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Old 10-01-2007, 01:11 AM   #1
VideoGameWrx
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Member#: 68197
Join Date: Aug 2004
Chapter/Region: South East
Location: south florida
Vehicle:
2005 OBP WRX
PPG + EJ257

Default Bad fuel pump? please help!

I don't want to jump to conclusions based on a log, but I can clearly tell is that it is unsafe for me to go WOT until this is figured out. I felt that the car was running lean and stumble on acceleration occassionally on WOT, but at other times it would pull hard....This is log from crappy acceleration and very dangerous AFRs

the 4th value is AFR

3rd gear

01:48:05.097,1.53,4.08,13.90,3437,17.50,16.01,88.2 4,100.00,47
01:48:05.275,1.70,5.69,14.24,3480,14.50,16.86,98.2 2,100.00,48
01:48:05.449,1.86,7.37,14.24,3488,14.00,17.82,108. 11,100.00,48
01:48:05.627,2.04,9.30,14.47,3580,14.00,19.70,123. 28,100.00,48
01:48:05.801,2.24,11.10,14.47,3698,14.00,22.15,134 .78,100.00,50
01:48:05.979,2.42,13.21,15.16,3740,14.00,30.77,148 .56,100.00,50
01:48:06.153,2.61,14.54,11.94,3801,13.00,35.11,169 .00,100.00,50
01:48:06.329,2.71,15.78,12.29,3941,13.00,35.68,172 .10,100.00,52
01:48:06.505,2.82,17.69,12.86,4017,13.00,36.99,179 .75,100.00,52
01:48:06.681,3.05,18.83,12.75,4065,13.00,42.85,209 .01,100.00,54
01:48:06.856,3.13,19.74,14.24,4157,13.00,44.23,218.98,100.00,54
01:48:07.032,3.18,20.19,14.36,4286,10.50,47.00,226.00,100.00,54
01:48:07.208,3.32,20.44,15.04,4240,10.50,48.45,239.96,100.00,57
01:48:07.384,3.31,20.59,16.19,4401,8.50,49.74,242.16,100.00,57
01:48:07.560,3.34,20.34,16.42,4481,8.50,49.76,251.42,100.00,57
01:48:07.736,3.33,20.11,17.34,4618,8.00,66.91,252.31,100.00,60
01:48:07.912,3.26,19.97,13.09,4688,9.50,65.02,248.33,100.00,60
01:48:08.088,3.21,19.86,12.06,4838,9.50,66.92,253. 24,100.00,64

01:48:08.264,3.16,19.61,11.60,4883,9.50,67.09,255. 05,100.00,64
01:48:08.444,3.16,19.39,11.25,5084,10.50,67.54,261 .52,100.00,64
01:48:08.616,3.18,19.01,11.25,5140,11.00,69.42,267 .08,100.00,68
01:48:08.792,3.13,18.93,11.37,5296,12.50,70.18,269 .45,100.00,68
01:48:08.970,3.12,18.56,11.25,5330,12.50,71.18,274 .74,100.00,68
01:48:09.145,3.07,18.33,11.25,5494,13.00,70.50,273 .30,100.00,71
01:48:09.321,3.04,18.23,11.25,5531,13.00,71.50,275 .22,100.00,71
01:48:09.496,3.01,18.29,11.25,5673,13.50,70.79,279 .13,100.00,75
01:48:09.673,3.04,18.27,11.25,5686,14.50,73.82,288 .41,100.00,75
01:48:09.848,3.01,18.37,11.25,5832,15.50,73.99,294 .54,100.00,75
01:48:10.041,2.98,18.37,11.25,5919,15.50,74.65,289 .94,100.00,79
01:48:10.216,2.97,18.20,11.37,5995,15.50,74.50,293 .01,100.00,79
01:48:10.393,2.93,18.08,11.25,6033,16.00,75.46,293 .77,100.00,79
01:48:10.568,2.89,18.06,11.25,6152,16.50,75.44,293 .77,100.00,83
01:48:10.746,2.86,17.83,11.25,6271,17.00,74.81,295 .31,100.00,83
01:48:10.920,2.78,17.91,11.25,6318,19.00,73.58,290 .71,100.00,86
01:48:11.096,2.75,18.16,11.37,6432,19.50,74.13,293 .01,100.00,86
01:48:11.272,2.75,18.10,11.25,6460,20.00,74.10,295 .31,100.00,86
01:48:11.448,2.71,18.25,11.37,6608,20.00,74.42,295 .31,100.00,89
01:48:11.624,2.68,18.22,11.37,6660,20.50,74.71,295 .31,100.00,89
01:48:11.800,2.63,3.56,11.25,6714,20.50,75.31,294. 54,100.00,89
01:48:11.976,0.87,8.16,11.25,7163,20.50,74.48,295. 31,0.00,92



