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Old 01-29-2013, 09:18 AM   #1
breakablecookie
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Default Check engine light and weird A/F ratios

I have owned my 05 sti for a couple of months now and it has run without a problem until my latest highway trip to the Philly auto show. On the highway I did a 4th to 5th pull and at the top of 4th gear the car cut fuel and the check engine light came on.

Cobb ap said it was P0224 waste gate solenoid blah blah blah. Looked it up online and saw plenty of people with the problem but there was no clear answer of what to do.

Well I reset the engine reuoaded my tune and the car has been fine. But again today on the highway top of 4th gear it cut out again with the same code.

My question is what things should I look at first to rule out the problem? Boost solenoid? TPS? Boost leak?

I have also noticed my A/F ratio fluctuating much more than usual. It used to hang around 14.2 - 14.9 now it's 14.2 - 16.1 and the idle reflects this change as the idle will dip and then come back up. Other than these two issues drive ability is perfect!

My tune is for 21psi from sti Mikey. The car has bigger injectors, Waldo 225l fuel pump, one step colder plugs, intake, invidia catless downpipe, obx midpipe, skunk 2 exhaust, hallman manual boost controller and turbo xs bov.

Please help! This issue is really starting to bother me and since I haven't read any other post from people with the same exact issues its hard to know what to do.
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Old 01-29-2013, 09:24 AM   #2
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Vac line blew off somewhere possibly. Have u checked all connections?
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Old 01-29-2013, 09:27 AM   #3
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I'm almost positive I have a boost leak at the 90 degree elbow connecting from the turbo to the intercooler because I haven't hit peak boost in awhile and I can hear what sounds like a supercharged whine which would be air escaping somewhere. I already ordered a new elbow and two T-clamps. But would this boost leak have anything to do with the P0224 code?

People were saying that its caused by a boost spike but that shouldn't be the case since I can't even hit peak boost at the moment. Very confusing. I'm gonna try taking out the boost solenoid today and hit it with 12v to see if its functioning. If its broken should I get another stock one or can I just drop in an aftermarket?
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Old 01-29-2013, 09:29 AM   #4
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Quote:
Originally Posted by wrxlaunch View Post
Vac line blew off somewhere possibly. Have u checked all connections?
Checked all lines and they are zip tied tight
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Old 01-29-2013, 09:29 AM   #5
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Also forgot to mention the motor is from a 2006sti if that makes a difference
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Old 01-29-2013, 09:41 AM   #6
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When I get home today I'm gonna pull out the boost control solenoid and make sure its working, clean the MAF sensor, double check all vacuum lines, and make sure I have a solid connection with the wires leading to the TPS. Also read somewhere about a rubber stop under the gas pedal and if it isnt there, it could be the cause of the code but I doubt that since this doesnt happen during WOT pulls in lower gears
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Old 01-29-2013, 10:25 AM   #7
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What is the temperature outside? When it is cold the car will make a bunch more boost and if after reset the car runs fine until you do another high gear WOT pull it sounds to me like you are simply overboosting and your tuner should be able to sort out the issue. Just remember that during the summer months your car will want more boost and you should keep both tunes handy. Running summer and winter tunes is not unheard of.
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Old 01-29-2013, 10:33 AM   #8
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it was 36 degrees this morning and the car had completely warmed up by the time I did the WOT pull. Are you sure the cold weather will effect the boost levels that much?
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Old 01-29-2013, 10:40 AM   #9
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My stock 08 STi has overboosted a handful of times and everytime it has been cold (under 30). One of my race cars (944 Turbo) used to overboost on cold (under 50) track days. How are you logging? If you have an accessport just take a look at the boost level in the log and see if it is spiking past your tune limit.
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Old 01-29-2013, 10:42 AM   #10
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unfortunately I was not logging at the time but I will the next time i plan to do a 4th gear WOT pull. I also was not paying attention to the boost gauge so I have no ballpark idea of what I was running.

