belt squeal on cold start · squeal when starting car
A high-pitched squeal that happens right when the engine starts, especially on a cold morning, and often fades after a few seconds.
Visually inspect the drive belt for cracks, glazing (shiny surface) or looseness - this is a quick, no-tools visual check.
Usually safe short-term, but a belt that fails completely can knock out the alternator, power steering and sometimes the water pump all at once.
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Descriptions are for guidance only and do not replace a workshop inspection. If you are ever unsure whether it is safe to keep driving, pull over in a safe spot.
Rough or shaky idle
WarningThe engine feels rough, shaky or uneven while sitting still (in park or at a stoplight), as opposed to running smoothly.
Engine stalls while driving or idling
SeriousThe engine unexpectedly shuts off entirely, either while idling (at a stop) or, more seriously, while actively driving.
Car vibrates or shakes at idle
WarningThe car shakes or vibrates noticeably while stationary with the engine running (in park or neutral), but smooths out once moving.
Knocking noise from the engine
SeriousA rhythmic, metallic knocking or tapping sound coming from the engine, often changing pace with engine speed.
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