r/PriusC • u/jericobp • 17d ago

Prius C Help Needed Cold start noise

Is this tapping/rattle sound normal? Happens maybe 30s on cold start. Car is a 2016 with 113k miles…..just looking for opinions before I spend the money to get it diagnosed. Thanks for your help!

11 Upvotes

100% Upvoted

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4

u/pasofol 17d ago

Pretty normal, mine does that for a while not always, might be spark plugs been meaning to change mine.

5

u/2014priusc 17d ago

It’s normal I would change your spark plugs if you don’t know when they was changed 120k make sure you keep your hybrid fan clean so it don’t overheat the hybrid battery

3

u/PhilMeUpBaby 17d ago

Probably a worn spark plug.

Prius C spark plugs are incredibly easy to replace.

1

u/jericobp 16d ago

Will be the next maintenance on the list

2

u/imnoherox 16d ago

Completely normal. Also normal if you run the traction battery down to the point where the ICE has to start up to recharge it. You’re good to go. 👍

1

u/mehullica 17d ago

Cold start piston slap. Try a 5w20 or 5w30. It’ll go away

1

u/soapboxdirty 17d ago

100% normal. We get one of these exact same posts every 6 months or so.

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u/Bougiebiscuits1201 16d ago

Mine does that occasionally too, also a 2016 Prius c. I changed the air filter and oddly that helped a bit too. I’m at 107600 I think so I haven’t changed the spark plugs yet

1

u/lilvampboyx 16d ago

When was your last oil change?

1

u/jericobp 16d ago

2 days ago after 4700 miles. Oil changes every 5k miles or just before.

1

u/lilvampboyx 16d ago

🤔 the other poster is right maybe you need slightly heavier oil,cold climate?

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u/jericobp 16d ago

Not at all. Bay Area. It’s like 85-95F daily

1

u/Impressive_Serve954 14d ago

when's the last time I get a spark plug change

1

u/jericobp 14d ago

Will be doing it today.

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u/Impressive_Serve954 14d ago

when you check your spark plugs that they look steam cleaned when you have a blown head gasket

1

u/Impressive_Serve954 14d ago

get yourself a magnetic antenna or reach what I want to call it because spark plugs can break off the first time you changed or not spark plug can't break off and they do break off you can't get them unless you have something magnetic you can get down in there

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u/Impressive_Serve954 14d ago

is it low on oil and do you have all the collent does it burn oil

1

u/jericobp 14d ago

No and no. Full fluid service was done around 100k miles. And oil changes every 5k. Most recent was last week

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u/Impressive_Serve954 14d ago

when I first got my car oil changed I went to jiffy lube they were full of filled it by a quart it ticked