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Old 02-04-2013, 04:00 PM   #1
Acuna989
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Default Shuttering in the low RPM's 2005 STi

I'm getting some crazy shuttering in the low RPM's. It almost feels like the whole engine is shaking on the frame. Also Ive notice a loss of low end power. I'm going to be putting it up in the garage this weekend. Looking for some helpful suggestions on some possible causes. I'm thinking it might be either the tune, warped flywheel, or the clutch. I recently replaced the engine and transmission mount and it didn't seem to make a difference.

2005 STi
Drivetrain/ Shifter:
ACT stage two Clutch
ACT streetlight
flywheel
Cartboy Short throw shifter
Beatrush transmission mount
Kartboy 6MT front shifter stay bushing
Kartboy rear shifter stay bushing
TiC 04/05 STi linkage bushings
TiC 6MT pivot bushings


Engine:
20G 8mm Turbo pushing 22psi
DEATSCH werks 850CC injectors
Perrin Fuel lines
Turbo XS TMIC
Water/ Alchole injection
Oversized air inlet hose
K&N short ram air intake
TGV deletes
1 Step colder
spark plugs
Synapse diverter valve
Moroso Top coolant/turbo overflow tank
Beatrush engine mounts



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Last edited by Acuna989; 02-04-2013 at 06:02 PM.
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Old 02-04-2013, 04:30 PM   #2
Ensubiastdjb
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First thing for a studering at low rpm/idle, clean or replace your MAF sensor. Fixed my idle no issue.
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Old 02-04-2013, 05:50 PM   #3
Acuna989
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^Thanks didn't even think of that. I'll give that a try after I get off work tonight. Hopefully I can find MAF cleaner locally.
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Old 02-04-2013, 06:43 PM   #4
Ensubiastdjb
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Advanced or auto zone has it.
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Old 02-04-2013, 08:24 PM   #5
Acuna989
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Found it at Osh Hardware. Going to clean the MAF up and reset the ECU. Got my fingers crossed!
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Old 02-04-2013, 10:56 PM   #6
Acuna989
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Well I Got some power back but the shuttering is still there when taking off into first. While its in neutral the engine kinda dips down and starts to knock. Oil pressure comes down to about 12-14. I hate not knowing what the issue is. Maybe its a vacuum leak. If it is, its nothing obvious.

I'm also having power steering issues when making hard turns, can this be related?

Last edited by Acuna989; 03-25-2013 at 04:50 PM.
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Old 02-04-2013, 11:28 PM   #7
Ensubiastdjb
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I doubt the power steering is in any way related.
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Old 02-04-2013, 11:33 PM   #8
smeerone
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Are u on e85?
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Old 02-04-2013, 11:47 PM   #9
Acuna989
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Quote:
Originally Posted by Ensubiastdjb View Post
I doubt the power steering is in any way related.
Ya me either, just kinda grasping at staws.....Guess ill check for exaust/vacuum leaks and the knock sensors on Wednesday ( my next day off) I know I have a small exaust leak somewhere cause I can smell it. This is what happens when you use a 20g STi as a DD. everything goes wrong at the same time.

I only have to drive it to work one more day and then I can garage it. I aquiered a 87 tercel wagon that Just needs to be smogged and registered to use as my new daily. F*%k I hope I don't blow my engine tomorrow.

If anyone has more suggestion I would appreciate it.

Last edited by Acuna989; 02-04-2013 at 11:57 PM.
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Old 02-04-2013, 11:50 PM   #10
Acuna989
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Originally Posted by smeerone View Post
Are u on e85?
Its tuned for 91- water/alcohol.
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Old 02-05-2013, 07:45 AM   #11
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Quote:
Originally Posted by Acuna989 View Post

Ya me either, just kinda grasping at staws.....Guess ill check for exaust/vacuum leaks and the knock sensors on Wednesday ( my next day off) I know I have a small exaust leak somewhere cause I can smell it. This is what happens when you use a 20g STi as a DD. everything goes wrong at the same time.

I only have to drive it to work one more day and then I can garage it. I aquiered a 87 tercel wagon that Just needs to be smogged and registered to use as my new daily. F*%k I hope I don't blow my engine tomorrow.

If anyone has more suggestion I would appreciate it.
I REALLY doubt it'll blow in one more day. I hear yah though I have issues out the ass right now with mine. I gave up after weeks of trial/error... Taking it to either Agile, IAG, or PTuning for them to do a full assessment and get it 100% mechanically, then tune it.
Check the uppipe. That's where I found my exhaust leak, right in the flex part of it. It looks like the prev owner threw on a POS header/uppipe kit, as it was literally falling apart when I took it off to find my leak. IMO, start there, up front.
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Old 03-25-2013, 05:01 PM   #12
Acuna989
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Finally had some time to take everything apart and inspect the exhaust gaskets. The only gaskets that were in good shape were the header gaskets. You cant really tell in the picture but the header to up pipe gaskets is actually warped, looks like it was about to break apart and get pushed up into the turbo lol dodged a bullet on that one! Got all grimmespeed gaskets for replacement, hopefully this solves my problem.

The car as it sits right now......

Last edited by Acuna989; 03-25-2013 at 05:33 PM.
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Old 03-26-2013, 12:25 AM   #13
jebjkey
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If there were problems with you clutch/flywheel being out of balance or warped, it would get worse as RPM's go up.

How do your spark look?

What are your AF Learning A, B, C, and D values?

