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Guest Message by DevFuse

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1998 Forester Engine Noise - Rod knock?

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9 replies to this topic

#1 wtdash


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Posted 24 July 2014 - 11:13 PM

This is the stock 2.5 / EJ25D.
Is this ROD knock or valves?
Code for Misfire on 2 cylinders, too

Edited by wtdash, 24 July 2014 - 11:22 PM.

#2 ShawnW


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Posted 25 July 2014 - 01:45 AM

Sure sounds like Rod to me.

#3 idosubaru


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Posted 25 July 2014 - 07:12 AM

Sure sounds like Rod to me.


#4 MilesFox


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Posted 25 July 2014 - 08:57 AM

How many times did it overheat?. If it weren't for the video, i would suggest piston slapif it went away after warm up, or if it was a slighter sound, suspect the tensioner causing backlash in the timing belt.


Defintitely a rod knock. Mine decided to blow a ring land after i gave it some 'PTFE engine guard'

#5 wtdash


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Posted 25 July 2014 - 09:43 AM

Thanks for the feedback.


The car was on a road trip and had been driven about 100 miles from home when the noise started.


 I bought it used in '11, fixed the head gasket and it was driven approx. 25K miles over the last 3 years before the knock started.


IIRC the previous owner had already fixed the HG once before, so I don't know how bad/many times it was overheated.

#6 johnceggleston


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Posted 25 July 2014 - 11:09 AM

if it is rod knock,

you may as well drive it till it stops.

you can't save it.



but what if it is tensioner noise?

not un common on the 98+ engines.

(note: no sound on this computer, so i did not listen)

#7 wtdash


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Posted 25 July 2014 - 12:53 PM

^...other than it's quite LOUD ! :-)


I thought that the rod may end up thru the case rendering it scrap? But if we pull it b4 that happens, the block itself can still be rebuilt, correct?






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Posted 25 July 2014 - 03:49 PM

Yeah its definitely not a tensioner from the volume of the noise.

If it was me (and it was me about a month ago on a knocking 25d 98 forester) I just swapped a 22e to save the case halves for another day.

#9 Fairtax4me



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Posted 25 July 2014 - 06:10 PM

There's a click in there that's too fast for rod knock. Sounds like a collapsed hydraulic lifter, but that engine doesn't have any. But there's also a much deeper knock going on which could certainly be a rod. What does it do if you rev it up some?

Still worth it to pull the timing cover and check the tensioner.

#10 Mr. Carb

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Posted 25 July 2014 - 09:00 PM

That sounds just like the rod knock my ea81 had. Rod bearings on cylinder 2 and 1 were completely gone at that point.

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