However, earlier in the day here is a perfectly normal pull

4th gear

23:03:00.696,2.82,16.86,11.71,3671,13.00,50.37,176 .61,100.00,68
23:03:00.872,2.95,17.89,11.25,3689,13.00,54.25,186.57,100.00,68
23:03:01.048,3.03,18.85,11.25,3796,13.00,55.73,192.84,100.00,70
23:03:01.224,3.09,19.57,11.25,3822,13.00,57.52,196.89,100.00,70
23:03:01.400,3.12,20.07,11.25,3852,13.00,59.79,205.39,100.00,73
23:03:01.575,3.15,20.32,11.25,3947,13.00,61.21,208.95,100.00,73
23:03:01.752,3.16,20.30,11.25,3987,13.00,62.96,213.68,100.00,73
23:03:01.927,3.17,20.48,11.25,4043,13.00,64.76,215.66,100.00,75
23:03:02.103,3.20,20.59,11.25,4102,13.00,65.27,220.10,100.00,75
23:03:02.279,3.24,20.67,11.25,4136,13.00,67.00,225.16,100.00,75
23:03:02.455,3.24,20.75,11.25,4188,13.00,68.14,229.79,100.00,78
23:03:02.632,3.28,20.73,11.25,4259,13.00,68.88,234.43,100.00,78
23:03:02.807,3.27,20.63,11.25,4345,13.00,70.16,238.67,100.00,80
23:03:02.984,3.22,20.15,11.25,4328,13.00,70.21,234.00,100.00,80
23:03:03.159,3.16,19.49,11.25,4396,13.00,67.96,234.00,100.00,80
23:03:03.334,3.12,19.20,11.25,4475,13.00,68.51,233.58,100.00,83
23:03:03.516,3.10,19.01,11.25,4523,13.00,68.43,231.89,100.00,83
23:03:03.702,3.07,18.66,11.25,4559,13.00,68.06,236 .53,100.00,83
23:03:03.879,3.08,18.87,11.25,4624,13.00,69.73,238 .23,100.00,86
23:03:04.054,3.10,19.09,11.25,4670,13.50,69.60,241 .72,100.00,86
23:03:04.231,3.13,19.38,11.25,4738,13.50,72.68,247 .01,100.00,89
23:03:04.406,3.13,19.61,11.25,4798,13.50,72.91,248 .33,100.00,89
23:03:04.582,3.15,19.45,11.25,4820,14.00,73.43,256 .90,99.22,89
23:03:04.758,3.04,18.83,11.25,4848,15.00,72.20,247 .45,98.43,92
23:03:04.934,3.07,18.87,11.25,4873,15.00,74.32,255 .05,98.82,92
23:03:05.111,2.90,11.18,11.25,4977,15.50,71.86,253 .21,18.82,92
23:03:05.286,0.96,-7.35,11.25,4905,9.50,0.00,92.31,0.00,94
23:03:05.463,1.85,-9.11,12.75,4860,9.50,0.00,163.97,0.00,94
23:03:05.638,1.55,-9.73,13.67,4918,9.50,0.00,119.53,0.00,96
23:03:05.814,1.13,-10.06,25.27,4908,9.50,0.00,89.54,0.00,96
23:03:05.990,0.89,-10.38,25.27,4905,9.50,0.00,69.00,0.00,96

Any input would be appreciated....

my thoughts: change fuel filter, check fuel pump?
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Last edited by VideoGameWrx; 10-01-2007 at 01:32 AM.
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Old 10-01-2007, 01:19 AM   #2
VladiWrX
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holy batman!!!!!!!! WAY TOO MUCH NUMBERS
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Old 10-01-2007, 01:30 AM   #3
VideoGameWrx
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PPG + EJ257

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lol sorry, 4th value is AFR, and 5th value is RPM, in the first pull I am running lean from 3-4.5k RPM, then in the second pull it is nice and rich the whole way through with the same boost levels and evrything else equal....what gives?
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Old 10-01-2007, 01:23 PM   #4
benw
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running some kind of injection?
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Old 10-01-2007, 02:33 PM   #5
VideoGameWrx
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Yes water/meth it begins to spray at 10psi and continues to spray the same amount until I go below 10psi. I checked the filter on the nozzle a couple of weeks ago and it is clean.
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Old 10-11-2007, 08:16 PM   #6
ride5000
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if you've got sufficient fuel in the tank, then you should pull the pump and inspect/clean the sock on the pickup. clean it with non chloro brake cleaner, and clean it really well. reinstall and report back.

i had similar issues a while back and the sock was pretty dirty... probably dirty gasoline. symptoms just like fuel starvation, but still plenty of fuel in the tank.

hth
ken
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Old 10-17-2007, 06:22 PM   #7
VideoGameWrx
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thanks, it definately acts as if there is no fuel in the tank even if there is a fuel tank. And it is completely random. Maye I can get to cleaning the fuel pump this weekend, The car runs like a monster when the fuel get there, I am going to heve to start being more careful on where I fill up
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Old 10-17-2007, 07:38 PM   #8
shootinsoobie
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i looked at this and thought i was back in the matrix!!
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Old 10-19-2007, 10:29 AM   #9
akira02rex
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that looks like an afr reading from the oem o2 sensor, is it?
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Old 10-20-2007, 12:32 PM   #10
VideoGameWrx
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Quote:
Originally Posted by akira02rex View Post
that looks like an afr reading from the oem o2 sensor, is it?
yes it is, i know its not very accurate but it doesnt give me an idea of rich vs lean
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