If it is simply just a boost spike what can I do to stop it from doing that?
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Old 01-29-2013, 10:46 AM   #11
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Sounds like you overboosted
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Old 01-29-2013, 10:52 AM   #12
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Quote:
Originally Posted by tuzzio View Post
Sounds like you overboosted
is there a way to stop the car from overboosting other than not going WOT in the higher gears?

I would ask STi Mikey for some input since he did the tune but his inbox is full
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Old 01-29-2013, 10:52 AM   #13
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Quote:
Originally Posted by breakablecookie View Post
unfortunately I was not logging at the time but I will the next time i plan to do a 4th gear WOT pull. I also was not paying attention to the boost gauge so I have no ballpark idea of what I was running.

If it is simply just a boost spike what can I do to stop it from doing that?
There are a few ways: Manual boost controller, a separate winter/summer tune and the easiest fix is not doing WOT pulls until it warms up. Haha. The last is not the best fix but it is effective, albeit not much fun.
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Old 01-29-2013, 11:30 AM   #14
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I have a manual boost controller and it should be set to 21psi. Shouldnt that stop me from overboosting? maybe its set wrong
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Old 01-29-2013, 12:32 PM   #15
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alright so on my way home from school I made sure to have the cobb ap logging the boost. Turns out I was peaking all the way to 24psi!!! No wonder it was cutting the fuel and giving the CEL since the boost target is only 21.7

So I pulled over, turned my boost controller down two full turns and now my highest recorded peak boost is 21.3psi in 3rd gear. Should I turn it down even more just to be safe or should that be enough? I didnt get to do a run again in 4th or 5th so its hard to say if I will go past 21.3 or not

But overboosting does seem to be the culprit here and the cold weather probably doesnt help

I'm still having my weird idle issue with fluctuating A/F ratio I dont think its normal for the idle to get a bit rough and for the A/F to jump to 16.1 I thought you want idle to be at 14.7 solid...
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Old 01-29-2013, 01:38 PM   #16
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can anybody explain my weird idling issue? Could it be bad plugs? The colder weather? dirty maf sensor?
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Old 01-29-2013, 03:30 PM   #17
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If you are running the stock internals I would be very careful. I have popped 3 #4 pistons so far and all with stock tune, maybe that is the problem but the pistons are showing their weakness. Did you notice the rough idle before or after overboosting. With the boost spiking to 26 psi more than a few times I would do a compression test to rule out any major issues. The test is pretty easy if you are going to check the plugs. Does it sound like the motor is skipping a beat when you start it, almost like the battery is dying? Either way I would turn the boost down to 15 or so until I found the causes of your symptoms.
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Old 01-29-2013, 03:37 PM   #18
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Quote:
Originally Posted by bddgsxr View Post
If you are running the stock internals I would be very careful. I have popped 3 #4 pistons so far and all with stock tune, maybe that is the problem but the pistons are showing their weakness. Did you notice the rough idle before or after overboosting. With the boost spiking to 26 psi more than a few times I would do a compression test to rule out any major issues. The test is pretty easy if you are going to check the plugs. Does it sound like the motor is skipping a beat when you start it, almost like the battery is dying? Either way I would turn the boost down to 15 or so until I found the causes of your symptoms.
I will make a youtube video of the idle and A/F ratio. The car runs absolutely fine and its only slightly odd at idle maybe I'm just being picky. No other CEL codes are coming up so I assume everything is fine besides the three times I overboosted and that boost was only hit for maybe a second before the ECU cut the fuel so I doubt there was any damage done
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Old 01-29-2013, 04:01 PM   #19
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well I just took the car out for a bit and let it warm up completely and I didnt have the crazy A/F ratio that I had this morning when I got to school. Now its staying very smoothly at 14.8 to 15.2 as opposed to the huge jumps I was getting before from 14.3 to 16.2 and lumpy idle.

