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Old 07-10-2013, 11:03 PM   #1
Dannysti
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Default 06 sti fuel cuts

I have an 06 Sti and The car has been running ****ty.. I have new 850cc deatschwerk injectors walbro 255 fuel pump.. Headers up pipe down pipe 3" exhaust manual boost control and the car has been tuned at 18 psi. The car has been tuned 3 times. The first time it was tuned I switched injectors and fuel pump and installed PE 850cc injectors and walbro 255 fuel pump, the car ran good for a bit then It started getting fuel cuts. During the fuel cuts my car wouldn't turn on after i turned off the car for 5-15 min, i would let the car cool down and then it would start. I took the car back to retuned the tuner said the fuel pump was out so he switched it and started Tunning and the car wouldn't idol right so he said my injectors where going out. when I had bought the PE injectors they where new. He ordered new deatschwerk injectors, installed them and the idol went to normal and when I would turn off the car the car would start all the time, I wouldn't have to wait until it cools down. During the tune my fuel pump controller would shut down because it wouldn't get enough voltage and shut down my fuel pump too. They tried 3 different fuel pumps and 2 different fuel pump controllers and it would keep doing it again, the car would shut down. The tuner said he has never seen anything like it. He left it alone cuz they couldn't figure It out but they said it had to be something electrical. I drove the car home and it ran good I did a couple of pulls and pulled good. I let the car sit for a day and the following day I took it to work. On my way to work it ran fine and on lunch but once I got off from work as I was driving home I started noticing the fuel cuts again so at this point I don't know what else to do so please if anyone has heard or has had this problem to their car let me know how to fix it. Thanks.
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Old 07-11-2013, 08:33 AM   #2
dstroy
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Change fuel pump relay, fuse, rewire FPC? You can run your pump at 100% until you get it fixed, but that will overwhelm the stock return and raise idle BFP to about 70ish psi.
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Old 07-11-2013, 11:13 AM   #3
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Sounds like cam sensor failing.
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Old 07-11-2013, 07:46 PM   #4
Dannysti
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Quote:
Originally Posted by dstroy View Post
Change fuel pump relay, fuse, rewire FPC? You can run your pump at 100% until you get it fixed, but that will overwhelm the stock return and raise idle BFP to about 70ish psi.
Is the fuel pump relay the same as the fuel pump controller? If not where is the fuel pump relay located?
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Old 07-11-2013, 08:10 PM   #5
Dannysti
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Quote:
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Sounds like cam sensor failing.
If its fuel cuts I'm getting shouldn't it be something to do with the fuel pump or that controls fuel?
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Old 07-11-2013, 10:13 PM   #6
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Lol, the cam and crank sensors ARE a big part of the fuel control. If either is flaky or craps out you get zero fuel. If the fuel pump is on its way out or cant flow enough you just go a little lean, unless the fuel pump problem is an intermittent short/break in the wiring.
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Old 07-16-2013, 01:32 AM   #7
Dannysti
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Quote:
Originally Posted by Leafy View Post
Lol, the cam and crank sensors ARE a big part of the fuel control. If either is flaky or craps out you get zero fuel. If the fuel pump is on its way out or cant flow enough you just go a little lean, unless the fuel pump problem is an intermittent short/break in the wiring.
My car is getting worse. The fuel cuts happen at 2.5 rpm and loose power so I have to shift and it continues to do it threw out all the gears.. Any more ideas?
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Old 07-16-2013, 06:50 AM   #8
dstroy
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Did you try any further troubleshooting on your own?
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Old 07-26-2013, 07:25 PM   #9
Dannysti
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Now I have a cel p0171 system too lean.. Any suggestions. Thanks in advance.
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Old 08-02-2013, 06:49 PM   #10
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Bump!
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Old 08-02-2013, 08:59 PM   #11
some dude
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Can you datalog?
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Old 08-02-2013, 10:16 PM   #12
dstroy
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Try cleaning your maf, see if it quits. If that doesn't do it then unplug your maf, drive a short distance and see if it does it. Make sure you do not have a vacuum/boost leak. Swap your front and rear o2 sensors, see if you get a different code. Post any results here.
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Old 08-05-2013, 11:58 PM   #13
Dannysti
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Quote:
Originally Posted by dstroy View Post
Try cleaning your maf, see if it quits. If that doesn't do it then unplug your maf, drive a short distance and see if it does it. Make sure you do not have a vacuum/boost leak. Swap your front and rear o2 sensors, see if you get a different code. Post any results here.
Thanks ill try that
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Old 08-07-2013, 01:28 AM   #14
Dannysti
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Quote:
Originally Posted by dstroy View Post
Try cleaning your maf, see if it quits. If that doesn't do it then unplug your maf, drive a short distance and see if it does it. Make sure you do not have a vacuum/boost leak. Swap your front and rear o2 sensors, see if you get a different code. Post any results here.
I cleaned the MAF sensor but still running the same and sometimes it'll throw random misfire codes on any cylinder. I disconnected the MAF sensor and drove it for 2 min and it ran the same. My friend connected his scanner and saw that the o2 sensors where working fine so as of now the car still has the fuel cuts and p0171 system too clean.. Any other suggestion?
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Old 08-07-2013, 07:39 AM   #15
dstroy
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http://www.ehow.com/how_5193043_test-sensor.html

Do not do steps 9 or 10.

There is also a ground for the ECU right underneath the coolant overflow tank on your intake manifold, it's a 12mm bolt. Take that out and peel back some of the factory coating to look for corrosion, and clean it. Do the same thing for your battery terminal leads, make sure that you replace any protective covering.
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