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Old 08-23-2003, 12:56 AM   #1
rodon
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Member#: 36372
Join Date: May 2003
Location: Delaware
Vehicle:
'03 WRX Sedan
Silver

Default Hesitation at 3K rpm/light boost - dealer fixed?!?!?! (weird)

I've been having an annoying hesitation in the midrange (most noticeable between around 2800 and 3500 r's at light throttle - whether cruising or accelerating) with my '03 WRX (bought new recently). It really affects driveability. I finally got annoyed enough and it was time to drop it off at the dealer early this morning (Matt Slap in Newark, Delaware).
I called them after lunch to see what was going on with it, and the service desk guy said that they had had two different techs take it for a spin, and that they did not notice any problem. He asked if I might stop by and take one of them for a drive with me. It's definitely noticeable from the passenger seat. Anyway, I got out on the road with this guy, and there was no hint of the problem. In fact, I noticed that the car was running a lot better than ever. He claimed that they had not done anything to it. They basically said to bring it back in if it got worse or whatever. Anyway, I drove it some more this evening, and man, it runs really nice. I guess this is the way it was supposed to be. I can stomp on the gas at 2k rpm and there's no hesitation all the way to redline. Anyway, what could they have done (ECU reset perhaps?), and why would they claim they had not done anything (everybody swore up and down that they had only taken it out for the test drives and nothing else)? Why would they not fess up to resetting the ECU or whatever it is they did?
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Old 08-26-2003, 10:14 PM   #2
rodon
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Member#: 36372
Join Date: May 2003
Location: Delaware
Vehicle:
'03 WRX Sedan
Silver

Question

I still can't believe how much better (smoother and more power in low rpm) the car is running. It's like it was only firing on 3 cylinders before I took it to the dealer.

Anybody have any ideas?
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Old 08-27-2003, 05:44 PM   #3
procirwrx
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Member#: 42424
Join Date: Aug 2003
Chapter/Region: South East
Location: Winter Park, Fl
Vehicle:
2004 WRX
Platinum Silver

Default

I am having the same problem you described in your earlier post. I have a 2004 Impreza WRX, currently with 4000 miles on it. For the first 1000 miles I never really went above the 4000 rpm mark, ok maybe I did a handful of times. After reaching the 2000 mile mark I started to run the car a little harder, thats when I noticed the problem. When I go WOT in second gear I have a pretty significant hiccup or drop in power around the 3800-4500rpm range. After 4500 rpm the car pulls hard. Its significant enough to where the passenger can even feel the drop in power from their seat. I took it in to Subaru for my first oil change and explained the problem to them. They stated they could not find anything wrong, car had no codes when hooked up to diagnostics, mechanic even took it for a spin. My ECU has been reset. I did this when I installed the Subaru security system upgrade. No real change after reseting my ECU. If you have any ideas on what I should try next please post. I think the next step I might try is going back to Subaru and have the mechanic ride with me.
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Old 08-28-2003, 01:52 AM   #4
SAINTSOFSPEED
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Member#: 40596
Join Date: Jul 2003
Chapter/Region: SCIC
Location: Huntington Beach, CA
Vehicle:
03 WRX
MBP

Post HESITATION

I have the same problem. Im concern because I dont see enough push from 2nd to 3rd. Also, I tend to hear my turbo weak at hot points of the day. If anyone has an answer, please help
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Old 08-30-2003, 11:56 AM   #5
MrFeebs
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Member#: 38580
Join Date: Jun 2003
Location: Exeter,RI
Vehicle:
2004 WRX
Silver

Default

In my 04 ive been noticing about the same thing, especially in 3rd gear. Once the car starts pulling hard, the boost seems to drop a bit, then come back up and pull again. I cant really think of anything that would cause this. Any ideas?
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Old 08-30-2003, 02:25 PM   #6
Stanley
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Member#: 7374
Join Date: Jun 2001
Location: North Bay, SFCA
Vehicle:
2007 Grandpamobile
BlingBlingBlue

Question A guess

It's been speculated that doing the "grounding mod" will solve this problem. The theory is that there is too much resistance in the stock ground, causing voltage fluctuations and subsequent ECU problems. Perhaps the dealer tightened up a loose ground?
Maybe they just reset the ECU and drove it like the bad little girl it is?

Saintsofspeed: Heat and humidity both degrade the performance of a turbo charged car. Perhaps this is what you are experiencing?
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Old 09-01-2003, 10:59 PM   #7
SAINTSOFSPEED
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Member#: 40596
Join Date: Jul 2003
Chapter/Region: SCIC
Location: Huntington Beach, CA
Vehicle:
03 WRX
MBP

Post

THANKS. I been having the worst luck. I just had a rock hit my windshield. Its about the size of a pebble. I hate my life.


SOS
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Old 09-02-2003, 07:07 AM   #8
MrFeebs
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Member#: 38580
Join Date: Jun 2003
Location: Exeter,RI
Vehicle:
2004 WRX
Silver

Default

I hear that, my windshields already got one.
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Old 09-02-2003, 10:08 AM   #9
TimStevens
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Member#: 4817
Join Date: Mar 2001
Chapter/Region: NESIC
Location: Albanyish, NY
Vehicle:
2012 STI, '02 WRX
'91 MR2, '05 Speed Triple

Default

This has been something folks have been noticing since the early '02's (like mine). I'm a little surprised it wasn't fixed in the '04's.

Anyway, resetting the ECU seems to help, which is probably what the dealership did for you, rodon. Last I heard folks believed the sort of power hiccup was somehow related to the ECU switching from what I call "granny mode" (trying to get decent fuel economy) to a higher performance mode. I performed the grounding mod and it did seem to help, but that could simply have been the reset, as I still notice the power hiccups from time to time. Anyhow, the grounding mod will take you perhaps 30 minutes and only costs a few bucks for some dielectric grease, and certainly won't do anything to your warranty, so give it a shot.

-tim
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Old 09-03-2003, 02:29 PM   #10
draggin wagon04
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Member#: 39474
Join Date: Jul 2003
Chapter/Region: MWSOC
Location: MPLS, MN
Vehicle:
form er WRXwag owner
Integra GSR 4-door

Default

Grounding Mod?
Hook Me Up!
Where in this forum can I find the info?
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