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This is a discussion on Hesitation Problems..Please Read within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by Kelley725 My mechanic told me there are 2 cat's on my 02 WRX.He suggested taking out the ...

  1. #16
    UnBanned Sinister's Avatar
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    Quote Originally Posted by Kelley725 View Post
    My mechanic told me there are 2 cat's on my 02 WRX.He suggested taking out the cat at the turbo to prevent just that from happening. I have been having trouble with hesitation and jerking too. He also suggested switching the cold air intake back to stock. Any truth to all that helping? I'm a newbie and have had trouble posting my own thread on these issues.
    Your mechanic is wrong.

    There are 3 catalytic converters on the 02 WRX.

    One on the UP PIPE and 2 on the DOWN PIPE. The one on the UP PIPE can shatter under large volumes of exhaust, and this causes little metal particles to travel through the turbine wheel. Sometimes it's not an issue, but most times it's a big deal and the turbo suffers. You should take off the turbo and examine it. If it moves freely, there are no scars from metal, there isn't shaft play, there is no oil leakage, and no metal scraps in the turbo, then you can rule that out. But more than likely the turbo is done.

    My suggestion at this point? See if Blouche can rebuild it with a 19T compressor wheel, and get a turbo back exhaust and a tune.
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    Registered User Johnny V's Avatar
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    Update: Turbo/uppipe is out. Some tiny chips on the turbo fins, but nothing substantial. A very very tiny lateral shaft movement, again, nothing unordinary for a 70k mile turbo. The cat in the uppipe was intact, none missing.

    Now here's the unordinary part. When i was taking the bolts off the hotside/downpipe connection, I noticed that there were no nuts on the lower three studs.... I was like wtf... Either they worked themselves out, or they were never put on (my buddy put my turboback on when I was at work). This brings up the following question: Could the fact that only two bolts and one stud were holding the downpipe onton the hotside lead to the hesitating. I mean, it kinda makes sense since I would have quite the leak as boost increases. Nonetheless, I gutted the cat real well and will be putting everything back on tomorrow. I thought about putting the VF34 on, but I don't have the rest of the supporting mods yet.

    Thoughts?
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  4. #18
    Registered User Johnny V's Avatar
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    Update:
    Put it all back together, still hesitating... FAWK. Next culprit: injectors...
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    UnBanned Sinister's Avatar
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    Quote Originally Posted by Johnny V View Post
    Update: Turbo/uppipe is out. Some tiny chips on the turbo fins, but nothing substantial. A very very tiny lateral shaft movement, again, nothing unordinary for a 70k mile turbo. The cat in the uppipe was intact, none missing.

    Now here's the unordinary part. When i was taking the bolts off the hotside/downpipe connection, I noticed that there were no nuts on the lower three studs.... I was like wtf... Either they worked themselves out, or they were never put on (my buddy put my turboback on when I was at work). This brings up the following question: Could the fact that only two bolts and one stud were holding the downpipe onton the hotside lead to the hesitating. I mean, it kinda makes sense since I would have quite the leak as boost increases. Nonetheless, I gutted the cat real well and will be putting everything back on tomorrow. I thought about putting the VF34 on, but I don't have the rest of the supporting mods yet.

    Thoughts?
    If there was an exhaust leak.. then possibly.
    Kevin
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    Registered User Johnny V's Avatar
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    Next up..pressure test. I know I shouldve done it first. Im an ass. Lets hope I find a leak somewhere I didnt see.
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    Registered User Johnny V's Avatar
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    UPDATE: I did a pressure test and found a massive gash right where my turbo inlet hose meets the turbo. Air was gushing out of there. I will be installing a new turbo inlet and doing another pressure test.
    -2004 San Remo Red WRX Sedan-
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    UnBanned Sinister's Avatar
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    Quote Originally Posted by Johnny V View Post
    UPDATE: I did a pressure test and found a massive gash right where my turbo inlet hose meets the turbo. Air was gushing out of there. I will be installing a new turbo inlet and doing another pressure test.
    Bummer.. easy fix though
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    I took apart my manifold and did a "patch job" on the inlet. Its a temp fix while my new inlet gets here.. The car is almost hesitation free. Still does it a tiny bit, but nothing compared to before since i can pull free and row through the gears now. I hope that with the new inlet, the hesitation will drop to zero.
    -2004 San Remo Red WRX Sedan-
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  10. #24
    1x2
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    Subscribed- I'm hoping it's just the air hose. I love happy endings.

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    Registered User Johnny V's Avatar
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    UPDATE: Received my new inlet and installed it. Hesitation is gone!! The car pulls smooth and clear no matter which gear or what RPMs Im at. It's a beautiful thing!

    So a small cut in the stock inlet pipe is capable of wreaking havoc.... now you know
    -2004 San Remo Red WRX Sedan-
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    1x2
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    OK, I'm happy- glad it worked out

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    I was close...just the wrong end. Glad it worked out.

    Quote Originally Posted by YBNormal07 View Post
    Well, you've determined it is not a fuel problem, not a spark problem, so it has to be an air flow problem. In this case, sounds like exhaust flow, so yeah...lookin like the cat.
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