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Old 06-09-2012, 07:27 PM   #1
Rodian
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Default Stg 2 Ap v1 CEL no code. Not building boost! Help!

Here is some background. The car has been throwing an P0457 code every other day or so. Today, it begins to stumble at cruising and throws a CEL.

Using my Cobb AP V1 - it says no trouble codes found!

Up until about 15-minutes ago it was boosting normally for what it was usually doing. (about 10psi) but now it makes all the normal spool sound but only gets to ambient or 0-bar and stops climbing.

It has Cobb SS turbo back no cats.
Catless up-pipe and eBay header.
Spt intake
Aftermarket wastegate actuator that should be stock rated but is slightly off. The vacuum feed is rotated from the normal placement. The vacuum line with restrictor pill has been replaced with normal vacuum line. Hope this enough to help.

I was told that the vacuum line connecting to the front intake manifold to some black thing may need replacing and can cause the P0457 code. Could it be that or the black thing robbing me of boost and giving me the mystery CEL??

Please help!
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Old 06-10-2012, 12:01 PM   #2
Cobb Tuning
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Originally Posted by Rodian View Post
Here is some background. The car has been throwing an P0457 code every other day or so. Today, it begins to stumble at cruising and throws a CEL.

Using my Cobb AP V1 - it says no trouble codes found!

Up until about 15-minutes ago it was boosting normally for what it was usually doing. (about 10psi) but now it makes all the normal spool sound but only gets to ambient or 0-bar and stops climbing.

It has Cobb SS turbo back no cats.
Catless up-pipe and eBay header.
Spt intake
Aftermarket wastegate actuator that should be stock rated but is slightly off. The vacuum feed is rotated from the normal placement. The vacuum line with restrictor pill has been replaced with normal vacuum line. Hope this enough to help.

I was told that the vacuum line connecting to the front intake manifold to some black thing may need replacing and can cause the P0457 code. Could it be that or the black thing robbing me of boost and giving me the mystery CEL??

Please help!
I would get a copy of the factory manual and go through the diagnostic procedure for P0457 -> usually this code is related to fuel cap issues or issues with the fuel tank emissions system.

Bill
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Old 06-13-2012, 12:31 AM   #3
Rodian
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Thanks for the reply. Since posting I have replaced the wastegate actuator as well as some vacuum lines. I reset the ecu via unplugging the battery for 10 minutes as well as reset via AP. I have driven it for two days and no CEL. No boost past .02 Bar either.

I ordered a mishimoto TMIC hose kit hoping one of my stock plastics had finally cracked and it's my whole problem. Fingers crossed.
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Old 06-13-2012, 09:35 AM   #4
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Originally Posted by Rodian View Post
Thanks for the reply. Since posting I have replaced the wastegate actuator as well as some vacuum lines. I reset the ecu via unplugging the battery for 10 minutes as well as reset via AP. I have driven it for two days and no CEL. No boost past .02 Bar either.

I ordered a mishimoto TMIC hose kit hoping one of my stock plastics had finally cracked and it's my whole problem. Fingers crossed.
A wide open throttle, you are seeing boost near 0 psig?
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Old 06-13-2012, 10:31 AM   #5
Rodian
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I haven't really tried to push it at WOT that much.(scared as its my daily) that and I'm not sure if the OTS stg2 map is best for my mods in addition to having a boost leak. In my ignorance I would hate to push things and cause more damage...It did manage to build up close to .06-.08 Bar on one 3rd gear pull but mostly it only gets to about .02 or so as of late with near WOT. The turbo sounds like its spooling fine and again 3rd day driving without irregular idle and no CEL.

