal. • Check sensor gap and adjust to 1.4 ± 0.4mm Improper firing order • Check ignition system and fuel injector connections. Rectify as necessary. Clogged or faulty fuel injector(s) • Check fuel injector operation. Replace as necessary.