Rattle/ticking/knocking...

[SkunX]

Hey everyone,

sorry for the title but to me it sounds like a rattle, others have called it a knock and a few others called it a ticking...


I picked up a 93 coupe last sat. and on my way home (I live in crystal river FL, and I went down to Tampa to buy the car.) after about 50-ish miles (it's about a 70 mile drive) I noticed that from about 2.5K to 4K there was a knocking/rattling noise.If I hold it at a constant speed it's really noticable, But if I go WOT the sound goes away. I didn't think too much of it at the time cause I was so happy about owning a 240. After I got home the thought of it started bothering me, so on sunday I did an oil change and replaced the filter hoping that might help the sound, no luck. So I got online and started looking things up (I didn't know Haynes didn't make a manual for 240's, so I'm still looking for a Chiltons, or any other brand that makes them.) and found that the upper timing chain guide will cause a rattling sound, so I pulled the valve cover and saw that the pervious owner or the dealer I bought the car from already removed it. I read that the tensioner not working correctly may cause the rattle also. Are there any other things may cause the sound, I'll try to post a sound clip later tonight.

I'm a n00b about Nissans, My other car was an Acura Integra.

[ManoNegra]

That sounds like a loose/old timing chaing alright.

[SkunX]

I was just outside and I was listing to it, and it does sound liek it's coming from the timing chain, The dealer said he just replaced it, so is it possible that it's just the tensioner thats causing the rattling?

[los_inc]

injectors also tick so do busted relays.

[SkunX]

injectors also tick so do busted relays.

I didn't think about that, My left headlight comes up when I turn my lights on, but it doesnt go back down with the other one, Would that be because of a bad relay or just a stripped gear in the motor?

And how would I go about finding out if it's the injectors making the ticking?

Thanx for the help guys!

[McRussellPants]

my cars doing that from a cracked piston.

[SkunX]

Ouch, I really hope thats not my case. What are the other signs of a cracked piston?

[Edgar]

my cars doing that from a cracked piston.

bvwhahahahahaha that made me giggle for some reason

[idlafie]

Check your exhaust system....rattling could be due to loose or rusted heat shields. Could also be the honeycomb inside the catalytic converter could be cracked and rattling around. Those are problems known to happen with S13's.
Hope this helps...
ID