Question about 2001 Nissan Xterra

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2001 xterra (update) engine service soon is on

Hi , my xterra doesn't pick up right when I accelrate. It stumbles and shakes like if fuel isn't burning right. Of course it has a lack of power. I did not have it coded but could it be the knock sensor? If you have any ideas please help and I would need the location sheet for any sugested sensor at fault if possible , that would be a huge help... thx

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  • giodog2000 May 23, 2009

    Hey louie, I proceded at changing the spark plugs this morning. The 6th is tricky but ok. Those old plugs were a mess. Some barely had an electrod left. After replacing the plugs the truck now runs great : more power , steady idle , no stumbling. But here is my concern. When I pulled out the old plugs , 4 outa 6 came off with no spacers(that metal ring) Only plug 1 and 6 came out with the spacer . I checked in the whole and tried reaching with a magnet but nothing came outa there. In all the plugs changes I,ve made in my life I have never seen a plug leave it's spacer jammed in the hole. How bad would it be if I put a new plug with the spacer in there adding another spacer on top?



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Hello, A lack of power can come from a multitude of problems and I will give you guidance and how to solve your problem. I would first change your oil and fuel filters and run some injector cleaner through your system to see if this helps your underpowerment. Next, I would do a tune up and replace your spark plugs and wires, oil and oil filter, rotary cap and button. You may have some faulty coil packs and possibly a fuel pump which is about to go out as well. I would try a mid grade or a higher grade of gasoline for your vehicle with the fuel injector cleaner, fuel filter, and air filter. If this does not solve the sputtering, Autozone offers free diagnostic of your electrical system and they will run a code check on your vehicle for free! I would be safe and guess this is just a clogged fuel filter or some corroded wires on your coil or your spark plugs so give your engine a good once over and this tune up. Yes, this can be a knock sensor as well to answer your problem and by knowing that I know you have enough mechanical knowledge to fix whatever is ailing your vehicle! The knock sensor senses when fuel is burning unevenly and causing "knocking" or irregular vibrations in the engine. I hope this helps you fix your problem!

Posted on May 23, 2009


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