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Is this " mechanic" not diagnosing and scanning the issue ? Sounds like a new parts fitter.
On those Nissan 4 cylinders with higher mileage they have been known to have an issue sounding like you explaining caused by the timing chain getting stretched a little too much causing an issue with your timing. Hence misfiring. Now I must say that there are other things that can cause misfiring too. For instance fuel. Have him hook up a timing light and see if it is firing after top dead center. If yes .. could be a stretched timing chain. Hope this helps
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Good luck
Sam
A Nissan ultima does not have a timing belt,it has a timing chain,look up in your manual for your maintenance schedules when and at what mileage you are needed to change the chain,usually the chain is changed when it is loose through stretching in wear over mileage,a very loose chain has a rattling noise in the engine compartment by the cam gears,good luck ,hope that I was helpful.
a timing belt change is not monitored by the service engine soon light.it comes on when the computer detects a problem and sets a code.the code will have to be pulled to know what area to start to diagnose.the ticking could be anything from low or dirty oil needing to be changed to the valves may need adjusting,even a worn or dry belt can make a ticking sound.you don`t say how many miles are on the car or if you have changed the timing belt.if the mileage is over 100,000 kil(60,000 miles) then it should be changed.
well maybe there was some mis-communication there , nissan stopped using timing belts in sentra's and actually most all models in 2000 , maybe they were telling you that your serpentine belt needed changed ? but to answer your question , you do not have a timing belt in your 2002 nissan sentra . its a chain . thanks
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