| Sound |
Description |
Diagnosis |
| Clicking |
Light,
sharp noise. Often related to vehicle speed |
Ofthe
caused by a loose or bent fan blade or stuck valve lifter. May be
indicative of low oil. |
| Clunking |
Thumping
or thudding sound |
Can
be attributed to a loos shock absorber of exhaust pipe. If thud
is rhythmic and increases with speed, check tires for damage. If
while shifting may be sign of bad motor mounts, bad CV or U joint,
or low transmission fluid. |
| Knocking |
Rhythmic
pounding |
Often
indicates worn connection rod bearings or crankshaft. Possibly loose
transmission torque converter |
| Pinging |
High
pitched tapping or rattling sound |
Usually
indicative of a problem with octane level in gasoline or a problem
with automotive timing. Older cars can have timing adjusted while
newer cars have timing controlled by on-board computer. |
| Screeching |
High
pitched piercing metallic sound |
When driving is likely due to brake wear sensors indicating replacement
necessary. When braking lightly it is usually a minor annoyance
treated with anti noise paste. Under heavy braking usually indicative
of needing new material brake pads.
|
| Squealing |
Loud
shrill, sharp, noise |
Loose
or worn belts (alternator, fan, timing, power steering, or A/C)
possible brake system issue (see Screeching). |
I have Renault Duster AT 2010model. I changed crank shaft oil seal . after dat no1&no2 cylinder not working . i checked. Changed spark plug,injectors .still remaio.plz help
Cheek the injector and spark plug and valav inlet