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Old 07-28-2011, 06:11 PM   #1
jmustico4
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Member#: 286625
Join Date: Jun 2011
Chapter/Region: South East
Location: tierra verde, fl
Vehicle:
2005 wrx wagon
wrb

Default Data Log help

I'm having a weird misfire/hesitation going on with my car for about 3 weeks now. It started about 2 days after I did a timing belt change on my wrx. I've been told it could be as simple as a vacuum leak. But I dont really have any idea what to look for. Could someone tell me what parameters to select while I conduct some "data logs?" I have never used this feature of the AP, so I need all the advice I can get. How long should the logs be? Just floor it? I really have no clue? I appreciate any help you can provide.
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Old 07-28-2011, 06:28 PM   #2
Cobb Tuning
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Under what conditions are you feeling the hesitiation (throttle, RPM, etc.)? Is your check engine light on and if so, what codes are found?

The AccessPORT v2 has a default set of logging parameters selected that I would go ahead and start with. If you can do so safely, do a 3rd gear wide open throttle run from around 2000-2500 RPM to near redline (or as high as you can do safely).

I would also check your long-term fuel trims. Make sure that you have the latest firmware version for the AccessPORT (using the AccessPORT Manager software). If you've done a good bit of driving since you last reflashed a map, reset the ECU or disconnected the battery, check A/F Learning #1 A, B, C, D via the live monitor funciton on the AccessPORT and report back those values.

Bill
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Old 07-28-2011, 08:03 PM   #3
jmustico4
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Default

I updated the AP with the all the updates earlier today. The car has never had a check engine light illuminate, and every time I check for codes, there are none present. The car drives/accelerates as strong as ever, just a weird split second loss of power under partial acceleration and cruising. I'd say it occurs between 2500 and 3500 rpm with no significant pattern. Sometimes it will happen every 20/30 seconds, other times it will not do it for a few minutes. I disconnected the battery for 30 mins today while I was updating the AP and went driving after reflashing the ECU. It still feels like its doing it, but cant say for sure until I get on the highway tomorrow A.M. I will go do a couple 3rd gear pulls and get you the values for the A/F Learning #1 A, B, C, D. I will report back shortly.
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Old 07-28-2011, 08:13 PM   #4
Cobb Tuning
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I would also get a log when the hesitation happens.

Bill
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Old 07-28-2011, 09:06 PM   #5
jmustico4
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Did some quick pulls, man she feels unhealthy, hope you can tell me whatswrong. Also jotted those AF learning #'s down: 1A= 1.8%, 1B=0.0, 1C=0.4, 1D=0.0, and 1=0.0. Heres the pulls
https://spreadsheets.google.com/spre...FDb3c&hl=en_US
https://spreadsheets.google.com/spreadsheet/ccc?key=0Ap1lbjpH-yMNdGRzMjl2Yy14bWhZRHFJaFBWeU5Cdmc&hl=en_UShttps://spreadsheets.google.com/spreadsheet/ccc?key=0Ap1lbjpH-yMNdFJHbkdpY1FNVG9UM1F6SEI4UzR2emc&hl=en_US

I will take another log while on the highway tomorrow
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Old 07-29-2011, 08:44 AM   #6
Cobb Tuning
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Your log is a WOT run, but only up to 4300 RPM. If you can't get a WOT run to near redline in 3rd gear (because it is unsafe), try a 2nd gear run instead.

Highway driving isn't going to tell us much unless your hesitation occurs then. Besides the WOT log described above, you want to log only around when the hestitation occurs (instead of huge log where we would have to guess where the hesitation was). I would add "A/F Correction 1" to the logging set as well for the hesitation log.

Bill
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Old 07-29-2011, 05:51 PM   #7
jmustico4
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Old 08-01-2011, 06:23 PM   #8
jmustico4
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Whaddya think?
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