Question about 2002 Nissan Sentra

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Engine's making a knocking sound when idling. The check engine lights come on, and I've already replaced the sparkplugs. Another mechanic said it might be something else. And advice would be great

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You have a check light---We don't have the codes,you do?

Spark Plugs--What was that supposed to do?

Another Mechanic--might be something else--Want to share that with us?

Find a repair shop,explain in detail all this info,have them diagnose your main concern.
Just what you want fixed and wish to pay for,not what they want to pitch you.

Posted on Oct 09, 2010

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Posted on Jan 02, 2017

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A comparatively quiet engine is often a worn out engine.( Much of the knocking sound in an engine is caused by compression and expansion of gasses, which in a worn out engine is reduced due to leakage of gasses beyond the piston rings or valves.)

You will first have to have the engine pressure tested on each cylinder to ascertain the overall condition.
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