Not sure I mentioned this the first time, but the restrictor pill is not in the t-fitted vacuum connections at the turbo, I'm on the stock ebcs. But previously I assumed that's what was limiting me to .08 Bar instead of the full .1bar prior to this whole big leak issue.
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Old 06-13-2012, 10:40 AM   #6
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Originally Posted by Rodian View Post
I haven't really tried to push it at WOT that much.(scared as its my daily) that and I'm not sure if the OTS stg2 map is best for my mods in addition to having a boost leak. In my ignorance I would hate to push things and cause more damage...It did manage to build up close to .06-.08 Bar on one 3rd gear pull but mostly it only gets to about .02 or so as of late with near WOT. The turbo sounds like its spooling fine and again 3rd day driving without irregular idle and no CEL.

Not sure I mentioned this the first time, but the restrictor pill is not in the t-fitted vacuum connections at the turbo, I'm on the stock ebcs. But previously I assumed that's what was limiting me to .08 Bar instead of the full .1bar prior to this whole big leak issue.
Sounds like you have the factory boost gauge - the units there would be megapascals (MPa), where 0.1 is about 14.5 psig (0.1 bar is about 1.5 psig).

I would get the restricter pill sorted out - being that it is missing would cause the low boost issues. If you also suspect a boost leak, then a pressure test of the intake tract is your best bet so you can conclusively identify where it is actually leaking.

Bill
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Old 06-13-2012, 10:48 AM   #7
Rodian
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Thanks, I figured I was messing that measurement up. But yeah, I have been looking for just the restrictor pill, my local dealer is lame cause theyre owned by a money hungry cadillac dealer.

Regarding doing the pressure test on the intake, what kind of tools would be involved? My lack of space and budget has me only buying tools as I need them. Do you suspect something more than the pill and Intercooler hoses? Maybe a bad ebcs?
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Old 06-13-2012, 12:10 PM   #8
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Originally Posted by Rodian View Post
Thanks, I figured I was messing that measurement up. But yeah, I have been looking for just the restrictor pill, my local dealer is lame cause theyre owned by a money hungry cadillac dealer.

Regarding doing the pressure test on the intake, what kind of tools would be involved? My lack of space and budget has me only buying tools as I need them. Do you suspect something more than the pill and Intercooler hoses? Maybe a bad ebcs?
I would just go down the line to the most likely issue (which most certainly is the missing pill) and then test. If that doesn't work, go to the next most likely issue and so on.

You would need an air compressor for a pressure test. There are various write-ups on Nasioc about this (search for DIY pressure test). You can get the components needed at any home improvement store.

Bill
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Old 06-13-2012, 02:57 PM   #9
Rodian
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Welp, I ordered a new pill. Drove to around on lunch and tested what it did at WOT. It boosted to .06 mpa a couple times but as the engine bay heat increased, the boost lost more pressure. By the end of lunch it wasn't holding pressure. This makes me think it's those intercooler hoses. How about yourself?

I guess we will confirm once the mishimoto y-pipe, throttle body hose, and bpv return hose( I think that's what it's called) will do the trick and or maybe the restrictor pill on Friday once that gets in. Thanks again for all the suggestions.
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Old 06-13-2012, 04:17 PM   #10
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Originally Posted by Rodian View Post
Welp, I ordered a new pill. Drove to around on lunch and tested what it did at WOT. It boosted to .06 mpa a couple times but as the engine bay heat increased, the boost lost more pressure. By the end of lunch it wasn't holding pressure. This makes me think it's those intercooler hoses. How about yourself?

I guess we will confirm once the mishimoto y-pipe, throttle body hose, and bpv return hose( I think that's what it's called) will do the trick and or maybe the restrictor pill on Friday once that gets in. Thanks again for all the suggestions.
You would have to have a pretty severe boost leak in order to be way off from your target on an extended run. Being able to data log would tell us a lot here. A drop in the dynamic advance multiplier (DAM) can cause the ECU to disable boost control - this can be intermittent even as the DAM stays low as there is a fine knock learning threshold that must be met. So, the boost can end up switching between no boost control and full boost control as the current fine knock learning value changes. Kind of matches what you are seeing, so another possibility (although a reset/reflash would eliminate this behavior temporarily until it happened again).

