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09-28-2011, 05:28 PM | #1 |
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Vehicle:2007 WRX Wagon STish WRB |
Horrible stumble when cold/moderate when warm
I've searched other similar threads, but all of those have other symptoms and usually display a CEL, which mine does not.
Issue: Runs like CRAP when cold, gets better once it warms up a little. Still has a slight hesitation under light and moderate load; seems to run fine at WOT. Car: Stock '07 WRX w/ K&N PANEL filter (not intake) and STi OEM axle-back. Currently running AP Stage 1 since the car's stock. I've replaced the plugs, cleaned the MAF, and cleaned/re-oiled the K&N. I also checked the MAF voltage with the AP, and it rises and falls with throttle/rpm as it should (or so it appears). Is this a tuning issue? I was thinking the AP map was making it run richer when cold, thus the bad stumble. But I re-loaded the stock map, unmarried it, and it still does it, but not as bad. I'm just thinking, as with any "issue", if you add power the problem is exacerbated. Ideas? Thoughts? Thanks.
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09-29-2011, 10:27 AM | #2 |
NASIOC Vendor
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Does it idle poorly as well when cold or is the issue only present when you are driving?
Bill |
09-29-2011, 11:13 AM | #3 |
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Yea, this doesn't sound like a tune issue, sounds like a mechanical issue. Especially considering you took it back to stock and your having the same issues.
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09-30-2011, 09:46 AM | #4 | ||
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Quote:
Quote:
Thanks for the reply guys. |
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09-30-2011, 10:57 AM | #5 |
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Yeah, if it is doing it with the stock map, then you have some kind of mechanical issue. The best thing to do at this point is to get a data log when the hesitation occurs and when you have the rough idle. Try not to make it a huge log that is difficult to go through. Instead, just start the logging right before the hestitaiton (or bad idle) is occuring and end it right after.
Here's a general video on how to get started with data logging. Use the default logging set, but for your particular issue, also add "A/F Correction 1". Bill |
10-17-2011, 11:12 AM | #6 |
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Bill,
Got some short logs in per your direction. I'm assuming at this point I need to email the .xls logs to a tuner for analysis? I'll be honest, I only have a slight idea of what I'm looking at (and conversely, what it's SUPPOSED to look like). |
10-18-2011, 09:32 AM | #7 | |
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Quote:
Bill |
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11-22-2011, 06:09 PM | #8 |
Scooby Newbie
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Didn't realize .csv was a type of .xls file.
Last edited by derilict; 11-22-2011 at 06:11 PM. Reason: just kidding |
11-22-2011, 06:26 PM | #9 |
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Log 2
https://docs.google.com/open?id=0B8z...RkZjJkZTI4NDEy Log 1 https://docs.google.com/open?id=0B8z...I3MjQwMTNkOTI5 I'm not sure if these are telling much, I'll try to run a couple more when it's really misbehaving. Thanks. |
11-22-2011, 06:56 PM | #10 |
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I would think this has to do with the avcs since they are oil drivven and cold oil would flow differently than it being hot.
I think they have oil screen filters that may need cleaning. But I am far from a subaru expert yet lol |
11-23-2011, 09:27 AM | #11 | |
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Quote:
Bill |
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11-23-2011, 04:08 PM | #12 |
Scooby Newbie
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I noticed that too Bill. Having never used google docs, I wasn't sure if this was normal. So I just clicked "download" and "open" to view them. Let me know if I need to fark with something in google docs.
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11-23-2011, 05:50 PM | #13 |
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clean your maf
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11-23-2011, 06:22 PM | #14 | |
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Quote:
Bill |
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11-29-2011, 08:07 PM | #15 |
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Hey Bill, thanks for the help.
I've created a new post over at the Cobb Forums. http://www.cobbforums.com/forums/sho...460#post659460 |
11-29-2011, 08:18 PM | #16 |
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11-30-2011, 10:14 AM | #17 | |
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Quote:
Bill |
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