accelaration problem

1997 NISSAN MAXIMA
200,000 MILES
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ADI1991
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i have nissan maxima 1997 auto transmission. it has a problem that when i am accelerating it slowly the pistons knock and engine vibrate. but in sudden or fast acceleration the cars moves smoothly.

i already changed fuel pump and spark plugs with coil.
Jun 13, 2012 at 5:59 PM
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HMAC300
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scan for codes and check vacuum at idle if 15" or belwo susmpect clogged converter
Jun 13, 2012 at 7:43 PM
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ADI1991
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sir,
how can i check (vacuum at idle if 15" or below suspect clogged converter)and where i will find this.
Jun 13, 2012 at 10:01 PM
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RASMATAZ
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You need a vacuum gauge -You sure the engine is not detonating/pinging if so check the knock sensor and also if the engine is overheating
Jun 13, 2012 at 10:12 PM
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ADI1991
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no the engine is not pinging. only the problem which i told you. piston knocking at the time of slow acceleration.

may be it is from gearbox?
Jun 14, 2012 at 6:38 AM
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RASMATAZ
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You need to verify where exactly that knocking is coming from-
Jun 14, 2012 at 11:56 AM
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ADI1991
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example - this knocking is same when we are accelerating car from 0 km at 2 gear or 3. means piston knocking.
Jun 15, 2012 at 8:34 PM
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RASMATAZ
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Could be piston slap/wrist pin-either way it has to be fix with that mileage
Jun 15, 2012 at 8:51 PM