Can you take a datalog when it is occuring?
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Old 03-26-2013, 10:32 AM   #14
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Quote:
Originally Posted by jebjkey View Post
How do your spark look?
I was planning on pulling them once I get my VC gaskets in the mail on Thursday. Im guessing there probably toast.

Quote:
Originally Posted by jebjkey View Post
What are your AF Learning A, B, C, and D values?
My AF gauge was going crazy and was all over the map before I pulled everything apart, figured my exaust leak was making it go crazy or my o2 sensor needs to be replaced. Guess Ill find out once I get it back together.

Quote:
Originally Posted by jebjkey View Post
Can you take a datalog when it is occuring?
Wish I could but I don't have access to a tacrix cable. I wouldn't really know what to do with the Data logs even if I had them. Just not there yet.
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Old 03-26-2013, 10:46 AM   #15
breakablecookie
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My STi also shudders at low RPM's but only on throttle, if I let off it goes away. This only seems to happen at anything below 2,500rpm. Its the same feeling as when my old celica would be revving too low and would start to bog but that only happened in that car at around 1,000rpm. I figured it was just because this is a turbocharged car but maybe you will find something I dont know. You did remind me to change all of my gaskets. Cheap to do and will give me some peace of mind
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Old 03-26-2013, 02:05 PM   #16
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Quote:
Originally Posted by breakablecookie View Post
My STi also shudders at low RPM's but only on throttle, if I let off it goes away. This only seems to happen at anything below 2,500rpm. Its the same feeling as when my old celica would be revving too low and would start to bog but that only happened in that car at around 1,000rpm. I figured it was just because this is a turbocharged car but maybe you will find something I dont know. You did remind me to change all of my gaskets. Cheap to do and will give me some peace of mind
Breakablecoockie- I saw that the last owner installed an 07 engine in your car. You might be having the same issue as me. In my case, subpar gaskets were used by the last owner when installing the exuast system. I'm not sure if he used the correct torque spec either. I would start at the simple stuff first because Ive spent about 120 in gaskets alone.

Last edited by Acuna989; 03-26-2013 at 03:29 PM.
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Old 03-27-2013, 01:20 PM   #17
Acuna989
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A closer look at the header to up-pipe gasket
Got everything wrapped, just waiting on the gaskets.
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Old 03-28-2013, 08:40 AM   #18
breakablecookie
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Quote:
Originally Posted by Acuna989 View Post
Breakablecoockie- I saw that the last owner installed an 07 engine in your car. You might be having the same issue as me. In my case, subpar gaskets were used by the last owner when installing the exuast system. I'm not sure if he used the correct torque spec either. I would start at the simple stuff first because Ive spent about 120 in gaskets alone.
Yeah now that its starting to get warm outside I should be able to jack up the car and do some good inspections of my gaskets. I might just end up replacing all of them just for peace of mind. If that fixes the problem then great but if not at least I still know I shouldnt have any exhaust leaks.

I'm honestly very impressed with how the car is running overall. Even with a boost leak and a worn out/leaking bov the car runs pretty solid and hasn't let me down yet.
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Old 03-28-2013, 02:46 PM   #19
gutie04
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Get those leaks fixed. Remember a boost leak could be an area where unmetered air is coming in when not in boost. Could cause worse issues.
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Old 03-28-2013, 03:22 PM   #20
Acuna989
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Quote:
Originally Posted by breakablecookie View Post
Yeah now that its starting to get warm outside I should be able to jack up the car and do some good inspections of my gaskets. I might just end up replacing all of them just for peace of mind. If that fixes the problem then great but if not at least I still know I shouldnt have any exhaust leaks.

I'm honestly very impressed with how the car is running overall. Even with a boost leak and a worn out/leaking bov the car runs pretty solid and hasn't let me down yet.
Where you getting your boost leaks? I have a stock DV if you want it.
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Old 04-03-2013, 12:43 AM   #21
breakablecookie
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I'm gonna be going to IAG Performance and have a professional leak test done. I'm not quite sure what you mean by "stock DV"
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Old 04-03-2013, 09:29 AM   #22
dave4097
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seems like fuel was a big issue with my STI i had to run high grade fuel or it had idle issuses, careful cleaning your MAF sensor you can damage it. Replacement is usually better.
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Old 04-03-2013, 06:08 PM   #23
Acuna989
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Just got everything put back together and its running great. No more shuttering! taking off in first is now enjoyable again. Thanks for all the input.
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Old 04-03-2013, 06:16 PM   #24
Acuna989
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Originally Posted by breakablecookie View Post
I'm gonna be going to IAG Performance and have a professional leak test done. I'm not quite sure what you mean by "stock DV"
Sorry, Stock diverter valve. When I first got my STi, the previous owner had a XS Blow off valve on the car and it was making the car run rich after shifting. I ended up going with a synapse DV, the car ran a lot better after the switch and it spools up a little quicker when shifting.
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Old 04-08-2013, 07:22 AM   #25
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Quote:
Originally Posted by Acuna989 View Post
Sorry, Stock diverter valve. When I first got my STi, the previous owner had a XS Blow off valve on the car and it was making the car run rich after shifting. I ended up going with a synapse DV, the car ran a lot better after the switch and it spools up a little quicker when shifting.
Interesting, mine also has an xs bov on it. I have a cobb xle bpv sitting around that I will be replacing it with. But I will need to save up for a new tune first to go along with it. My xs bov is leaking badly but the car still seems to run pretty smooth regardless which must have a lot to do with the amazing tune I have.

I sure will miss shooting fireballs out the back though! Running rich can be fun sometimes
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