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Old 01-11-2009, 11:51 PM   #1
Red Rexx
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Exclamation * Calling All Specialists & Gurus: Help Me Diagnose My Strange STi Engine Problem! *

*** Fixed! Silly coolant leak ! ***

Thanks guys!
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Last edited by Red Rexx; 04-27-2009 at 12:34 PM.
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Old 01-12-2009, 02:01 AM   #2
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No one can enlighten me?
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Old 01-12-2009, 03:06 AM   #3
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o.O there can be so many random, tiny little things that'll cause such a small loss (15HP) temporarily.... I'm scared to even make a suggestion.
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Old 01-12-2009, 06:49 AM   #4
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I would be worried about the bits of metal in the oil. That doesn't sound too good.
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Old 01-12-2009, 08:10 AM   #5
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Spark breakup can cause some similiar problems. Have you pulled your plugs to look at them? When was the last time they were replaced?

-Duncan
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Old 01-12-2009, 08:59 AM   #6
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Quote:
Originally Posted by dunk View Post
Spark breakup can cause some similiar problems. Have you pulled your plugs to look at them? When was the last time they were replaced?

-Duncan

Post #1, Red Rexx mentioned that P&L replaced them.
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Old 01-12-2009, 09:30 AM   #7
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Quote:
Originally Posted by jlcSTi View Post
Post #1, Red Rexx mentioned that P&L replaced them.

Good catch. Don't know how I missed that. Might be a coil issue as well.

-Duncan
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Old 01-12-2009, 09:37 AM   #8
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I'm thinking it's a coil issue as well. We have seen some very strange interference with electronic devices when the coils start to act up.

Tony
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Old 01-12-2009, 10:04 AM   #9
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Quote:
Originally Posted by dunk View Post
Good catch. Don't know how I missed that. Might be a coil issue as well.

-Duncan
NBD, happens to all of us.


Could the coils be the reason for the 15HP loss?

Did he change the oil, or the plugs first?
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Old 01-12-2009, 11:00 AM   #10
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If there were little metal bits in the oil, the filter should be packed full of em - cut it open!
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Old 01-12-2009, 11:07 AM   #11
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Unfortunately there is no history on the car (was purchased used with no compression test done prior). From what I can gather, my thoughts on the EKG plot are this:

Its either electrical/ignition.

Or it has to be compression.

Its too rhythmic to be otherwise.

Now, the metal flake and shards in the oil...

That's a completely different problem.

Ultimately, what it boils down to is just how much time and effort the OP wants to put into diagnosing it. Replace coils, start checking grounds, or harness, etc...

That's why I'll NEVER buy a used performance car.

-Jorge
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Old 01-12-2009, 11:13 AM   #12
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Quote:
Originally Posted by P&L Motorsports Inc. View Post
Now, the metal flake and shards in the oil...
Well, I think the oil analysis should be a must do for the OP At least that he'll know what type of metal it is.

-Duncan
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Old 01-12-2009, 12:52 PM   #13
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Quote:
Originally Posted by P&L Motorsports Inc. View Post
Unfortunately there is no history on the car (was purchased used with no compression test done prior). From what I can gather, my thoughts on the EKG plot are this:

Its either electrical/ignition.

Or it has to be compression.

Its too rhythmic to be otherwise.

Now, the metal flake and shards in the oil...

That's a completely different problem.

Ultimately, what it boils down to is just how much time and effort the OP wants to put into diagnosing it. Replace coils, start checking grounds, or harness, etc...

That's why I'll NEVER buy a used performance car.

-Jorge
Thanks again for all the help Jorge. I'm going to try to diagnose this a little more before we put the car back to stock. I called Ty today and asked him to pause the "return back to stock."
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Old 01-12-2009, 12:53 PM   #14
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Quote:
Originally Posted by jlcSTi View Post
NBD, happens to all of us.


Could the coils be the reason for the 15HP loss?

Did he change the oil, or the plugs first?
I am not sure honestly. I will check into that. Any info on it Jorge or if we can somehow analyze what material the debris in the oil was?

Also, what are the possible reasons why there can be debris like the metal in the oil?
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Old 01-12-2009, 07:12 PM   #15
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Quote:
Originally Posted by Red Rexx View Post
I am not sure honestly. I will check into that. Any info on it Jorge or if we can somehow analyze what material the debris in the oil was?

Also, what are the possible reasons why there can be debris like the metal in the oil?
Dude!! A million things could be wrong man, i feel bad for you. You should have just done the tbe and mbc. When people add many parts at once it usually takes some time to sort out both mechanicaly and on the dyno.

You told me a few of your threads ago that you were gonna go with an agressive tune, maybe the tuner went a little too agressive with timing at peak torque and damaged the motor. Not saying anything bad about the tuner, but when your trying to extract good power from a baby turbo things can go wrong.

