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Old 02-18-2017, 01:07 AM   #1
michaelsherrill15wrx
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Post 2015 wrx won't build any boost???

First a little about the car its a 2015 wrx with fa20dit has 24k miles starts and idles fine , i purchased the car at salvage auction so the front bumper and fender have been replaced. upon receiving car it had check engine light and i found the boost control solenoid was unplugged on the air intake just under the BOV once plugged back in CEL went away but The car still won't build any boost at all. i took it for a drive around the block and it barely reaches 1 psi around 4-5k rpm in any gear. i don't hear any strange noises the car just feels super sluggish and slow. I've replaced the boost control solenoid on the air intake and also the two boost control solenoids that are under the intake manifold and nothing has changed. The turbine wheel spins freely and doesn't have any play. Ive checked for Boost leaks but haven't found any. Ive also Tried resetting the ecu by unhooking battery also no change. Im at a loss on what it could be , hoping someone can point me in right direction.
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Last edited by michaelsherrill15wrx; 02-18-2017 at 01:29 AM.
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Old 02-18-2017, 02:36 AM   #2
TheSilentCircus
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Is the whole car stock? It may be silly but have you checked the actual intake itself? Filters are clean? nothing obstructing air?
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Old 02-18-2017, 08:21 AM   #3
biggy8481
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I feel like this car may have been previously modified. Perhaps before it went in to the auction, aftermarket parts were removed. Try to check routing of vacuum hoses to boost control solenoid and check for restrictor pill
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Old 02-18-2017, 11:09 AM   #4
michaelsherrill15wrx
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The car is completely stock doesn't appear to have been modified at all. Yes I have checked the vacuum line routing when I replaced the solenoids they are all connected to the right places and appear new still. I've also take off the intercooler and charge pipe and checked all connection points for any damage but found none. Yes the restrictor pill is still in place and lines to turbo all routed to correct places.I Have not changed the air cleaner it didn't appear very dirty , I figured it would be fine until I get the car up and going then I'll do the full service on it. I'm not sure a slightly dirty filter would cause no boost at all, would it? This is my first turbo car. Thanks for the responses!
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Old 02-18-2017, 11:56 AM   #5
snake32
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did you reset the computer once you got the stuff hooked up? car might be in limp mode
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Old 02-18-2017, 12:19 PM   #6
michaelsherrill15wrx
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yes I've tried resetting it multiple times since replacing solenoids, no change.
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Old 02-18-2017, 03:12 PM   #7
Daniel Dudley
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Blocked exhaust/melted cat.
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Old 02-18-2017, 08:03 PM   #8
michaelsherrill15wrx
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Would that cause zero boost?
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Old 02-18-2017, 08:19 PM   #9
GlarryHoodDIT
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How does it behave when cruising at low throttle when it's a vacuum, is it always sluggish or just once you start trying to get into boost?
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Old 02-18-2017, 08:20 PM   #10
tramp
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Sure. If the turbo can't exhale it won't work as designed.
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Old 02-18-2017, 09:27 PM   #11
michaelsherrill15wrx
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It idles good and Revs normally in neutral. Seems like it would bog down at all times if catalytic converter Was clogged up. Haven't drove it too much, didn't want to hurt the motor I'll take it down the street again and get back to you.
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Old 02-18-2017, 10:20 PM   #12
michaelsherrill15wrx
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Default Clogged catalytic converter

You guys were right! Upon driving it noticed it did bog down when barely taking off. So I unscrewed upper O2 sensor and did a quick take off in my short driveway and it hit 2.3psi so I believe the cat is the culprit after all. Before it was a stretch to even hit 1 psi.
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Old 02-21-2017, 12:08 PM   #13
bdubblu
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Wow... blocked up cat/exhaust would be a strange occurrence on an unmodified 2015. I'd suspect modifications if you find something like that.
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Old 02-21-2017, 12:27 PM   #14
That_Boosted_Life
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Not entirely sure if this will work since it is a salvage title, but you could replace the bumper and fender, then get it registered and inspected (if your state requires this) and take it to the dealer to try and figure it out under warranty. If it is the cat those warranties are good for 8-10 years depending on what state you live in. However, since the car is a salvage title i'm not entirely sure if warranties can still be honored. Could also be a bad O2 sensor, although that should give a CEL. Try also cleaning the MAF.

