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Old 08-23-2001, 08:00 PM   #1
Eric SS
Sooby Guru
Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2014 Q60S, 2016 Chevy SS
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Default Blown engine Diagnosis pt. 1

Still haven't gotten the engine apart yet but upon further inspection of the one really bad sparkplug, I noticed that although the groundstrap was pushed right up against the electrode, the plug had absolutely no marks on it indicating that it had been hit by something.

This perplexed me but I recall someone once saying that detonation can cause this to happen so I'm going to guess that that is what happened.

Anyway, that is a good thing because more than likely nothing broke loose and went through the head.

So, On a whim, I decided to put new plugs in the engine and try to start it to see what happens. I wanted to see if it was really a dead cylinder or just the fact that I was not getting any spark into that cylinder was what was killing it and possibly an arc or something was making that noise.

I started the car up and it started right up with no missing! but I could still hear noise. not very bad at idle but if I reved it I would get more noise. Still not to bad but it sounded like what an engine sounds like what a pushrod engine sounds like when you have a very bad lifter or something. a big ticking noise.

I checked my boost gauge and didn;t see any vaccuum fluctuation at all and it seemed to be reading about 15 in/hg which is what it usually reads at idle.

So, I turned the car off and repulled the plug from the bad cylinder and there were traces of oil on it.

So, my diagnosis has changed. I believe I either A) blew an oil ring (most likely) or B) blew a valve seal which would help explain the ticking noise.

So, from this data, what does everyone else deduce? especially Mr. Evander

Thanks guys! I think the car is driveable but I'm not goingto test it

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Old 08-24-2001, 01:51 AM   #2
Scooby Specialist
Member#: 3884
Join Date: Jan 2001

Several of us know a guy with three broken pistons whose car sounded just like that. He drove it around for days without any apparent problems beyond a ticking sound, very similar to what you describe. I think he even had a similar bent spark plug.

Kinda' makes you go "Hmmm....."
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Old 08-24-2001, 02:48 AM   #3
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Join Date: Jan 2001
Location: Ohio
2005 Legacy GT


Eric!! Good news!! If your engine is anything like the engine Bud described, then you can at least drive the car for a little longer!!

Here is some advice that my grandpa gave me a long time ago. "Never trust a ticking package" (He was a paranoid old hermit.) But I think the same could go for engines. Best bet in my eyes is to have Robert look at it. He seems to know a thing or two about Subarus.

Good luck.

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Old 08-24-2001, 12:41 PM   #4
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Join Date: Oct 1999
Chapter/Region: SWIC
Location: Phoenix, AZ
12 CTS-V Wagon
17 GTI


Hmm that sounds strangely familiar. Sounds like you are describing my engine.

I had 1 piston with a chunk missing from it, and the other three were cracked. I also had valve problems from where the one piston hit the valve and from the associated metal fragments.

I hope your diagnosis turns out better.

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Old 09-02-2001, 02:26 AM   #5
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