Hesitation Problems..Please Read
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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; Ok fellas, here we go. I am having some serious hesitation issues with my 04 wrx with 67k miles. When ...

  1. #1
    Registered User Johnny V's Avatar
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    Hesitation Problems..Please Read

    Ok fellas, here we go. I am having some serious hesitation issues with my 04 wrx with 67k miles. When I get out of vacuum and into boost, it feels like Im pulling a trailer. I hit full boost and I go nowhere. It used to only happen a lil, now it happens 90% of the time, in every gear. Sometimes it won't happen and it will pull hard and normal. Here is the history:



    Car had a TBE for about a year running stock boost..zero issues



    Car was demodded and ran full stock for about 6 months..zero issues



    A week before deciding to keep her, I feel a TINY bit of hesitation under full boost



    A week later, I put the TBE back on..problem worsens slightly

    Over the course of the past month, it has gotten bad.. to the point where sometimes a few backfires come out of the exhaust.

    No CELs at all this entire time. No smoke whatsoever. No funny smells. No oil in coolant. I have, however, noticed a different noise coming from my fuel pressure regulator. When I turn the key and the fuel pump primes, a "swoosh/light gurgle" comes from the FPR. I put my finger on it and can feel it moving in union with the noise. Now here's the thing, I can't remember if it did that before. I don't ever remember hearing it like that.



    What I've done so far:



    Changed plugs to BKR6Es

    Visually checked coilpacks and they look perfect

    Did a compression test. Results: 155, 155, 155, 160

    New vac lines to from turbo to BC to WG actuator

    Checked stock BPV, perfect..zero leaks.

    Replaced air filter

    Cleaned MAF thoroughly and cautiously

    Visually checked intercooler, looks fine.

    Removed and reinstalled intercooler, making sure that every harness, clamp, etc.. was perfect.

    Visually checked turbo inlet and BPV return hose..look fine

    Ran through 3 tankfulls of 93 Octane gas, zero issues with gas

    Checked grounding points..all tight and clean

    New battery

    Looked at the FPR..no leaks..no smell of gasoline, clean connections



    What I haven't done/suspect:



    I havent done a pressure test

    I havent done a leakdown test (really dont think I need to)

    I havent checked the injectors (they are stock and have never been touched)

    I havent checked the fuel pump (my biggest suspect right now)





    Now, I know some may say I need a tune, but I ran like this for a long time without issues. I do need a tune and will be getting one soon, but I need to resolve this issue before then. This problem only happens when I enter boost. At 0psi and vacuum, the car is perfect. In second gear I can get it to break out of hesitating by getting off the gas and back on a lil, then it seems to push past the hesitation and pulls free and hard. It idles like a charm and when it doesn't hesitate, it runs super smooth. If i can think of anything else, Ill post up right away.
    -2004 San Remo Red WRX Sedan-
    Blobeye Syndicate #24

    "Pain of Discipline or Pain of Regret..take your pick." ~ Notre Dame

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    Quote Originally Posted by Johnny V View Post
    Ok fellas, here we go. I am having some serious hesitation issues with my 04 wrx with 67k miles. When I get out of vacuum and into boost, it feels like Im pulling a trailer. I hit full boost and I go nowhere. It used to only happen a lil, now it happens 90% of the time, in every gear. Sometimes it won't happen and it will pull hard and normal. Here is the history:



    Car had a TBE for about a year running stock boost..zero issues



    Car was demodded and ran full stock for about 6 months..zero issues



    A week before deciding to keep her, I feel a TINY bit of hesitation under full boost



    A week later, I put the TBE back on..problem worsens slightly

    Over the course of the past month, it has gotten bad.. to the point where sometimes a few backfires come out of the exhaust.

    No CELs at all this entire time. No smoke whatsoever. No funny smells. No oil in coolant. I have, however, noticed a different noise coming from my fuel pressure regulator. When I turn the key and the fuel pump primes, a "swoosh/light gurgle" comes from the FPR. I put my finger on it and can feel it moving in union with the noise. Now here's the thing, I can't remember if it did that before. I don't ever remember hearing it like that.



    What I've done so far:



    Changed plugs to BKR6Es

    Visually checked coilpacks and they look perfect

    Did a compression test. Results: 155, 155, 155, 160

    New vac lines to from turbo to BC to WG actuator

    Checked stock BPV, perfect..zero leaks.

    Replaced air filter

    Cleaned MAF thoroughly and cautiously

    Visually checked intercooler, looks fine.

    Removed and reinstalled intercooler, making sure that every harness, clamp, etc.. was perfect.

