knocking on acceleration. why?

[MYFREE95,240SX]

first off.. not a rod knock. i took it for a 135mph run the other day and was fine until i stopped driving it later on that night approx. 1.5 hours later. only happens when engine under load. i have heard numerous reasons for this. wondering if you guys have some better advice. its a ka24de 218,000 miles yes that many but runs like a champ. no build up inside. dd with no issues in literally over a year besides tires some advice guys? thanks

[sx moneypit]

Is it pinging (detonation) or knock?

[MYFREE95,240SX]

well it just sounds like a truck... but i can hear a ping every once and awhile wen i rev with hood up cant ever hear it when driving its like the whole sound of my car changed nothing else. no power loss. ping was there for a while now. this sound just changed 2 days ago. pulled valve cover (see the nice paint job i did?) and found upper timing chain guide literally resting on the chain i was broken off. so removed that. hoped that was what the noise might of been but was not.

[sx moneypit]

Does it sound like one cylinder making the noise?

[MYFREE95,240SX]

honestly u cant tell over the general sound of the engine its a slight ping

[sx moneypit]

With 218000 on the clock you could have some carbon buildup problems on the cylinder head .By the way have you checked your timing?

[MYFREE95,240SX]

have no clue how to do the timing. i run cleaner through it often like every couple months and i seafoamed it like a year ago. so in your opinion my timing could have just all of a sudden gotten skewed? wouldn't that take time?

[sx moneypit]

It shouldn't have,but you need to check it.Got to start with the basics.How is the engine temp?

[MYFREE95,240SX]

temp is perfect alot has been replaced almost everything besides internals really injectors,radiator, water pump wires spark plugs... could they have fouled under a high speed run like that? dist. is new. umm almost every sensor is new. cts, knock sensor, 1 of the 2 o2 sensors,umm damm trying to think of everything i have done... there is not really anything that i feel wrong just the sound.

[sx moneypit]

You need to pull the spark plugs and see if it looks like the car is running lean.Could be a fuel mixture problem.

[MYFREE95,240SX]

i will do that i actually thought of it as i was writing that the spark plugs are new... well we are having a blizzard out right now so... gonna have to wait. i guess no playing in the snow today...

[sx moneypit]

Yeah you guys have been getting hammered by snow up there lately!It snowed here yesterday and last week.Ill be checking this thread,keep posted.

[MYFREE95,240SX]

thanks for the input will keep you posted.