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Accelaration problem

Tiny
ADI1991
  • MEMBER
  • 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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Wednesday, June 13th, 2012 AT 5:59 PM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check vacuum at idle if 15" or belwo susmpect clogged converter
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Wednesday, June 13th, 2012 AT 7:43 PM
Tiny
ADI1991
  • MEMBER
  • 60 POSTS
Sir,
how can I check (vacuum at idle if 15" or below suspect clogged converter)and where I will find this.
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Wednesday, June 13th, 2012 AT 10:01 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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Wednesday, June 13th, 2012 AT 10:12 PM
Tiny
ADI1991
  • MEMBER
  • 60 POSTS
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?
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Thursday, June 14th, 2012 AT 6:38 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You need to verify where exactly that knocking is coming from-
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-1
Thursday, June 14th, 2012 AT 11:56 AM
Tiny
ADI1991
  • MEMBER
  • 60 POSTS
Example - this knocking is same when we are accelerating car from 0 km at 2 gear or 3. Means piston knocking.
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Friday, June 15th, 2012 AT 8:34 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be piston slap/wrist pin-either way it has to be fix with that mileage
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Friday, June 15th, 2012 AT 8:51 PM

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