If you can't find any leaks (or your fix doesn't work), you might want to consider upgrading to the version 2 AccessPORT. We offer a $200 trade-in towards the purchase of one and you can data log from the device itself (as well as view the live data of any one of the numerous monitors). You will also be able to take advantage of the newer maps for 02-05 WRX. If that is not in the budget, I would at least get a cheap ebay cable that is compatible with the RomRaider open source software and gets some logs that way.

Bill
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Old 06-13-2012, 04:44 PM   #11
Rodian
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I see. Well, I have a friend with tactrix who may be able to pull some logs eventually. I will most likely have replaced the hoses and put the pill in its respective place by the time that could happen. I was on the fence about the upgrade, but your direct interest in my issue and suggestions swayed me back to cobbs good graces. I was so close to doing the swap but finances got hung up as we just bought my wife an 02 Wrx wagon we are reviving piece by piece.

Thanks again for all your help. I will be sure to post results once the fixes have been applied. If there were a person I could send kudos to with Cobb and your assistance it would be great. Thanks!
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Old 06-14-2012, 10:30 AM   #12
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I see. Well, I have a friend with tactrix who may be able to pull some logs eventually. I will most likely have replaced the hoses and put the pill in its respective place by the time that could happen. I was on the fence about the upgrade, but your direct interest in my issue and suggestions swayed me back to cobbs good graces. I was so close to doing the swap but finances got hung up as we just bought my wife an 02 Wrx wagon we are reviving piece by piece.

Thanks again for all your help. I will be sure to post results once the fixes have been applied. If there were a person I could send kudos to with Cobb and your assistance it would be great. Thanks!
No problem. Hope you get everything fixed!

Bill
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Old 06-24-2012, 12:28 AM   #13
Rodian
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Update,

The intercooler hoses have been replaced and restrictor pill in the vacuum line. Using the AP v1 I watched the live boost pressure (or rather my friend did) as we tested WOT. He states it hit 15psi at one point. However the factory gauge did not seem to reflect the same number. This seemed all good and well until the 3rd attempt in which it was followed by that aforementioned symptom in my original post where a CEL appears with "No Trouble Found!!" listed on the v1 scantool . Followed by a rough idle similar to that of when unplugging a vacuum line while the motor is running.

I'm out of my league regarding diagnostic prowess. But yeah. Mishimoto intercooler kit and factory placement of restrictor pill later. Overall achievable boost there. Factory gauge status is questionable. CEL with unreadable code for my v1 tuner
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Old 06-24-2012, 03:51 AM   #14
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Note that for data logging, the APV1 cable will work just fine with RomRaider, provided you have a laptop with a serial port... (or a USB->serial adapter).

Quote:
Originally Posted by Rodian View Post
Update,

The intercooler hoses have been replaced and restrictor pill in the vacuum line. Using the AP v1 I watched the live boost pressure (or rather my friend did) as we tested WOT. He states it hit 15psi at one point. However the factory gauge did not seem to reflect the same number. This seemed all good and well until the 3rd attempt in which it was followed by that aforementioned symptom in my original post where a CEL appears with "No Trouble Found!!" listed on the v1 scantool . Followed by a rough idle similar to that of when unplugging a vacuum line while the motor is running.

I'm out of my league regarding diagnostic prowess. But yeah. Mishimoto intercooler kit and factory placement of restrictor pill later. Overall achievable boost there. Factory gauge status is questionable. CEL with unreadable code for my v1 tuner
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Old 06-24-2012, 10:23 AM   #15
Cobb Tuning
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Quote:
Originally Posted by Rodian View Post
Update,

The intercooler hoses have been replaced and restrictor pill in the vacuum line. Using the AP v1 I watched the live boost pressure (or rather my friend did) as we tested WOT. He states it hit 15psi at one point. However the factory gauge did not seem to reflect the same number. This seemed all good and well until the 3rd attempt in which it was followed by that aforementioned symptom in my original post where a CEL appears with "No Trouble Found!!" listed on the v1 scantool . Followed by a rough idle similar to that of when unplugging a vacuum line while the motor is running.

