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Old 03-02-2012, 10:01 PM   #1
etidatreyu
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Default Engine Trouble, V2 STI

I was driving the car today and the power cut off a couple times like i stalled, but I was driving so theres no way I stalled. So i assumed it was a wiring issue and was planning on getting it checked out, then on my way to work I heard a popping, the engine lost a **** ton of power, and now feels like its REALLY bogged down. Almost sounds like a lawn mower. Anyone ever experience this or know what the problem could be.
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Old 03-02-2012, 10:34 PM   #2
suberdave
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check to make sure you didnt loose a charge pipe. anything between the maf and intake will cause all kinds of issues.

-=Suberdave=-
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Old 03-03-2012, 12:24 AM   #3
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alright ill check it out in the morning, thank you
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Old 03-04-2012, 05:57 AM   #4
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Old 03-04-2012, 10:46 AM   #5
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So what came loose?
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Old 03-04-2012, 02:20 PM   #6
etidatreyu
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looks like one of the spark plugs melted and shot out of the engine and i was running on 3 cylinders. thank god there was no internal damage
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Old 03-04-2012, 06:42 PM   #7
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Quote:
Originally Posted by etidatreyu View Post
looks like one of the spark plugs melted and shot out of the engine and i was running on 3 cylinders. thank god there was no internal damage
Melted and shot out? Unless I've gone completely mad I could swear an EJ20 engine uses an aluminum cylinder head. How are you melting and shooting a plug out without damage to the head and or at the bare minimum the spark plug threads.

Hopefully it was something far less dire like an improperly torqued plug that vibrated loose.
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Old 03-04-2012, 07:14 PM   #8
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Well the spark plug itself is definitely melted. But I'm not really sure, the guy that looked at my car said it looked like it "shot out" but then again he also told me I had to lift the engine out to replace the plugs because of how snug the engine fits. Which doesnt appear to be true. So who knows. But he replaced that one plug with a different kind then I was currently running on so I could get it home, which is about a 2 minute drive thank god, and it appeared to be running fine, a little hesitating, but once all the plugs are replaced and the correct type hopefully it will be running 100%
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Old 03-05-2012, 05:43 AM   #9
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How bizzare. What part of the spark plug was melted?
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Old 03-05-2012, 10:15 PM   #10
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pics please!
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Old 03-05-2012, 11:45 PM   #11
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I actually don't have the spark plug, but it was down by the ground electrode/firing end or whatever you want to call it.
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Old 03-06-2012, 06:18 AM   #12
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You might have a bigger problem than you think.
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Old 03-06-2012, 10:00 AM   #13
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Yeah im looking into it. I was told a new coil pack and sparkplugs, but we'll see what it ends up being.
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Old 03-06-2012, 10:02 AM   #14
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Do you have any idea what the "bigger problem" could be by any chance?
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Old 03-08-2012, 05:38 AM   #15
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Well, for a spark plug to melt (electrode end), it usually is a sign of very hot/detonation present. *This is not a normal situation, so something must have caused it. *

If you have changed absolutely nothing on the engine and it just did it, then it could be a cylinder running unusually lean because, for example, that fuel injector is blocked. *You need to track down the cause.

then, you could have done other damage to that cylinder, eg piston damage if it was detonating.

All this is speculation but you need to work it through thoroughly.

Cheers
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Old 03-08-2012, 01:36 PM   #16
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Alright thanks alot man, ill definitely look into it. Thank you
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Old 03-08-2012, 01:51 PM   #17
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Might be time for you to invest in a wideband A/F guage. Also may be worth going to a colder plug and verifying plug gap.

What Make/Model of plugs are you using? NGK, Denso, Champ, etc?

I'm the first person to try out new types of plugs Like PulsePlugs or Diamondfire plugs and I am telling you dont. Stick with a good old fashioned Copper J-Wire plug like an NGK V-power BR6EK gapped at .028 . Use antiseize on the plug threads and squirt some dielectric grease in the plugboot on the coilpack.

Run them for 3-4 days of periodic driving and then pull each one and check the condition.

Something like running lean will show up right away. There is a cheatsheet floating around with Pic's of spark plug electrodes in various condition and a guide showing you what it means.

Figure out which cylinder(s) are causing you trouble. If its just one cylinder fine you can troubleshoot that. If its all of them you likely did something wrong. Wrong temp plug, wrong gap, wrong fuel, running more boost without tuning for it, etc.
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Old 03-08-2012, 02:24 PM   #18
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A google search of "Spark Plug failure Analysis" will provide you with a wealth of information
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Old 03-09-2012, 02:06 PM   #19
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Alright awesome thank you. Yeah I'm running NGK bkr7e and it seems to have somewhat gotten rid of the issue, I still plan on looking into what made it melt though. It seems like it may be running a bit rich, and I already have the Wideband gauge and went to hook it up yesterday actually but the spot on my down pipe for the 02 sensor seems to be too small for the 02 sensor itself and thats the only spot on my exhaust so I havta figure something out to get the settled. But I will definitely take all of that into consideration, thank you very much
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Old 03-14-2012, 12:20 PM   #20
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with everything said above would it not be a good idea to replace those V2 coilpacks as well? (GD wrx coilpacks)
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Old 03-14-2012, 01:17 PM   #21
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Agreed the USDM coilpacks are a good upgrade and solve alot of problems. They in many cases are quite a bit cheaper then getting new JDM coils. One must be willing and capable of doing some soldering but its totally worth it.
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Old 03-14-2012, 09:02 PM   #22
etidatreyu
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Yeah the previous owner of the car had it installed so I could get the USDM wrx coilpacks as well. Which, as you said I have heard is much better and cheaper than the V2 ones
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