Tbe, mbc, some good gas, and you'll be flyin on the stocker man...

Good luck, hopefully the problem is something non-complicated and you can be up and running for opening day at the track.

Last edited by STi Mikey; 01-12-2009 at 07:18 PM.
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Old 01-12-2009, 07:27 PM   #16
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Quote:
Originally Posted by STi Mikey View Post
Dude!! A million things could be wrong man, i feel bad for you. You should have just done the tbe and mbc. When people add many parts at once it usually takes some time to sort out both mechanicaly and on the dyno.

You told me a few of your threads ago that you were gonna go with an agressive tune, maybe the tuner went a little too agressive with timing at peak torque and damaged the motor. Not saying anything bad about the tuner, but when your trying to extract good power from a baby turbo things can go wrong.

Tbe, mbc, some good gas, and you'll be flyin on the stocker man...

Good luck, hopefully the problem is something non-complicated and you can be up and running for opening day at the track.


Sorry... but I had to.
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Old 01-12-2009, 11:30 PM   #17
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Quote:
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Sorry... but I had to.
I don't think you tuned it aggressively Jorge, ESPECIALLY on the 93. I said you can go slightly more aggressive on the 100 octane map since it would be ran rarely. We didnt even get to do the 100 octane map at all...

How could you tune it aggressively if you changed the oil and found this BEFORE the tune? That wouldnt make sense...
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Old 01-12-2009, 11:46 PM   #18
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like this?



that was a good run. on one run there was a 60 whp dip from a bad misfire. watch the vid below, same thing but much worse on the street. does your boost fluctuate? sounds like a weak coil to me.

http://www.youtube.com/watch?v=04AFXNnPSwY
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Old 01-13-2009, 01:03 AM   #19
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Quote:
Originally Posted by n2oiroc View Post
like this?



that was a good run. on one run there was a 60 whp dip from a bad misfire. watch the vid below, same thing but much worse on the street. does your boost fluctuate? sounds like a weak coil to me.

http://www.youtube.com/watch?v=04AFXNnPSwY
Great post!

Any word Jorge?
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Old 01-13-2009, 01:13 AM   #20
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the crappy part is you pretty much have to get ahold of some known good coils and rotate all the old ones out. i just got some new coils to try then my turbo blew so i still dont know if mine is fixed or not. you can do a few things to diagnose the issue without tossing more money into it. how does the car run/drive? power good on top or does it fluctuate?
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Old 01-13-2009, 11:24 AM   #21
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Quote:
Originally Posted by Red Rexx View Post
I don't think you tuned it aggressively Jorge, ESPECIALLY on the 93. I said you can go slightly more aggressive on the 100 octane map since it would be ran rarely. We didnt even get to do the 100 octane map at all...

How could you tune it aggressively if you changed the oil and found this BEFORE the tune? That wouldnt make sense...
Exactly...

We never even got more then one or two exploratory pulls (partial at that) into the 93 map.

-Jorge
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Old 01-13-2009, 11:25 AM   #22
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Dave: Jup, that's what I'm thinking. Either a coil or plug issue. The bottom end decay is a completely different problem. But, if this car was misfiring over time (with the prior owner), it is very possible its been pounding a bearing away.

-Jorge
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Old 01-13-2009, 12:56 PM   #23
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Quote:
Originally Posted by RiftsWRX View Post


Sorry... but I had to.


Why the rolleyes Jorge? I never mean and especially in this case did not impose anything derogatory. It was not specified if the shrapnel in the oil
was a problem before or after the few pulls. Based on a previous thread, Redd stated that he would receive an aggressive tune from you, and in all my time at the dyno it is apparent that the evo can take more high rpm knock than an STi during troubleshooting. Its not rare for these motors to pop under aggressive conditions, again, the conditions not being specfied.

I meant nothing by my post, I was just curious. I'm actually interested to see how this car does in the long run. You can tell by my profile I'm a firm believer in the STi's baby snail, and I love seeing people make progress with it.

Sorry if I came off wrong, and I hope all gets sorted out soon.
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Old 01-13-2009, 01:06 PM   #24
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Tbe and Mbc.
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Old 01-13-2009, 01:34 PM   #25
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Quote:
Originally Posted by n2oiroc View Post
the crappy part is you pretty much have to get ahold of some known good coils and rotate all the old ones out. i just got some new coils to try then my turbo blew so i still dont know if mine is fixed or not. you can do a few things to diagnose the issue without tossing more money into it. how does the car run/drive? power good on top or does it fluctuate?
The car ran perfectly normal to me prior to bringing it in. It felt normal, actually better than normal. It pulled like a BEAST with just the OTS AP Stage 2 map.

Jorge said the power on top was very good. It was doing 330wtq BEFORE tuning on a baseline running 93 octane. He never told me the whp number. That's damn good IMHO though and im not being biased...

Any input based on that?
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