Hesitation rolling on throttle around 2,000rpm - Subaru WRX Forum
 
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post #1 of 15 Old 05-22-2011, 10:58 PM Thread Starter
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Hesitation rolling on throttle around 2,000rpm

Hi everybody. Just got my first wrx Friday. I bought an 09 wrx sedan with 23,000 miles on it. A big change from the 05 chevy 2500hd I traded in for it. I must say I love the car, everything about it, I couldn't be happier with it. Im not sure if theres any mods to it, but i dont think there is, from a dealer with remaining factory warranty, certified, with an additional 2 year bumper to bumper. I'm new to turbo cars and there's a hesitation I'm unsure about it so I wanted to ask. I researched for a couple hours and couldn't find anything like I'm feeling. I don't know if it's normal or something funny. When I'm rolling along around 2,000rpm and rolling on the throttle just cruisin through the gear, not looking for power, as it's slowing gaining speed it has this short power boost, like a 1/2 second to a second, then it goes away for about 1/2 second to a second, then comes back, and so on till it's a little over 3,000. It does it I've felt in maybe every gear but it's most noticeable in 3rd. I'd like to think it's the cars way of saying "come on let's move!" and me sayin "no I don't like speeding tickets". I cleaned the MAF just to see and it didn't change anything. Thank you everyone for the help!
-chris
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post #2 of 15 Old 05-22-2011, 11:19 PM
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Kinda sounds like maybe a small boost leak or maybe even its time to change out the spark plugs. mine kinda does the same thing right now and i know its time for new plugs my wife even noticed the other day. She said what's that jerky feeling? Does your car have a factory boost gauge or any way to read boost? If so tell us what its doing.

Ps welcome to the forums. Sorry we have to meet u with an issue so soon

Kevin.
Cobb ap stage 2 ots, catless uppipe, catless turboback, Cobb Sf intake.

Last edited by bad grocerygetter; 05-22-2011 at 11:21 PM. Reason: ps.
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post #3 of 15 Old 05-22-2011, 11:45 PM Thread Starter
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Thank you for the reply. I cant imagine it needed plugs with such low miles. Boost leak does sound possible. How can I check for this? And it does have a boost gauge installed but I always forget to look at it cause I'm busy looking at the revs to see of that's fluctuating or what rpms it's doing it around. Always think of the boost guage after, I'm not used to having one! Lol. The revs go up smoothly, seems like boost coming in and out...
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post #4 of 15 Old 05-23-2011, 06:56 AM
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Bring it to them to find out/fix. Warranty is there for a reason.

Welcome to the forum

Paul
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
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post #5 of 15 Old 05-23-2011, 12:20 PM Thread Starter
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I noticed it's when boost and vacuum are at 0. That's why I didn't know if it was normal. If i hold the gas pedal in the same spot it like tries to boost then changes it's mind, tries to, then says nah, it's very noticeable, and kinda annoying. I just was checking if it were normal or if there was a simple fix before I take the hour ride to the dealer. It is my first turbo car so Im sure I'll have more questions, lol. Thank you!
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post #6 of 15 Old 05-25-2011, 04:41 PM
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I had something similar happen once for a single tank of gas. Must have been bad, or perhaps I put in regular and didn't notice. It went away with the next tank. Have you run a few tanks through it? Are you using 93?

Stock cars do have an on/off sort of feel to them, but it shouldn't be that noticeable. Sounds like you need a trip to the dealer, but I bet $100 they'll just tell you it's fine and send you on your way.

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post #7 of 15 Old 05-26-2011, 06:51 PM Thread Starter
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Since getting it it's had 2 tanks of 93 run through it. Not getting any better, perhaps worse. And you would be $100 richer if i took that bet, went yesterday, they told me it was turbo lag. But it's nothing lagging, it's cruising, then losing power, then coming back then losing, so on, and it happens from 1.5k and up, depending on the gear I'm in. And if I'm on it sometimes it has a couple violent shutters. Guess I'll have to take another trip back...
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post #8 of 15 Old 05-27-2011, 06:42 AM
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Could be a dirty MAF or a clogged injector, dirty filter, junk fuel pump.

Did the BCS get better from the prior years?

Paul
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post #9 of 15 Old 05-27-2011, 10:03 AM
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So, pretty much all WRX's have some sort of hesitation when accelerating with the stock ECU map. My car had it at around 4k RPM. It was worse in first and second gear, and generally smooth in third. The hesitation during acceleration went away when I installed my Cobb Accessport. It really smoothed out my acceleration throughout the whole RPM band.

I also experienced the chugging sensation before I changed out my motor and transmission mounts. Especially if I just punched it at 2k, it would chug a couple of times and then take off. It's the soft rubbery trans and engine mounts.

I honestly think you may be experiencing what every WRX does, but you may be very sensitive to it since you just bought the car. Take the technician for a ride and if it's really as bad as you say it is I'm sure he'll agree something is off. Also, while you're there, take out another WRX (not STI) and see if it does the same thing.

If you're convinced something is wrong with your car you need to find a good Subaru shop (not a dealer) to inspect your car to see if the previous owner modified it and then put it back to stock before selling it. Maybe in doing that they created a vacuum or boost leak. Another possibility is a loose heat shield rattling around loudly under the hood and creating false knock. This would cause the computer to pull timing and cause a hesitation. The heat shield over the down pipe has something like 17 bolts so most people leave them off when they switch out the downpipe, or remove them completely. This is the first place to look to see if your car has been modified by the previous owner.

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post #10 of 15 Old 05-27-2011, 11:09 AM
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^^That's fixed with a 3port BCS though.

Paul
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post #11 of 15 Old 05-27-2011, 12:12 PM
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Quote:
Originally Posted by pzr2874 View Post
^^That's fixed with a 3port BCS though.
I'm sure that would help, but he would still need a tune for that right? I'm assuming this is a totally stock car so I don't think throwing on new BCS is the right answer. It would really raise some eyebrows at the dealership.

At least with a Cobb he could take it off if he needed warranty work done.

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post #12 of 15 Old 05-27-2011, 01:26 PM
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True... Didn't think about the add'l warranty he purchased....

Get yur $ back on the warranty if they can't "fix it"... and go buy a few parts for it... AP, 3port and a tune.

Paul
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post #13 of 15 Old 05-27-2011, 03:22 PM
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Good advice. I returned my extended warranty about 6 months after I bought it. I still had little things fixed under the 3 year warranty. Nothing engine or trans related. Dealer never noticed or cared about any mods.

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post #14 of 15 Old 05-27-2011, 06:23 PM Thread Starter
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I dont know, it's the only wrx I drove that does it. I changed the air filter and cleaned the MAF, no change. It doesn't always do it. It seems like it does it more cold, than hot, and when it does it when I'm on it hard it's pretty vicious, like I quickly punch the clutch in and out, sometimes a couple times, but it doesn't rev out, just a similar feel...
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post #15 of 15 Old 05-31-2011, 07:07 AM
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Take the advice we spoke of. Save the headaches.

Paul
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