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I hear a distinct rattling sound on my 180SX -- and it's intermittent, not often and clangy like rod knock -- it seems like both at the top and bottom of my SR20DET redtop, but very hard to pinpoint. Seems worst at 3k-4k, not always present when my car is cold, and usually most audible after letting off the gas or upshifting.
After getting my exhaust quietened up with a better resonator this week the sound was very noticeable. Sounds like a rattle that is very evident usually after letting off the gas and after having my timing adjusted from -2deg BTDC (wtf?!? Don't ask, I just got my car from Japan) to the stock 15deg BTDC.
Right now I'm pretty new to this car and lovin' it... Never had such a fun time putting in plugs before! Wow, done in 15 minutes flat. But I don't have a compression tester, oil pressure guage, or a lot of experience with engines... I'll keep testing though! I am not giving up on my redtop with only 100,000kms yet!
My SR20DET is a feb/91 engine, one of the first to ever go in a 180SX/S13 in Japan. I hope and pray this ain't rod knock. I'm going to have it looked at hoping it's timing chain issues. The last shop told me it was rod knock. I think they're wrong but they may be right. They're reasoning is "when you rev it it's obvious... it sounds like s**t." and "Well, it's coming from the bottom end and we've seen dozens of redtops... it must be rod knock". Anybody have a similar experience -- misdiagnosed timing chain rattle or problems as rod knock on the redtop or blacktop SR20DET?
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