Possible Symptoms and Conditions:

Possible causes

Idle hunt occurs at all times Idle hunt occurs at random/intermittent times Idle hunt occurs only when the engine is cold Idle hunt occurs only when the engine is warm Idle hunt occurs only with full throttle applied Idle hunt occurs only with no throttle applied Idle hunt occurs only with part throttle applied Idle hunt occurs only as or after the engine is started Idle hunt occurs only as or after the engine is turned off Idle hunt occurs only when braking Idle hunt occurs only when accelerating Idle hunt occurs only when cruising Idle hunt occurs only in gear Idle hunt occurs only out of gear Idle hunt occurs only when changing gears Idle hunt occurs only at high speeds Idle hunt occurs only at low speeds Idle hunt occurs only driving over bumps Idle hunt occurs only during rain Idle hunt occurs only with the A/C on Idle hunt occurs only with the A/C off Idle hunt occurs only in cold weather Idle hunt occurs only while using cruise control Idle hunt Idle surge/fluctuation occurs at all times Idle surge/fluctuation occurs at random/intermittent times Idle surge/fluctuation occurs only when the engine is cold Idle surge/fluctuation occurs only when the engine is warm Idle surge/fluctuation occurs only with full throttle applied Idle surge/fluctuation occurs only with no throttle applied Idle surge/fluctuation occurs only with part throttle applied Idle surge/fluctuation occurs only as or after the engine is started Idle surge/fluctuation occurs only as or after the engine is turned off Idle surge/fluctuation occurs only when braking Idle surge/fluctuation occurs only when accelerating Idle surge/fluctuation occurs only when cruising Idle surge/fluctuation occurs only in gear Idle surge/fluctuation occurs only out of gear Idle surge/fluctuation occurs only when changing gears Idle surge/fluctuation occurs only at high speeds Idle surge/fluctuation occurs only at low speeds Idle surge/fluctuation occurs only driving over bumps Idle surge/fluctuation occurs only during rain Idle surge/fluctuation occurs only with the A/C on Idle surge/fluctuation occurs only with the A/C off Idle surge/fluctuation occurs only in cold weather Idle surge/fluctuation occurs only while using cruise control Idle surge/fluctuation High idle Low idle occurs at all times Low idle occurs at random/intermittent times Low idle occurs only when the engine is cold Low idle occurs only when the engine is warm Low idle occurs only with full throttle applied Low idle occurs only with no throttle applied Low idle occurs only with part throttle applied Low idle occurs only as or after the engine is started Low idle occurs only as or after the engine is turned off Low idle occurs only when braking Low idle occurs only when accelerating Low idle occurs only when cruising Low idle occurs only in gear Low idle occurs only out of gear Low idle occurs only when changing gears Low idle occurs only at high speeds Low idle occurs only at low speeds Low idle occurs only driving over bumps Low idle occurs only during rain Low idle occurs only with the A/C on Low idle occurs only with the A/C off Low idle occurs only in cold weather Low idle occurs only while using cruise control Low idle No start occurs at all times No start occurs at random/intermittent times No start occurs only when the engine is cold No start occurs only when the engine is warm No start occurs only with full throttle applied No start occurs only with no throttle applied No start occurs only with part throttle applied No start occurs only as or after the engine is started No start occurs only as or after the engine is turned off No start occurs only when braking No start occurs only when accelerating No start occurs only when cruising No start occurs only in gear No start occurs only out of gear No start occurs only when changing gears No start occurs only at high speeds No start occurs only at low speeds No start occurs only driving over bumps No start occurs only during rain No start occurs only with the A/C on No start occurs only with the A/C off No start occurs only in cold weather No start occurs only while using cruise control No start Hard start Starter will not disengage Rich mixture Lean mixture Loping Stalling Misfiring Hesitation/stumble Surge Cut-out Poor acceleration Loss of power Backfire Engine run-on/dieseling Engine overheats Engine warms up very slowly Transmission slips/engine revs without acceleration Backfiring sounds Banging sounds Beeping sounds Blowing sounds Booming sounds Bubbling sounds Buzzing sounds Chatter sounds Chirping sounds Clacking sounds Clanking sounds Clicking sounds Clunking sounds Creaking sounds Crackling sounds Crunching sounds Droning sounds Dripping sounds Exploding sounds