    Visually checked turbo inlet and BPV return hose..look fine

    Ran through 3 tankfulls of 93 Octane gas, zero issues with gas

    Checked grounding points..all tight and clean

    New battery

    Looked at the FPR..no leaks..no smell of gasoline, clean connections



    What I haven't done/suspect:



    I havent done a pressure test

    I havent done a leakdown test (really dont think I need to)

    I havent checked the injectors (they are stock and have never been touched)

    I havent checked the fuel pump (my biggest suspect right now)





    Now, I know some may say I need a tune, but I ran like this for a long time without issues. I do need a tune and will be getting one soon, but I need to resolve this issue before then. This problem only happens when I enter boost. At 0psi and vacuum, the car is perfect. In second gear I can get it to break out of hesitating by getting off the gas and back on a lil, then it seems to push past the hesitation and pulls free and hard. It idles like a charm and when it doesn't hesitate, it runs super smooth. If i can think of anything else, Ill post up right away.
    Same issues with me!!!

  4. #3
    Registered User wrxlaunch's Avatar
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    fuel pump going bad or dirty injuectors maybe???
    VF-43 Bugeye: OPEN SOURCE tune... 121xxx miles

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    Registered User Spencer3636's Avatar
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    or a simple ECU reset, you really never know. I would give it a shot, it only takes 30 seconds.
    Carpe Diem!

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    Registered User Johnny V's Avatar
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    Quote Originally Posted by Spencer3636 View Post
    or a simple ECU reset, you really never know. I would give it a shot, it only takes 30 seconds.
    I did that too, twice actually. forgot to list it, lol.
    -2004 San Remo Red WRX Sedan-
    Blobeye Syndicate #24

    "Pain of Discipline or Pain of Regret..take your pick." ~ Notre Dame

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    Registered User ZACK777's Avatar
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    I would replace the fuel filter, and also if the car is jerking or missing at all when it hesitates check to make sure the crank position sensor is not faulty (<-- fixed my hesitation missing problem)
    GL
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    Moderator YBNormal07's Avatar
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    Fuel filter, crap in the tank, or a screwed up linkage to your waste-gate. Check this first. If the linkage is loose or screwy, you wouldn't know it without seeing it.

    Fuel filter is the easiest.

    If crud is in your tank, replacing the fuel pump may resolve it.

    Did you check MAF sensor connections and made sure the MAF is clean? I seem to remember something about cleaning the EGR when power loss occurs too....anyone else remember this?

    The good ole oxygen-fuel-spark triangle and troubleshooting it...dontchajustloveit
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    Registered User Johnny V's Avatar
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    Update: Replaced fuel filter. No change.
    -2004 San Remo Red WRX Sedan-
    Blobeye Syndicate #24

    "Pain of Discipline or Pain of Regret..take your pick." ~ Notre Dame

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    Moderator Donkey's Avatar
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    For $20 you can buy a VAG-COM cable off ebay and use Romraider to datalog or use as a scanner if you have a laptop.
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  11. #10
    Registered User Johnny V's Avatar
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    im going to try and log the car tonite with my tactrix cable. Ill report back.
    -2004 San Remo Red WRX Sedan-
    Blobeye Syndicate #24

    "Pain of Discipline or Pain of Regret..take your pick." ~ Notre Dame

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    Moderator Donkey's Avatar
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    Quote Originally Posted by Johnny V View Post
    im going to try and log the car tonite with my tactrix cable. Ill report back.
    If you had a Tactrix cable why didn't you log it in the first place?That would have been the first thing I would have done before swapping parts out.......................
    Resident Adviser @ WTF Tuning, LLC
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    Registered User Johnny V's Avatar
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    Changed the fuel pump..still doing it.

    Update: checked the FPR, no leaks, seems fine. Haven't gotten a chance to log it yet, but a rattling has become quite apparent. From ear-analysis, it seems to be coming from the passenger side of the engine. I know it's not my exhaust. It's either a heat shield or the cat in the uppipe rattling around... Tomorrow i will begin taking the uppipe out to see what it looks like in there, and then gutting it out. Good thing I have a VF34 on the way.
    -2004 San Remo Red WRX Sedan-
    Blobeye Syndicate #24

    "Pain of Discipline or Pain of Regret..take your pick." ~ Notre Dame

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    UnBanned Sinister's Avatar
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    I'll put money on a piece of catalytic converter blowing into the turbo.

    I'll put large lump sums of money on it.
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    Registered User Kelley725's Avatar
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    Quote Originally Posted by Sinister View Post
    I'll put money on a piece of catalytic converter blowing into the turbo.

    I'll put large lump sums of money on it.
    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.

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    Moderator YBNormal07's Avatar
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    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.
    tEh PriUs=teH faSTah!@@!
    08 Audi S5 Black Diamond edition
    SOLD: 05 SWP Legacy GT Limited 5MT, 13.3ish@105 (stage 2) crappy stock clutch
    SOLD: 04 MPS/SW WRX Sti. 12.971 @ 103.97 (stock)
    278 AWHP/283 AWT, Catback exhaust
    306 AWHP/341 AWT, Stage 2
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