Serious knocking....

[JaaDogg]

Here is the long and short of it... I had a serious knocking noise, took my car to a ****ty shop and eventually had a "used" engine put in the 89 240sx I call my daily driver. The car stopped knocking for a while but basically returned back to knocking... The lifters have been changed so many times I have lost count. Sometimes it is quiet but most of the time it knocks, especially after it has bee driven for a long distance (try not to do that anymore). Is there anything else aside from the lifters that could cause that knocking noise? Any help or advice would be greatly appreciated.

[SyndromeVII]

knock sensor maybe

[s13redtaz]

which motor was it "replaced" with single cam or dohc?

[s13redtaz]

the reason i ask is the dohc engine is known for the timing chain guides being rubbed by the chain causing a tick/knock.

[wankelTII]

What weight oil are you using? Does it do it all the time or does it come and go or change at all?

^^^Knock sensors dont make noise, they sense high frequency vibrations.

[Florida240sx]

Put some lucas in there it'll quieter her down...... If it was a rod bearing then it wouldn't go away