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What are the symptoms of damaged car valves?

2 Answers

McEverett

07/25/25 6:40am

Damaged car valves can cause issues such as incomplete sealing of the intake and exhaust passages, black smoke from the engine exhaust, and incomplete exhaust. A fault diagnostic tool can be used to perform throttle valve inspection by observing the data stream. If the throttle opening is too large, cleaning is necessary; if the throttle is confirmed to have a permanent fault, replacement is required. Throttle valves generally cannot be disassembled for repair and must be replaced as an assembly. Incomplete sealing of intake and exhaust passages: Damaged valves can cause incomplete sealing of the intake and exhaust passages, leading to engine air leakage, reduced cylinder pressure, decreased power, and increased fuel consumption. Black smoke from the engine exhaust pipe: In severe cases, it can also cause black smoke from the engine exhaust, air filter blow-by, and difficulty starting. Incomplete exhaust: This can shorten the lifespan of spark plugs and cause abnormal noises from the valves.

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TannerRose

08/10/25 6:15pm

You've got to be careful with that. I've driven many cars and encountered these kinds of issues. When the valves go bad, the engine starts acting up. The most obvious sign is the car shaking uncontrollably, like it's playing a dance machine, especially during idle or when climbing hills—it's particularly annoying. There's also this strange 'clicking' sound; as soon as I hear it, I know something's wrong. The power takes a big hit too, feeling sluggish when accelerating, and pressing the gas pedal doesn't do much. Fuel consumption definitely spikes, costing you hundreds extra every month for no good reason. Emissions become a problem as well, with black smoke pouring out the tailpipe, polluting the environment and being a nuisance. Starting the car might also get tricky, requiring multiple attempts to get it going. If these symptoms aren't addressed promptly, other engine components can get damaged, doubling the repair costs. That's why I always advise people to get their cars checked at the shop early—don't wait for a small issue to turn into a big headache.

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