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Old 03-11-2009, 10:16 AM   #1
WickedXj
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Default 3rd gear stutter/hesitation under load

Hi guys

I have a stock 07 wrx I picked up about 5 months ago, bought a cobb accessport last week and flashed stage 1 93 octane, I always use chevron 94. It really woke up the car.

On my daily commute I have a pretty steep long hill (boundary from marine), and before stage 1 I kind of felt if I leaned on the gas up the hill in 3rd it was not very smooth acceleration. I never really got on the gas, I drive pretty mildly.

Yesterday going up the same hill, I figured I would really lean on the gas, wot up the hill in third. It started pulling pretty hard, then kind of slowed very briefly then pulled again, kind of did it a couple of times in short succesion, kind of like a stutter or hesitation. I got off the gas right away. It was not cool. (Yeah I know its a 60 zone but most traffic does 80-90, so I fit right in)

So my vehicle is bone stock except for the accessport, I know my air filter is a little dirty and needs replacing, don't think that could be reason. It's also a higher mileage 07 with 50k kms.

Where should I start? Can the accessport help diagnose the problem?

Any help is appreciated. Thanks. I did post in the nasioc main forum, and didnt get too much help except the suggestion it may be my boost solenoid. Also I haven't try using the accessport for live data or data logging.

Thanks in advance
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Old 03-11-2009, 11:09 AM   #2
tryallzee
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I have hesitation issues as well all my guru friends suggested changing uppipe and the downpipe . Air filter is a good idea and maybe change sparkplugs .
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Old 03-11-2009, 02:41 PM   #3
bender
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I'd start with the basics first
when was the last time the plugs and/or the fuel filter was changed?
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Old 03-11-2009, 02:53 PM   #4
WickedXj
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Quote:
Originally Posted by bender View Post
I'd start with the basics first
when was the last time the plugs and/or the fuel filter was changed?
Yeah I'm going to start there this weekend, I suspect that plugs and fuel filter are both original, likely the air filter too. Looks like they were all due at 48k.

Thanks
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Old 03-11-2009, 03:06 PM   #5
minifreak
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You should gather some logs of what's going on.

Have you tried going WOT on that hill and see if the same thing happens?
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Old 03-11-2009, 03:20 PM   #6
WickedXj
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Quote:
Originally Posted by minifreak View Post
You should gather some logs of what's going on.

Have you tried going WOT on that hill and see if the same thing happens?
I will lean on it a little in third today and see if I feel it, but like Bender said above so often it is the simple things so I will do the tuneup first. Then datalogging is the next option, which I am still learning about.

Thanks
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Old 03-11-2009, 03:46 PM   #7
dcgear
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first and cheapest thing you should try is to clean the MAF sensor, get some electrical cleaner and take out the MAF and spray it down, let it dry and plug it back in.

i had a hesitation problem much like the one you described and after cleaning it the car ran like a champ.
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Old 03-11-2009, 04:24 PM   #8
kuldud
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went up to seymour fri night and had the same issues when exceeding 5000 rpm. cleaned the maf sensor and tightened the clamps on the fmic hose and pipe connections and now back to the norm.
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Old 03-11-2009, 04:39 PM   #9
Ken
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How full was your gas tank though?
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Old 03-11-2009, 04:56 PM   #10
skittle
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Happens to me too, I am running Cobb AP stg 2. I'm due for plug replacement though.
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Old 03-11-2009, 05:05 PM   #11
WickedXj
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Quote:
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How full was your gas tank though?
3/4 tank
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Old 03-11-2009, 06:55 PM   #12
shawmacs
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Every so slight, very quick variation in pull when really leaning on it? Mine has done this since the day it was brand new. I figured it was just the wastegate opening and closing to vent pressure as you reach max boost.
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Old 03-11-2009, 07:17 PM   #13
polish man
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when i bought my 04 it did that it was bone stock with 48000 miles on it, the plugs were beat. 3 years later i just had the same problem but it was my fpr that i just put on 2 months ago. but if your pretty much stock i would say tune up.
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Old 03-11-2009, 07:41 PM   #14
alcoolaid
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It was probably knocking and the ecu pulled timing. Just do a data log.
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Old 03-11-2009, 08:08 PM   #15
clsmooth
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My car has a bit of hesitation at about 2400 rpm running on a Link ECU. Still can't quite tune it out. So sounds like tuning to me...
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Old 03-11-2009, 09:18 PM   #16
WickedXj
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Thanks for all the responses.

