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Today's topics:
* Strange new noise - 1 messages, 1 author
http://groups.google.com/group/alt.autos.nissan/t/d6e4aec8892236ed?hl=en
* Engine Temperature Problem? 1999 Sentra 2.0 - 1 messages, 1 author
http://groups.google.com/group/alt.autos.nissan/t/54a063b2d0a4fdd0?hl=en
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TOPIC: Strange new noise
http://groups.google.com/group/alt.autos.nissan/t/d6e4aec8892236ed?hl=en
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== 1 of 1 ==
Date: Tues, Jul 6 2010 9:30 pm
From: Plague Boy
willshak wrote:
> Plague Boy wrote the following:
>> <text not snipped in hopes of more answers>
>>
>> E. Meyer wrote:
>>> On 6/24/10 10:30 PM, in article
>>> xLWdnd1vLtcmv7nRnZ2dnUVZ_tadnZ2d@earthlink.com, "Plague Boy"
>>> <plague_boy@earthlink.net> wrote:
>>>
>>>> Well. The '92 Sentra has been running fine and I'm hoping to get
>>>> another 1-2 years before it completely rusts out and has to be
>>>> junked. But it's making a funny noise now.
>>>>
>>>> I first noticed it last weekend, it slipped my mind until I
>>>> drove again today. It's a little hard to describe, it's like when
>>>> you pull the compression release on a motorcycle, or a cricket-a
>>>> trilling cricket, not a chirping cricket. The noise is "outside"
>>>> because I only hear it when the windows are open and it has
>>>> something to reflect off of.
>>>>
>>>> I *only* notice it when I am decelerating, and it changes
>>>> frequency with the RPMs of the engine, not the road speed. If I
>>>> depress the clutch, it goes away. If I step on the gas, it goes away.
>>>>
>>>> I guessing it only is noticeable under high engine vacuum. So,
>>>> some kind of vacuum leak? Could a loose exhaust cause this kind
>>>> of sound? I've had exhaust problems with this car.
>>>>
>>>> I popped the hood and revved the engine and did a quick visual
>>>> inspection of the engine compartment. No noise, and no visible
>>>> problems.
>>>>
>>>> I will look further, but I'm not sure how to duplicate a sound
>>>> that only is noticeable when the motor is driven by the wheels.
>>>> Thought somebody here might have a clue to get me in the right
>>>> direction.
>>>>
>>>> '92 Nissan Sentra, 1.6L, 5sp man, 177K AC PS PB
>>>
>>> If it still has any of the heat shields around the exhaust pipe, I would
>>> start by checking those. Just give them a tap & see if you get
>>> rewarded with
>>> a rattle. Other possibilities are worn accessory belts & bearings in
>>> belt
>>> tensioners/ idler pulleys. These tend to show up predictably at certain
>>> engine revs though.
>>
>> Yes, there's still one or two of the heat shields on the exhaust,
>> and yes, they rattle. But this noise is not a rattle. I'd have to
>> describe it as an "air" kind of noise. It sounds as if the engine is
>> sucking in air through some kind of constriction, and it is ONLY
>> noticeable when you are backing off the gas so the car is compression
>> braking AND mostly when there is something to reflect the sound back
>> at the passenger compartment.
>
> Have you ever had the timing belt changed? You're over 100,000 miles
> past the averaged life span of 60,000-70,000 miles. Not that they all go
> at those miles.
I've owned the car 3 years, in which I've put about 3Kmi on it.
The person I bought it from didn't even change the oil, let alone
any other maintenance. I don't have the records, so I don't know
what might have been done prior.
I was under the impression that this engine uses a timing chain,
not a belt.
--
PB
"I suspect you're an arrogant little pissant who grew up in the
Red Bull generation." - CJW
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TOPIC: Engine Temperature Problem? 1999 Sentra 2.0
http://groups.google.com/group/alt.autos.nissan/t/54a063b2d0a4fdd0?hl=en
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== 1 of 1 ==
Date: Wed, Jul 7 2010 12:50 pm
From: John Henderson
DanielleOM wrote:
> Other than change a headlight lamp, I have not done any maintenance work on
> this myself. I live in an apartment building away from family with garages.
> Sears auto just flushed the radiator and they tell me they did it before
> after changing the thermostat. It was overheating before I went in there
> and it did it again after. I saw no real change.
>
> Interesting question about the water pump. How can you tell if it's
> working? I don't have gauge in my dashboard that measures engine coolant
> flow. The car has 200,000 miles on it now and it has the original water
> pump. I am not familiar with the water pump design. I have heard of
> European cars where plastic parts were used in water pumps that gradually
> deteriorate over time.
Not having experienced a water pump failure for myself, I can't
suggest specific symptoms on your engine.
A friend had poor cooling system performance, along with very
slow warm-up (not a Nissan), and I diagnosed thermostat
failure. The garage he got to replace it claimed that the
thermostat failed because the water pump had failed. With both
replaced, the cooling system performs brilliantly.
I agree with Peter that a blocked radiator is likely in your
case, but wanted to alert you to other possible causes.
> Starting to debate if I should repair or move on to another car. I still
> like the way this one for the reasons that I bought it in the first place
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