When sitting at a red light my Mazda 3 idles real funny...vibrating almost sounding like a cats purr?
2006 Mazda 3
Applies to 2006 Mazda Mazda3:
Available engines
4 Cylinders 2.0L MFI DOHC
4 Cylinders 2.3L MFI DOHC
Could be a number of things - you're going to end up checking the entire car.
Off the top of my head:
a) exhaust component has rusted loose (usually catalytic converter heat shield). Any loose exhaust component (hanger/muffler, etc.) will vibrate at idle.
b) glove compartment door - loose hinge
c) motor mount - rubber part of metal/rubber mount vibrates loose & falls out.
d) transmission mount - ditto.
The Maintenance manual for your car says:
Clicking noise at idle or driving
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1 Inspect Main (Crankshaft) Bearing - Excessive Bearing Clearance.
1 Inspect Rod Bearing - Incorrect Rod or Main Bearing Clearances.
2 Inspect Rocker Arm - Worn or Incorrectly Adjusted Rocker Arm(s).
3 Inspect Piston Ring Set - Worn or Broken Piston Rings.
4 Inspect Piston - Worn, Damaged, or Faulty Piston.
5 Inspect Fuel Line Assembly - Fuel Line Leaking.
6 Inspect Hose Clamp - Loose or Missing Fuel Line Clamps.
Tapping noise at idle
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1 Inspect Valve Lifter - Insufficient Oil Supply.
2 Inspect Fan Blade - Broken, Missing, or Faulty Fan Blade(s).
3 Inspect Oil Pump Screen - Clogged Oil Pump Screen.
4 Inspect Oil Pump Drive Gear - Damaged or Faulty Oil Pump Drive Gear.
5 Inspect Exhaust Valve(s) - Burned, Worn, or Sticking Exhaust Valves.
6 Inspect Oil(Crankcase)Capacity - Lifters Need Additional Lubrication.
7 Inspect Oil Filler Cap - Oil Filler Cap Damaged or Missing.
8 Inspect Oil Pump - Damaged or Faulty Oil Pump.
9 Inspect Oil Filter - Old or Clogged Oil Filter.
10 Inspect Oil FLow Check Valve - Damaged or Faulty Oil FLow Check Valve Caused Loss of Oil Pressure.
Vibration while Accelerating
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1 Inspect CV Half-Shaft (Remanufactured) CCT - Worn or Damaged CV Half-Shaft.
vibration while braking
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1 Inspect Brake Rotor - Warped or Uneven Brake Rotor Surface.
Vibration while driving - entire vehicle
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1 Inspect Brake Rotor Specs - Warped or Uneven Brake Rotor Surface.
2 Inspect Ball Joint-Lower - Worn, Damaged, or Faulty Ball Joint.
3 Inspect Ball Joint-UPPER - Worn, Damaged, or Faulty Ball Joint.
3 Inspect Wheel Bearing-Front - Worn, Dry or Damaged Wheel Bearing.
5 Inspect Tie Rod End - Worn or Damaged Tie Rod Ends.
6 Inspect Wheel Bearing-Rear - Worn, Dry or Damaged Wheel Bearing.
7 Inspect Wheel Hub Bearing - Worn, Dry or Damaged Wheel Hub Bearing.
Vibration in rear axle area while driving
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1 Inspect U-Joint - Loose, Worn, or Damaged U-Joint.
2 Inspect Driveshaft - Bent, Loose or Unbalanced Driveshaft.
4 Inspect Differential Drive Pinion - Worn, Damaged or Broken Pinion Teeth.
4 Inspect Wheel Bearing-Rear - Worn, Dry or Damaged Wheel Bearing.
5 Inspect Pinion Bearing - Worn or Damaged Pinion Bearings or Yolk Shaft.
Vibration in steering wheel while driving
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1 Inspect Wheel Bearing-Rear - Worn, Dry or Damaged Wheel Bearing.
Vibration in tire/wheel area while driving
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1 Inspect Wheel Bearing-Front - Incorrectly Tightened or Installed Wheel Bearing.
Vibration under vehicle while driving
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1 Inspect U-Joint - Loose, Worn, or Damaged U-Joint.
2 Inspect Muffler - Damaged or Burned Out Muffler.
Vibration in rear wheeel area while driving
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1 Inspect Wheel Bearing-Rear - Worn, Dry or Damaged Wheel Bearing.
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