bad fuel or water in it. condensation made mine knock so bad I thought the rods were gonna fall out in the driveway. use some fuel dryer or techron in it or pull the filter, put an extension hose on the fuel line and pump the tank dry. takes a bunch of turning the key on and back off because of the 8 second timer, but you can pump it all out eventually. don't burn your car or garage down doing it, do it in open air. put some Amoco Ultimate in it. keep the tank topped off so water doesn't condense in the tank when the atmosphere cools off at night.

 

no this is wrong..

your lifters have worn themselves and no longer hold oil hydroulically..

if you get ANY water in your tank for any reason you need to have it fixed.. it should be air tight.

as far as your bucking, look into TPS resistance.

 

What is the TPS resistance? Also, how do I know if there is water in the tank. The noice only is noticable when I first start the car up in the morning. After awhile, the noice stops. So, what is the next step?

 

You may have bought some bad gas - with lead in it. Check out the O2 sensor.

Pierre

 

Pierre I would like to thank you for the information, but do you know how much it would cost to fix if it is the 02 sensor. Is there another way to clear this up without going to Nissan to check the 02 sensor?

 

The ticking noise is from your lifters or your injectors. If it is from your lifters it is because they are worn a little, or they are not getting oil at first. If it was your injectors it would usually start after the the car has been warmed up. If you had water in your gas it would stutter alot. The bucking is because the car is not warmed up as well as the tranny. My 85 does it on colder mornings and in the winter.

 

The noise I hear every morning is loud knocking and does not let up even when the car is warm, it gets louder. Now what should I do know? I bearly touch the pedal the bucking is so obvious and does let up after the car warms up. Could this be the 02 sensor or something else? Let me know more about this car that I love very much after 16yrs.

 

It is not your engine that needs warmed up, its your tranny that needs warmed up. My 85 is the same way when it is cold.

 

Kz31,

What do you mean by the tranny warming up, I thought when the car is warmed up then the bucking would not be there when I accelerate. It does buck when the tranny or engine warmed up. After I shutt off the car for awhile, the bucking would start again. So it doesn't matter if the car is cold or warm. So then what could it be this time? The knocking noise was the alternater loose and needs to be tighten up. Please let me know what the problem is with the bucking now.

 

Kz31,

FYI: The noise that I was hearing under the hood was the alternator loose and the other problem of bucking maybe the o2 sensor going out. What do you think about my solution?