Mechanics

ACCELARATION PROBLEM

1997 Nissan Maxima • 200,000 miles

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.
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Adi1991
June 13, 2012.




Scan for codes and check vacuum at idle if 15" or belwo susmpect clogged converter


Hmac300
Jun 13, 2012.
Sir,
how can I check (vacuum at idle if 15" or below suspect clogged converter)and where I will find this.


Tiny
Adi1991
Jun 13, 2012.
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
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Rasmataz
Jun 13, 2012.
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?


Tiny
Adi1991
Jun 14, 2012.
You need to verify where exactly that knocking is coming from-


Rasmataz
Jun 14, 2012.
Example - this knocking is same when we are accelerating car from 0 km at 2 gear or 3. Means piston knocking.


Tiny
Adi1991
Jun 15, 2012.
Could be piston slap/wrist pin-either way it has to be fix with that mileage


Rasmataz
Jun 15, 2012.

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