Flapping sounds occur at all times Flapping sounds occur at random/intermittent times Flapping sounds occur only when the engine is cold Flapping sounds occur only when the engine is warm Flapping sounds occur only with full throttle applied Flapping sounds occur only with no throttle applied Flapping sounds occur only with part throttle applied Flapping sounds occur only as or after the engine is started Flapping sounds occur only as or after the engine is turned off Flapping sounds occur only when braking Flapping sounds occur only when accelerating Flapping sounds occur only when cruising Flapping sounds occur only in gear Flapping sounds occur only out of gear Flapping sounds occur only when changing gears Flapping sounds occur only at high speeds Flapping sounds occur only at low speeds Flapping sounds occur only driving over bumps Flapping sounds occur only during rain Flapping sounds occur only with the A/C on Flapping sounds occur only with the A/C off Flapping sounds occur only in cold weather Flapping sounds occur only while using cruise control Flapping sounds Fizzing sounds Grinding sounds Groaning sounds Growling sounds Gurgling sounds Hissing sounds Humming sounds Moaning sounds Overly loud exhaust sounds Pinging sounds Popping sounds Puffing sounds Rattling sounds Rumbling sounds Rustling sounds Ripping sounds Scraping sounds Scratching sounds Screeching sounds Slapping sounds Sloshing sounds Snapping sounds Sputtering sounds Squeaking sounds Squealing sounds occur at all times Squealing sounds occur at random/intermittent times Squealing sounds occur only when the engine is cold Squealing sounds occur only when the engine is warm Squealing sounds occur only with full throttle applied Squealing sounds occur only with no throttle applied Squealing sounds occur only with part throttle applied Squealing sounds occur only as or after the engine is started Squealing sounds occur only as or after the engine is turned off Squealing sounds occur only when braking Squealing sounds occur only when accelerating Squealing sounds occur only when cruising Squealing sounds occur only in gear Squealing sounds occur only when changing gears Squealing sounds occur only at high speeds Squealing sounds occur only at low speeds Squealing sounds occur only driving over bumps Squealing sounds occur only during rain Squealing sounds occur only with the A/C on Squealing sounds occur only with the A/C off Squealing sounds occur only in cold weather Squealing sounds occur only while using cruise control Squealing sounds are heard from the front of the vehicle Squealing sounds are heard from the rear of the vehicle Squealing sounds are heard from the interior of the vehicle Squealing sounds are heard from the dash Squealing sounds are heard from the shifter Squealing sounds are heard from the engine Squealing sounds are heard from the transmission Squealing sounds are heard from the drivetrain Squealing sounds are heard from the wheels Squealing sounds are heard from the suspension Squealing sounds are heard from the exhaust Squealing sounds Tapping sounds occur at all times Tapping sounds occur at random/intermittent times Tapping sounds occur only when the engine is cold Tapping sounds occur only when the engine is warm Tapping sounds occur only with full throttle applied Tapping sounds occur only with no throttle applied Tapping sounds occur only with part throttle applied Tapping sounds occur only as or after the engine is started Tapping sounds occur only as or after the engine is turned off Tapping sounds occur only when braking Tapping sounds occur only when accelerating Tapping sounds occur only when cruising Tapping sounds occur only in gear Tapping sounds occur only out of gear Tapping sounds occur only when changing gears Tapping sounds occur only at high speeds Tapping sounds occur only at low speeds Tapping sounds occur only driving over bumps Tapping sounds occur only during rain Tapping sounds occur only with the A/C on Tapping sounds occur only with the A/C off Tapping sounds occur only in cold weather Tapping sounds occur only while using cruise control Tapping sounds Thumping sounds Ticking sounds Whirring sounds Whistling sounds Vibration felt Less than normal play/effort required More than normal play/effort required Lurching/Bucking felt Shaking felt Chatter/pulsation felt Veering/drifting felt Pulling felt through the shifter Pulling felt through the gas pedal Pulling felt through the entire vehicle Pulling felt through the brake pedal Pulling felt through the clutch pedal Pulling felt through the steering wheel Pulling felt through the seat Pulling felt Grabbing felt at all times Grabbing felt at random/intermittent times Grabbing felt only when the engine is cold Grabbing