I'm out of my league regarding diagnostic prowess. But yeah. Mishimoto intercooler kit and factory placement of restrictor pill later. Overall achievable boost there. Factory gauge status is questionable. CEL with unreadable code for my v1 tuner
Do you have TGV deletes? Some of those codes may not show up on v1 AP.

I forgot that the AP v1 cable will work with RomRaider if you use a serial to USB converter (make sure install the drivers). I think that would be your best bet. For the code, try going to a auto parts store that will read codes with an obdii scanner. Is this a solid CEL or blinking CEL?

Bill
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Old 06-24-2012, 02:39 PM   #16
Rodian
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The previous owner seems to have done things I'm unaware of. For instance, I'm not too sure where my downstream O2 sensor is connected. He may have bypassed that somehow. I thought that sensor was ignored in the stg 2 map. But I read it somewhere late at night and could be remembering wrong.

As far as the TGV deletes go, not sure there either. In my inexperience with Subaru I'm not sure what to look for.

The CEL is constant. I don't believe I've experienced a blinking CEL since ownership. The P0457 code took an entire week to present itself prior to replacing the intercooler hoses and installing the restrictor pill. Now that it seems to be more capable of producing boost, it is able to reproduce the unknown CEL easily and shortly after reset of the ecu. I guess the more achievable pressure with the changes made the original problem show itself. Now if I can just track that down
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Old 06-25-2012, 09:37 AM   #17
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Originally Posted by Rodian View Post
The previous owner seems to have done things I'm unaware of. For instance, I'm not too sure where my downstream O2 sensor is connected. He may have bypassed that somehow. I thought that sensor was ignored in the stg 2 map. But I read it somewhere late at night and could be remembering wrong.

As far as the TGV deletes go, not sure there either. In my inexperience with Subaru I'm not sure what to look for.

The CEL is constant. I don't believe I've experienced a blinking CEL since ownership. The P0457 code took an entire week to present itself prior to replacing the intercooler hoses and installing the restrictor pill. Now that it seems to be more capable of producing boost, it is able to reproduce the unknown CEL easily and shortly after reset of the ecu. I guess the more achievable pressure with the changes made the original problem show itself. Now if I can just track that down
I would definitely try to read it with an obdii scanner as a first step. Some auto parts stores will do this for free.

Bill
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Old 06-25-2012, 11:08 AM   #18
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Hooked it up to a professional scan tool at a foreign specialist shop and although the light remained lit and constant. The scan tool read no trouble found. We then looked into the code history as I had reset the ecu via the AP v1 when it failed to read the code to see how easily the light would reappear.

It only took a merge onto the interstate and it was back with " no trouble found". Anyway... The pro scan tool history search merited a P0130 O2 sensor bank 1 code stored in its history. Crazy cause the car had an exhaust leak from the previous owners negligent ghetto rig for the up-pipe connection. This resulted in a failed o2 that I replaced just a year ago for a denso sensor.
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Old 06-25-2012, 11:34 AM   #19
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Hooked it up to a professional scan tool at a foreign specialist shop and although the light remained lit and constant. The scan tool read no trouble found. We then looked into the code history as I had reset the ecu via the AP v1 when it failed to read the code to see how easily the light would reappear.

It only took a merge onto the interstate and it was back with " no trouble found". Anyway... The pro scan tool history search merited a P0130 O2 sensor bank 1 code stored in its history. Crazy cause the car had an exhaust leak from the previous owners negligent ghetto rig for the up-pipe connection. This resulted in a failed o2 that I replaced just a year ago for a denso sensor.
You may still have an issue with the front o2 sensor or associated wiring if you are showing a code history for it. That would have been cleared when you installed the AP, reflashed a map, reset the ECU via AP, or disconnected the car's battery. Unless you haven't done any of those procedures in the year since you've replaced the sensor, then likely it was thrown again.

Next step would be to get a data log. You can do this with RomRaider if you get the proper cable (or a good serial to USB converter for AP v1 cable).

Bill
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