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Old 08-07-2016, 10:27 PM   #12
cityhawk
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Join Date: Feb 2000
Location: Boston
Posts: 2,817
 

1993 SW2
2001 L-Series 3.0L Wagon
Default Re: subtle "rod knock" like sound, but the pattern is wrong

Quote:
Originally Posted by OldNuc View Post
Bad belt can cause noises. Passenger side axle. Loose wheel lug nut, right side.
I'm kind of thinking along these lines. I have a long drive to my second job in the morning. I'll double check the lug nuts before I leave... I did just do my front brakes. Otherwise I was thinking axle as a possibility. Perhaps I can put the front up on jack stands and get the car up to speed and see if I can reproduce it.

The sound is most pronounced while coasting in gear or under constant throttle or light load conditions. Pretty much goes away under acceleration.

I'd be very surprised if it were an internal engine condition... 163k, well-maintained engine (I've had it since around 67k miles, faithful oil changes and never running it low, full synthetics for the last 30k or so miles with minimal oil use (some leakage around the valve cover). Just to come out of the blue with a rod or piston problem would be surprising.... and the sound pattern just seems wrong.... it seems to be related to the drive train somehow, though only present when the engine is running with the drive train.

...
Saturns:
1993 SW2 MT 191,000 hard Boston city miles ("Rozzie")
Gone but not forgotten:
2001 LW300 ("Elle")
1999 SW2 MT
Project cars:
1966 Corvair Monza convertible
1928 Ford Model A Tudor Sedan

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