felt only when the engine is warm Grabbing felt only with full throttle applied Grabbing felt only with no throttle applied Grabbing felt only with part throttle applied Grabbing felt only as or after the engine is started Grabbing felt only as or after the engine is turned off Grabbing felt only when braking Grabbing felt only when accelerating Grabbing felt only when cruising Grabbing felt only in gear Grabbing felt only out of gear Grabbing felt only when changing gears Grabbing felt only at high speeds Grabbing felt only at low speeds Grabbing felt only driving over bumps Grabbing felt only during rain Grabbing felt only with the A/C on Grabbing felt only with the A/C off Grabbing felt only in cold weather Grabbing felt only while using cruise control Grabbing felt Bouncing felt Bottoming out felt Dragging felt Fuel smell Rotten Eggs smell Sulfur smell at random/intermittent times Sulfur smell only when the engine is cold Sulfur smell at all times Sulfur smell only when the engine is warm Sulfur smell only with full throttle applied Sulfur smell only with no throttle applied Sulfur smell only with part throttle applied Sulfur smell only as or after the engine is started Sulfur smell only as or after the engine is turned off Sulfur smell only when braking Sulfur smell only when accelerating Sulfur smell only when cruising Sulfur smell only in gear Sulfur smell only out of gear Sulfur smell only when changing gears Sulfur smell only at high speeds Sulfur smell only at low speeds Sulfur smell only driving over bumps Sulfur smell only during rain Sulfur smell only with the A/C on Sulfur smell only with the A/C off Sulfur smell only in cold weather Sulfur smell only while using cruise control Sulfur smell Oil smell Propane/natural gas smell Vinegar smell Burning plastic smell Burning rubber smell Burning smell Sweet smell Grey smoke seen White smoke seen at all times White smoke seen at random/intermittent times White smoke seen only when the engine is cold White smoke seen only when the engine is warm White smoke seen only with full throttle applied White smoke seen only with no throttle applied White smoke seen only with part throttle applied White smoke seen only as or after the engine is started White smoke seen only as or after the engine is turned off White smoke seen only when braking White smoke seen only when accelerating White smoke seen only when cruising White smoke seen only in gear White smoke seen only out of gear White smoke seen only when changing gears White smoke seen only at high speeds White smoke seen only at low speeds White smoke seen only driving over bumps White smoke seen only during rain White smoke seen only with the A/C on White smoke seen only with the A/C off White smoke seen only in cold weather White smoke seen only while using cruise control White smoke seen on the dash White smoke seen comes from the engine White smoke seen comes from the exhaust White smoke seen comes from the transmission White smoke seen comes from the wheels White smoke seen as a headlight out White smoke seen as a tail light out White smoke seen Black smoke seen at all times Black smoke seen at random/intermittent times Black smoke seen only when the engine is cold Black smoke seen only when the engine is warm Black smoke seen only with full throttle applied Black smoke seen only with part throttle applied Black smoke seen only as or after the engine is started Black smoke seen only as or after the engine is turned off Black smoke seen only when braking Black smoke seen only when accelerating Black smoke seen only when cruising Black smoke seen only in gear Black smoke seen only out of gear Black smoke seen only when changing gears Black smoke seen only at high speeds Black smoke seen only at low speeds Black smoke seen only driving over bumps Black smoke seen only during rain Black smoke seen only with the A/C on Black smoke seen only with the A/C off Black smoke seen only in cold weather Black smoke seen only while using cruise control Black smoke seen on the dash Black smoke seen comes from the engine Black smoke seen comes from the exhaust Black smoke seen comes from the transmission Black smoke seen comes from the wheels Black smoke seen as a headlight out Black smoke seen as a tail light out Black smoke seen Blue smoke seen at all times Blue smoke seen at random/intermittent times Blue smoke seen only when the engine is cold Blue smoke seen only when the engine is warm Blue smoke seen only with full throttle applied Blue smoke seen only with no throttle applied Blue smoke seen only with part throttle applied Blue smoke seen only as or after the engine is started Blue smoke seen only as or after the engine is turned off Blue smoke seen only when braking Blue smoke seen only when