Just picked up a new air filter on the way home, old one was pretty dirty. Will clean MAF this weekend, likely do plugs and fuel filter too.

Then if not change will do a datalog.
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Old 03-12-2009, 12:08 AM   #17
jlam86
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Keep us posted. I have the same problem right now too. Changed my spark plugs and fuel filter last april right before RR tuned my car. It ran very well and just in the past few weeks, i have the same problem as you. I'll try cleaning the MAF sensor soon.
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Old 03-12-2009, 02:25 AM   #18
rockcrete
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I'm thinking it's probably plugs (or coilpack), but it may very well be the gas too.

I won't touch Chevron at all anymore, both my GT-R and JDM WRX hate it! Throttle response is terrible and the fuel economy plummets (loses close to 100km / tank) whenever I have used it. Petro Can 94 makes a massive difference (Shell 94 seems good too, but barely any of the stations have it so I never bother looking for it).
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Old 03-12-2009, 02:34 AM   #19
alvinli217
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Quote:
Originally Posted by WickedXj View Post
Thanks for all the responses.

Just picked up a new air filter on the way home, old one was pretty dirty. Will clean MAF this weekend, likely do plugs and fuel filter too.

Then if not change will do a datalog.
make sure u take the plastic ring out before u use electronic cleaner to clean it.

Quote:
Originally Posted by rockcrete View Post
I'm thinking it's probably plugs (or coilpack), but it may very well be the gas too.

I won't touch Chevron at all anymore, both my GT-R and JDM WRX hate it! Throttle response is terrible and the fuel economy plummets (loses close to 100km / tank) whenever I have used it. Petro Can 94 makes a massive difference (Shell 94 seems good too, but barely any of the stations have it so I never bother looking for it).
what's wrong with Chevron i have no problem with it at all.
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Old 03-12-2009, 12:12 PM   #20
rockcrete
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Quote:
Originally Posted by alvinli217 View Post
what's wrong with Chevron i have no problem with it at all.
My cars detonate on it and so the computer yanks the timing back which gives you poor throttle response and bad fuel economy. I've experienced it with multiple cars too.
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Old 03-12-2009, 01:18 PM   #21
2wheelsx2
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Quote:
Originally Posted by rockcrete View Post
My cars detonate on it and so the computer yanks the timing back which gives you poor throttle response and bad fuel economy. I've experienced it with multiple cars too.
And multiple stations too? Sometimes a station will have a leaky tank, or other problems, which lead to bad gas, but it shouldn't be at every station.
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Old 03-12-2009, 01:26 PM   #22
rockcrete
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Yes, multiple stations too - you probably won't notice it with a completely stock car, but all my cars are modded to some extent and have raised boost and are quite sensitive to it. All I can say is try a tank - the first time I did, my wife put 100km on it after I filled up and the next morning when driving to work, I was so startled by the performance I had to pull over and check that my wastegate wasn't disconnected (it was boost spiking and spooling incredibly fast).

And yes, I have had bad tanks of gas as well even from Petro Can by the freeway in Abbotsford once, I'm convinced they gave me 87 Octane which I didn't notice until I went up the snowshed hill and just about blew the motor in my GT-R........ In fact, it didn't last that long after that.........
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Old 03-12-2009, 01:35 PM   #23
shawmacs
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Wow, that is the opposie experience I have had with my pick-up (ECU modified). Runs great on Chevron... loss of mileage on PetroCan (the worst), not bad on Shell. On another note, I also found it wouldn't even run on any fuel from the Lower Mainland (they use, or at least used to use, a different mixture down here than the interior for pollution standards). ECU didn't like it, not one bit
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Old 03-12-2009, 02:18 PM   #24
rockcrete
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I have a feeling different fuels work differently in different engines / cars.

All my turbo cars like Petro Can, but I've always used Chevron in my LT1 and LS1 cars and never had a problem......

And yes, fuel formulations are different in different areas - at higher altitudes, cars are also more octane tolerant as well.
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Old 03-12-2009, 04:04 PM   #25
alcoolaid
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I run Chevron 94. I think a lot of the guys run Chevron 94 here. I put it in everything.
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