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Old 06-30-2006, 04:18 PM   #1
Buddhamonk
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Default 02 Wrx Wastegate Problem

I have an HKS EVC ver. 4, running 18 lbs of boost. When I stay in full boost for more than 5 seconds, the car lurches once, and the CEL comes on. Code reads Wastegate Actuator, but I'm not sure if it's high or low.

I have the stock actuator solenoid disconnected when I use the EVC.

Took the EVC off, put stock actuator solenoid back on, and the car only builds 7 lbs of boost. Car does not lurch, though.

The local dealers are all telling me I have to replace the whole turbo to replace the actuator (not the solenoid), but the factory service manual gives R&R instructions.

Should I replace the turbo? Can someone tell me where I can get a replacement actuator? Is this really even a turbo/actuator issue?

Any ideas?
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Old 06-30-2006, 04:22 PM   #2
hondaeater69
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the CEL is an overboost code, you're overboosting the stock map, the lurch you are having is from fuel cut. What is an HKS EVC? Some kind of boost controller i'm guessing. When you took the EVC off you probably lose the stock pill and that's why you only got 7 lbs. I suggest turning the BC down, or go get it professionally tuned.
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Old 06-30-2006, 04:23 PM   #3
dvang
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ive said this maybe 8 times in 2 days now -sigh

your hitting wastegate pressure 7lbs

its either your hose routing or your missing the restricter pill in the wastegate line at the turbo

search my post to find a link to the diagram of how its supposed tp look

and you dont need to replace the turbo
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Old 06-30-2006, 09:37 PM   #4
yosemitemtb
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Quote:
Originally Posted by dvang
ive said this maybe 8 times in 2 days now -sigh

your hitting wastegate pressure 7lbs

its either your hose routing or your missing the restricter pill in the wastegate line at the turbo

search my post to find a link to the diagram of how its supposed tp look

and you dont need to replace the turbo
Any ideas for a car that's running the stock turbo, stock restrictor pill and stock hose routing? I also replaced the waste gate solenoid as suggested here http://www.wrxforum.com/cgi-bin/ulti...=009470#000001

I hit 7 or 8 psi, but sometimes I hit full boost, it seems very intermittent.
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Old 07-01-2006, 12:20 AM   #5
Hallis
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Could it be carbon build up?

Might be a leaky hose. How many miles are on the car?
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Old 07-01-2006, 01:08 AM   #6
yosemitemtb
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77k miles on the car, an '02 wagon, Cobb stage 2 Accessport with no problems since about 35k miles. All the hoses look fine. I'm beginning to think it's an issue where the ecu is pulling the multiplier down. Recently I wasn't hitting target boost, only about 13 psi so I tightened up the wastegate arm a little and was hitting just over 15psi, just about perfect for the tune I have. two weeks later I get the new problem. I'm going to try an ecu reset tomorrow and see if that helps at least temporarily, I'm also going to back off my waste gate arm adjustment.
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Old 07-01-2006, 10:14 AM   #7
yosemitemtb
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reset ecu, returned waste gate arm to original setting (it was shortened one and a half turns) and I'm hitting about 14psi. I'll take the car on a longer drive later and see what happens, when this all started (very low pressure) the car would boost fine for up to an hour, then drop to waste gate pressure.
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Old 07-08-2006, 05:20 PM   #8
Buddhamonk
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So, just to make sure I have this right, the restrictor pill goes in the vacuum line between the boost controller and the wastegate? My local dealer is denying any knowledge of a stock restrictor pill.
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Old 07-08-2006, 05:28 PM   #9
Cyclops
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Should be three hoses coming from that tee. Put it in the one thats NOT going to the solenoid and NOT going to the actuator. Should be in the real short one that points towards the drivers side of the car.
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Old 07-08-2006, 09:55 PM   #10
Buddhamonk
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ok, with an hks evc version 4, that'd be the 4mm hose that goes to the BOV? I'm just afraid that it will affect the BOV. If that's true, do I need to put the pill between the BOV and the manifold? Also, is there a particular size pill? I bought 3 check valves from the local aquarium supplier, but I'm not real keen on using them. Luckily (i think), I found a "vacuum restrictor" at the local Autozone, but I'm also kind of hesitant to put it in.
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Old 08-20-2013, 11:16 PM   #11
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Any chance in bringing this back to life? I've searched all posts of dvang's trying to find this diagram he speaks of and can't find nothing! I'm only hitting 8lbs of boost...I think I have a problem with my vacuum hoses but i can't find a diagram to save my life! I bought this 02 WRX...bought a Cobb 3 port...when I went to install it I noticed that the factory boost solenoid wasn't even hooked up...there was a T between the WG (adjustable arm on this WGA I might add) and compressor housing nipple that ran over to a hose that T'd off going to a GReddy boost gauge and the other side of the T has a hose that runs down and enters right at the throttle body. I left the hose connected to the gauge that runs from the throttle body and capped the end that ran to the WGA & Compressor housing...then ran the 3 port solenoid according to instructions and i'm getting crap for boost.