accelerating Blue smoke seen only when cruising Blue smoke seen only in gear Blue smoke seen only out of gear Blue smoke seen only when changing gears Blue smoke seen only at high speeds Blue smoke seen only at low speeds Blue smoke seen only driving over bumps Blue smoke seen only during rain Blue smoke seen only with the A/C on Blue smoke seen only with the A/C off Blue smoke seen only in cold weather Blue smoke seen only while using cruise control Blue smoke seen on the dash Blue smoke seen comes from the engine Blue smoke seen comes from the exhaust Blue smoke seen comes from the transmission Blue smoke seen comes from the wheels Blue smoke seen as a headlight out Blue smoke seen as a tail light out Blue smoke seen Check engine light seen at all times Check engine light seen at random/intermittent times Check engine light seen only when the engine is cold Check engine light seen only when the engine is warm Check engine light seen only with full throttle applied Check engine light seen only with no throttle applied Check engine light seen only with part throttle applied Check engine light seen only as or after the engine is started Check engine light seen only as or after the engine is turned off Check engine light seen only when braking Check engine light seen only when accelerating Check engine light seen only when cruising Check engine light seen only in gear Check engine light seen only out of gear Check engine light seen only when changing gears Check engine light seen only at high speeds Check engine light seen only at low speeds Check engine light seen only driving over bumps Check engine light seen only during rain Check engine light seen only with the A/C on Check engine light seen only with the A/C off Check engine light seen only in cold weather Check engine light seen only while using cruise control Check engine light seen on the dash Check engine light seen comes from the engine Check engine light seen comes from the exhaust Check engine light seen comes from the transmission Check engine light seen comes from the wheels Check engine light seen as a headlight out Check engine light seen as a tail light out Check engine light seen Brakes/ABS indicator seen at all times Brakes/ABS indicator seen at random/intermittent times Brakes/ABS indicator seen only when the engine is cold Brakes/ABS indicator seen only when the engine is warm Brakes/ABS indicator seen only with full throttle applied Brakes/ABS indicator seen only with no throttle applied Brakes/ABS indicator seen only with part throttle applied Brakes/ABS indicator seen only as or after the engine is started Brakes/ABS indicator seen only as or after the engine is turned off Brakes/ABS indicator seen only when braking Brakes/ABS indicator seen only when accelerating Brakes/ABS indicator seen only when cruising Brakes/ABS indicator seen only in gear Brakes/ABS indicator seen only out of gear Brakes/ABS indicator seen only when changing gears Brakes/ABS indicator seen only at high speeds Brakes/ABS indicator seen only at low speeds Brakes/ABS indicator seen only driving over bumps Brakes/ABS indicator seen only during rain Brakes/ABS indicator seen only with the A/C on Brakes/ABS indicator seen only with the A/C off Brakes/ABS indicator seen only in cold weather Brakes/ABS indicator seen comes from the engine Brakes/ABS indicator seen comes from the exhaust Brakes/ABS indicator seen comes from the wheels Brakes/ABS indicator seen as a tail light out Brakes/ABS indicator seen Battery indicator seen at all times Battery indicator seen at random/intermittent times Battery indicator seen only when the engine is cold Battery indicator seen only when the engine is warm Battery indicator seen only with full throttle applied Battery indicator seen only with no throttle applied Battery indicator seen only as or after the engine is started Battery indicator seen only as or after the engine is turned off Battery indicator seen only when braking Battery indicator seen only when accelerating Battery indicator seen only when cruising Battery indicator seen only in gear Battery indicator seen only when changing gears Battery indicator seen only at high speeds Battery indicator seen only at low speeds Battery indicator seen only during rain Battery indicator seen only with the A/C on Battery indicator seen only with the A/C off Battery indicator seen only in cold weather Battery indicator seen only while using cruise control Battery indicator seen on the dash Battery indicator seen comes from the engine Battery indicator seen comes from the exhaust Battery indicator seen comes from the transmission Battery indicator seen comes from the wheels Battery indicator seen as a headlight out Battery indicator seen as a tail light out Battery