The temperature outside now is 59 degrees and I'm guessing the cold had more to do with the weird idle than anything else. Especially since the car runs great through the rest of the rev range. It was in the 30s this morning and now that the air has warmed up it seems to be running great!
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Old 02-01-2013, 05:28 PM   #20
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So i figured out that my weird idling issue is due to my turboxs bov which I'm guessing is leaking. I placed my hand over the horn section of the BOV and there were times when it would try to suck my hand it which it shouldnt be doing. Needless to say I'm tired of this BOV anyway and I have ordered a cobb xle bpv. I will try running that in its hybrid mode first and if I still have an idle issue I will switch to full recirc mode.

If this doesnt end up being a fix to my problems I will still be happy to get rid of that obnoxious BOV. It was cool for awhile but now between the idle issues and running rich everytime I let off the throttle I would like to just go to something more tame and safe
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Old 02-07-2013, 11:38 AM   #21
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Installing my cobb xle bpv tomorrow. I also cleaned my MAF sensor as well as my filter and I did another check for boost leaks. I think eveything should be normal very soon
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Old 02-07-2013, 11:49 AM   #22
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Quote:
Originally Posted by breakablecookie View Post
I have owned my 05 sti for a couple of months now and it has run without a problem until my latest highway trip to the Philly auto show. On the highway I did a 4th to 5th pull and at the top of 4th gear the car cut fuel and the check engine light came on.

Cobb ap said it was P0224 waste gate solenoid blah blah blah. Looked it up online and saw plenty of people with the problem but there was no clear answer of what to do.

This menas you overboosted. Every tune has a specific psi that the map sensor reads that will cause the car to throw this code, this is a fail safe on the engine. Many people will experience this in cold weather since the air is denser. The ways to fix this are as follows:
A: get your tuner to raise the boost limit if you believe you are still boosting within a safe range.
B: lower the boost
C: Get an EWG in order to have better boost control (assuming you already have a 3-port EBCS)

Well I reset the engine reuoaded my tune and the car has been fine. But again today on the highway top of 4th gear it cut out again with the same code.

My question is what things should I look at first to rule out the problem? Boost solenoid? TPS? Boost leak?

I'm assuming you have a 3-port EBCS, if not get one right away and get it retuned. TPS? If you have a boost leak it would be not be making more then what the tune calls for, it would be making less.

I have also noticed my A/F ratio fluctuating much more than usual. It used to hang around 14.2 - 14.9 now it's 14.2 - 16.1 and the idle reflects this change as the idle will dip and then come back up. Other than these two issues drive ability is perfect!

This sounds like a typical drop is weather and therefore air density and the ECU suing A/F learning and correction to account for the fact that a slightly different A/F mixutre is needed in order to hit the targed ratio (14.7 at cruise). After some time of driving it should stabalize.

My tune is for 21psi from sti Mikey. The car has bigger injectors, Waldo 225l fuel pump, one step colder plugs, intake, invidia catless downpipe, obx midpipe, skunk 2 exhaust, hallman manual boost controller and turbo xs bov.

Please help! This issue is really starting to bother me and since I haven't read any other post from people with the same exact issues its hard to know what to do.

Hope that helps.
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Old 02-08-2013, 03:13 PM   #23
breakablecookie
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well I have a much bigger problem now.

I got my cobb bpv but when I went to install it I found out that I had an aftermarket bpv recirculation hose in the car that was about an inch and a half too short. Subaru didnt have the hose so I had to go to pepboys and find a hose that would work. I managed to fit a hose into the car and barely hook it up to the new bpv.

I put everything back together tight and double checked just to make sure I didnt forget anything. Turned the car on and it has a horrible idle and the air fuel ratio fluctuates like CRAZY! I'm gonna post a video of this so maybe somebody can help me.

Now the car had a turboxs BOV on it before. Would it make a huge difference in the tune going from a BOV to a BPV?
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Old 02-08-2013, 03:19 PM   #24
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Old 02-08-2013, 03:39 PM   #25
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took it for a quick drive around the block it seemed to drive fine but if I start building boost the A/F ratio gauge goes to 10.0 flat and I have never seen that before. Why would putting on this new bpv cause something like this? Do I need a new tune now?
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