Funny thing, I found a picture on here that showed a boost gauge install, and it had a T in the picture...one side of the T went to the boost gauge and the other side went to that surge valve looking thing that's on the TMIC (I think it's what a recirculating BOV replaces...or you put a block off plate on this particular thing when using a BOV)....that weirded me out. Please forgive my ignorance I'm new to WRXs...I'm a former Neon SRT4 owner and it was fast...I want this WRX to SMOKE that Neon!!!
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Old 08-21-2013, 12:04 AM   #12
DZXN
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Link to cobbs description of the OEM boost control system.

http://www.cobbtuning.com/Technical-...es-s/70674.htm

Also this might help

http://forums.nasioc.com/forums/show....php?t=2205161

The valve on the TMIC is your bpv and it sends the metered air back to the system. It is the same spot a bov will go if you wanted the noise.
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Old 08-21-2013, 02:33 PM   #13
cashedwrx
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Quote:
Originally Posted by DZXN View Post
Link to cobbs description of the OEM boost control system.

http://www.cobbtuning.com/Technical-...es-s/70674.htm

Also this might help

http://forums.nasioc.com/forums/show....php?t=2205161

The valve on the TMIC is your bpv and it sends the metered air back to the system. It is the same spot a bov will go if you wanted the noise.
Thanks! that's kind of what I figured about the BPV just wasn't sure what to call it...I'm firing off the hip here just going off what I know from owning turbo charged cars and then playing guess work then checking the forums....

I know I'm hitting the default pressure of the WG spring...that's established...why I'm not hitting my target boost is what's getting me. I need to get a vacuum diagram that really spells it out..I found one and I'm really trying to use it to figure my problem out! I've tried one of the set ups and it didn't work and it makes me think my problem may be something with the T that i capped off ..

Check this out...I have a MBC..so I used the diagram on this link for a MBC and it is still only hitting 7 PSI!!!



http://www.clubwrx.net/forums/tuning...ml#post2934874

I do have a Cobb Accessport, Cobb up pipe, Cobb down pipe & cat back combo, k&n filter, Cobb 3 port solenoid...car came with GReddy Boost gauge and GReddy Ext Temp gauge...not sure if mods would cause this issue...
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Old 08-21-2013, 02:37 PM   #14
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Quote:
Originally Posted by cashedwrx View Post
Thanks! that's kind of what I figured about the BPV just wasn't sure what to call it...I'm firing off the hip here just going off what I know from owning turbo charged cars and then playing guess work then checking the forums....

I know I'm hitting the default pressure of the WG spring...that's established...why I'm not hitting my target boost is what's getting me. I need to get a vacuum diagram that really spells it out..I found one and I'm really trying to use it to figure my problem out! I've tried one of the set ups and it didn't work and it makes me think my problem may be something with the T that i capped off ..

Check this out...I have a MBC..so I used the diagram on this link for a MBC and it is still only hitting 7 PSI!!!



http://www.clubwrx.net/forums/tuning...ml#post2934874

I do have a Cobb Accessport, Cobb up pipe, Cobb down pipe & cat back combo, k&n filter, Cobb 3 port solenoid...car came with GReddy Boost gauge and GReddy Ext Temp gauge...not sure if mods would cause this issue...
Also, the WGA has an adjustable arm..not sure if that's stock...on my other turbo charged cars they didn't have the adjustable arm you had to buy an aftermarket IWGA that had the adjustable arm to set a preload
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Old 08-21-2013, 04:14 PM   #15
DZXN
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How did you run the hoses for the mbc? When you plumbed for the mbc did you notice an arrow or anything denoting wastegate or arrows pointing one way? If it's a working mbc, installed correctly and still only hitting 7# of boost I'm confused. You could have a bad wg actuator. Unless the mbc is set for 7#.

What T did you cap off? The compressor to T to wastegate actuator and boost control solenoid?

The wg actuator on a td04 is adjustable from the factory, and if you take the clip off there should be some tension on the arm holding the wastegate closed. Not a ton, but some. If you do decide to check it make sure you don't lose the clip, it disappears real quick.

If
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Old 08-21-2013, 08:17 PM   #16
cashedwrx
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Problem solved thank you Jesus! I knew there was something funny about that T I capped off...I ran it up and T'd it between the BPV and the boost gauge hose and I'm hitting target boost! I found this thread and checked out the pictures and when I saw them..it only solidified my thoughts about what I needed to do. It ran like a bat out of hell for about 10 min then I popped a hose somewhere...the dreaded yet inevitable boost leak!

Here's the pics that helped me solve this particular issue..

http://forums.nasioc.com/forums/show...ight=bpv+hoses

Side note...I have strong feelings of animosity for the person I bought this car from. He attempted to do a few things and now I'm having to reverse engineer his screw ups...I hope this is the last thing! I'm only an additional $700 into the car!!! Good thing I got this ride at a STEAL!
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