indicator seen SRS/airbag indicator seen at all times SRS/airbag indicator seen at random/intermittent times SRS/airbag indicator seen only when the engine is cold SRS/airbag indicator seen only when the engine is warm SRS/airbag indicator seen only with full throttle applied SRS/airbag indicator seen only with no throttle applied SRS/airbag indicator seen only with part throttle applied SRS/airbag indicator seen only as or after the engine is started SRS/airbag indicator seen only as or after the engine is turned off SRS/airbag indicator seen only when braking SRS/airbag indicator seen only when accelerating SRS/airbag indicator seen only when cruising SRS/airbag indicator seen only in gear SRS/airbag indicator seen only out of gear SRS/airbag indicator seen only when changing gears SRS/airbag indicator seen only at high speeds SRS/airbag indicator seen only at low speeds SRS/airbag indicator seen only driving over bumps SRS/airbag indicator seen only during rain SRS/airbag indicator seen only with the A/C on SRS/airbag indicator seen only with the A/C off SRS/airbag indicator seen only in cold weather SRS/airbag indicator seen only while using cruise control SRS/airbag indicator seen on the dash SRS/airbag indicator seen comes from the engine SRS/airbag indicator seen comes from the exhaust SRS/airbag indicator seen comes from the transmission SRS/airbag indicator seen comes from the wheels SRS/airbag indicator seen as a headlight out SRS/airbag indicator seen as a tail light out SRS/airbag indicator seen Lights out seen at all times Lights out seen at random/intermittent times Lights out seen only when the engine is cold Lights out seen only when the engine is warm Lights out seen only with full throttle applied Lights out seen only with no throttle applied Lights out seen only with part throttle applied Lights out seen only as or after the engine is started Lights out seen only as or after the engine is turned off Lights out seen only when braking Lights out seen only when accelerating Lights out seen only when cruising Lights out seen only in gear Lights out seen only out of gear Lights out seen only when changing gears Lights out seen only at high speeds Lights out seen only at low speeds Lights out seen only driving over bumps Lights out seen only during rain Lights out seen only with the A/C on Lights out seen only with the A/C off Lights out seen only in cold weather Lights out seen only while using cruise control Lights out seen on the dash

Inspect air filter Inspect EGR system Inspect electrical wiring and computer systems Inspect fuel injection system Inspect idle speed control system Inspect ignition system Inspect MAF sensor Inspect MAP sensor Inspect O2 sensor Inspect PCV system Inspect throttle body Inspect throttle position sensor Check for vacuum leaks Inspect alternator Inspect battery Inspect exhaust system Check for lack of fuel Inspect starter Inspect cooling system Inspect belts and pulleys Inspect brakes system Inspect thermostat Inspect transmission fluid Inspect clutch Inspect torque converter Inspect valvetrain assembly Inspect control arm assembly Inspect connecting rod assemblies Inspect crankshaft Inspect engine lubrication system Inspect brake pad retainers Inspect stabilizer bar assemblies Inspect transmission mounts Inspect transmission Inspect differential mounts Inspect engine mounts Check for carbon buildup Check for bad fuel Inspect engine oil Inspect tires Inspect head gasket Inspect cv joints Inspect pistons Inspect strut assemblies Inspect shocks Inspect springs Inspect frame Inspect ball joints Inspect tie rod assemblies Inspect brake pads Inspect brake rotors Inspect axles Check for exhaust leaks Inspect suspension system Check for weather-stripping leaks Check for coolant leaks Inspect transmission water pump Inspect fluids Inspect HVAC system Inspect fans Inspect power steering system Inspect stereo system Inspect sway bar assemblies Inspect window regulators, motors, and arms Inspect power steering fluid Inspect wheel bearings Inspect brake calipers Inspect differential Inspect syncromesh assembly Inspect exhaust gaskets Inspect driveshaft assembly Inspect balance rods Inspect rims Check wheel balance Inspect transmission bushings Inspect u-joints Inspect cruise control actuator Inspect throttle linkage Inspect brake drums Inspect lug nuts Inspect flywheel Inspect clutch bearing Inspect clutch plate Inspect main drive gear Inspect clutch pedal linkage Check wheel alignment Inspect fuel injectors Inspect fuel pressure regulator Inspect fuel lines Inspect gas cap Inspect cylinder head Inspect brake master cylinder Inspect brake booster Inspect piston rings Inspect valve guides Inspect valve seals Check for OBD trouble codes Inspect fuses and relays