Also, do you know how long the car was sitting before it got auctioned off? I don't think this would result in zero boost, but gas goes bad after a few months so if the car was sitting maybe the ECU is trying to protect the engine by not allowing boost. Could also be pulling timing which would explain why it is sluggish. Who knows maybe the auction people filled it with 87 octane
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Old 02-21-2017, 01:08 PM   #15
michaelsherrill15wrx
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Yeah I suspect the accident it was in broke apart the cat. Upon taking the exhaust off I found pieces of it falling out the pipe. I'm sure the factory warranties are void since it is a salvaged vehicle. I've cleaned out all the exhaust and put it back together and the car builds 7 psi now. The front cat broke and I believe it plugged the secondary cat. Being in California I have to keep them so I found and ordered a used set. Hoping the new cats fix the issues.
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Old 02-21-2017, 01:12 PM   #16
Zcypot
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Has to be pre turbo, I think wastegate pressure is around 14psi.
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Old 02-21-2017, 01:19 PM   #17
mishapopa
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Quote:
Originally Posted by michaelsherrill15wrx View Post
Yeah I suspect the accident it was in broke apart the cat. Upon taking the exhaust off I found pieces of it falling out the pipe. I'm sure the factory warranties are void since it is a salvaged vehicle. I've cleaned out all the exhaust and put it back together and the car builds 7 psi now. The front cat broke and I believe it plugged the secondary cat. Being in California I have to keep them so I found and ordered a used set. Hoping the new cats fix the issues.
time to get a j pipe?

in all seriousness the turbo is probably pooched too
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Old 02-23-2017, 11:52 AM   #18
bdubblu
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Quote:
Originally Posted by mishapopa View Post
time to get a j pipe?

in all seriousness the turbo is probably pooched too
Yeah... I'd be doing a compression test also. Thinking about that material traveling through the system would make me curious.
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Old 02-23-2017, 01:31 PM   #19
Charlie-III
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Quote:
Originally Posted by bdubblu View Post
Yeah... I'd be doing a compression test also. Thinking about that material traveling through the system would make me curious.
How does CAT material get in engine other than pouring it into the intake?

I mean, maybe a clogged CAT stressed pistons or valves due to the blockage in the exhaust so a compression/leakdown test would be advisable.
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Old 02-23-2017, 10:43 PM   #20
bdubblu
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Quote:
Originally Posted by Charlie-III View Post
How does CAT material get in engine other than pouring it into the intake?



I mean, maybe a clogged CAT stressed pistons or valves due to the blockage in the exhaust so a compression/leakdown test would be advisable.


That's what I was going at... should have separated my thoughts.
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Old 02-24-2017, 12:29 AM   #21
michaelsherrill15wrx
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Yeah I ended up finding an oem j pipe and mid pipe and the car is back to normal. Makes 21psi now. Turbo seems fine. I didn't run the car much since the issue started. I don't think the turbo was harmed. The whole issue was caused by the catalytic converters failing and plugging up the exhaust pipe completely.
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Old 02-24-2017, 09:02 AM   #22
tramp
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If you haven't yet-CHANGE THE OIL!!!!!!
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Old 02-24-2017, 09:04 AM   #23
Charlie-III
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Quote:
Originally Posted by tramp View Post
If you haven't yet-CHANGE THE OIL!!!!!!
Why?.....
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Old 02-24-2017, 01:15 PM   #24
vapore0n
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always good on a used car, since the new owner doesnt know what type of maintenance was done prior.
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Old 02-24-2017, 03:18 PM   #25
tramp
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Quote:
Originally Posted by Charlie-III View Post
Why?.....
If you have to ask................

The damage you just repaired caused a great amount of heat retention in the turbo which didn't do the oil any good at all. At the very least it's cheap insurance.
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