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Car Forum / Nissan / Nissan Cars / September 2005rattle at about 2,700 to 3,000 rpm
Hi to all: I just purchase a 1997 Nissan Altima with about 83,000 miles on it. Maintainence records, clean oil, etc. I noticed when driving at about 2,700 to 3,000 rpm I hear what sounds to be a rattle...They type that may come from a shield or guard. The frequency of the rattle stays constant as you rev the engine past 2,700 rpm. I've also listened under the hood, revving the engine by hand, and it seems as though it's coming from under the engine. I must say though, that it is more noticeable inside the car than while listening under the hood. The exhaust system was recently replaced. When listening inside the car, it seems as though it's coming from under the engine. It also sounds like it may be a bearing. Does the idler wheel sometimes produce this noise? Could a frayed serpentine belt produce this sound? (Or whatever the belt is that rides against the idler pulley) I stopped in my driveway, revved the engine up to the 2,700 rpm point and hear the rattle. I guess I can rule out the transmission. Any ideas? The guy that sold it to me just had the plugs changed, changed the oil with Mobil 1 synthetic. Other than the rattle, the engine has lots of power, and I cannot see anything obvious-> I'm not a mechanic though :( Thanks for the help. I hope that it's nothing serious. Art > Hi to all: > [quoted text clipped - 22 lines] > > Thanks for the help. I hope that it's nothing serious. It might be a rattling heat shield or something like that. Isolating it is often tricky. I found that fishing pole tips or gardening sticks makes excellent poor man's stethoscopes: put one end of the stick on the suspected part. Hold the other side in your fist and put it to your ear. You should be able to pinpoint the offending part this way (your neighbors will probably talk about you now, using a fishing pole to fix a car :) Hope you find it soon. Remco On 9/12/05 2:02 PM, in article rrjbi15eab4isarsddgvg5b5bj1mrh7g13@4ax.com, > Hi to all: > [quoted text clipped - 24 lines] > > Art You can try pushing on the exhaust pipe with a stick while the car is running and making the noise to see if it makes it go away. If it does, check the hangers and heat shields. That engine had known issues with the timing chain tensioner and guides in earlier models, possibly still in 97. The symptom is a rattle at a certain RPM range like you describe. Start the engine and have somebody rev it to the range where you hear the rattle and probe around the front of the valve cover with a hose to see if the sound is coming from that spot. The fix is to take off the upper chain cover, remove the top chain guides (NOT the tensioner) and throw them away. A failing accessory belt tensioner or a chunked up belt also makes a similar sound (per your question above - the answer is yes). I experienced all of these things on the same '95 Altima (chain and belt issues). So, I would first replace the belts if they look like they need it. Check the tensioner and other pulleys while you're at it. Then if the rattle is still there, take the hose and check for a rattling chain. > Hi to all: > [quoted text clipped - 24 lines] > > Art I BET it's the heat shiled for the CAT. IN my 98 Maxima, it developed a rattle that sounded as if it was deep inside my dash. I was thinking, oh my god, I will never get rid of that rattle if its in there. Lo and behold my mechanic was working on my car one day,found the heat shield loose and fixed it. The noise was GONE. CD Thanks for all the help on the rattle. I haven't heard it today. Hmmmm....I will check the shield and the belt tensioner. I've heard what sounds like a brake squeal from the left front wheel. It is there at most any speed. Comes and goes. I looked at the rotor, it looks fine. I noticed it first thing this morning pulling out of my driveway. While it squeals, I put the car in neutral lightly tap the brakes. The squeal either stops or sputters, quits, etc... What would a bearing symptom sound like? What about a CV joint? The car has 83,000 miles on it and is the 1997 Altima. I'm pretty darned happy with the car, and would like to work out the bugs. It runs like a scared rabbit and handles great. Thank you all for the help, Art > Thanks for all the help on the rattle. I haven't heard it today. > Hmmmm....I will check the shield and the belt tensioner. [quoted text clipped - 14 lines] > > Art When checking the brakes, check the pads. The pads wear out, and to let you know, this metal thingy starts to touch the rotor as it's spinning. That metal thingy touching the rotor is making the squel you're hearing. It is more commonly called a wear indicator. If continued to be neglected, the pad will wear to bare metal and start scratching and permanently damaging the rotor, in which case the brakes pads AND rotor will need to be replaced. If a wheel bearing is bad, you will hear a steady hum. To find out whetther it's the left wheel or right wheel, while on the highway running at a steady speed, turn left and right. If the humming noise increases while you're turning right, it's the left wheel bearling and vice versa. CD Thank you for the great advice. I will pull the wheels tomorrow, Art |
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