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Old 06-20-2013, 10:29 AM   #26
jtrakel
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Originally Posted by StIGC11 View Post
I would try a leak down and compression test if you already havent. I run into the problem of having cylinder rough at idle with those injectors on 92oct with anything above 13.0afr however cruising and WOT are fine (has nothing to do with this but yea).
Edited I forgot to add those to my already completed list of trouble shooting thanks for pointing that out!
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Old 06-20-2013, 10:55 AM   #27
02h20
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Harness. Same thing happened to me and I swapped the harness on the intake manifold and fixed it. Also try more grounds.
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Old 06-20-2013, 11:05 AM   #28
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Harness. Same thing happened to me and I swapped the harness on the intake manifold and fixed it. Also try more grounds.
So you just swapped the entire harness out and it fixed all problems?
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Old 06-20-2013, 04:03 PM   #29
john 1badSTI
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do a log monitoring your avcs,if that int. cam for some reason is staying advanced(even a few degress) when its not supposed to it will cause misfires.
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Old 06-21-2013, 04:58 AM   #30
02h20
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Yes. Just the harness on the intake manifold. I'mnot saying that's your problem lol but it was mine. Check what John is saying also about avcs
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Old 06-21-2013, 09:54 AM   #31
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Nice build man, I look forward to starting mine. Probably going to be awhile before its ready for the road. I am hoping to break the 600 mark as well. I don't know if anyone has done that in an OBXT yet? Good luck with the misfire.













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Old 06-21-2013, 01:25 PM   #32
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Nice build man, I look forward to starting mine. Probably going to be awhile before its ready for the road. I am hoping to break the 600 mark as well. I don't know if anyone has done that in an OBXT yet? Good luck with the misfire. Subscribed for updates
Thanks man I still owe you some feedback! I will get to it ASAP with what you will have soon 600 should be no problem with the right turbo set-up! The block will hold it that's for sure!
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Old 06-26-2013, 01:06 PM   #33
02 wrx roar
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Intake Leak Only On That Cylinder? Under Boost It May Be Passing By And Not Actully Missfiring But The Cylinder Could Be Running A Different Afr... Witch Is No Good Ovisouly... Anyway Just A Sugestion Good Luck
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Old 06-26-2013, 01:21 PM   #34
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Originally Posted by 02 wrx roar View Post
Intake Leak Only On That Cylinder? Under Boost It May Be Passing By And Not Actully Missfiring But The Cylinder Could Be Running A Different Afr... Witch Is No Good Ovisouly... Anyway Just A Sugestion Good Luck
It's not under boost at all on when I sustain a rpm usually 4th gear around 3k is the worst on #1 cylinder
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Old 06-28-2013, 01:39 PM   #35
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I would check just to see but ur right it would do Italy the time most likely... Possible coil? Or bad ecu?
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Old 06-30-2013, 12:40 AM   #36
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I would check just to see but ur right it would do Italy the time most likely... Possible coil? Or bad ecu?
Have new coil packs and swapped them around more times that I can count now. Already threw a new ECU in it as well. I'm going to possibly switch to pump gas (92oct) to see if it follows. I've been running E85 for a few years now on different set-ups threw out my building process and have never ran into this issue.

I wish I would have payed more attention to the cylinders during my break in while running pump instead of trying to figure it out now.

I've also yet to swap the engine harness. A new development for whatever reason my shops computer will not read the front 02 sensor either it does not move on their scan gauge during any conditions idle or driving The sensor is brand new I do not get any codes and I've tried multiple 02 sensors that worked on different cars perfectly. We have looked through the main harness which goes into the ECU through the firewall and found no messed up wires etc. it's also not attached to the engine harness that I still want to swap to check the block. Is there a possible connection somewhere that I'm missing?
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Old 07-01-2013, 11:48 AM   #37
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Maybe the conntector thats actully hooked into the sensor? Probe it for continuity from the Ecu pin to the sensor and see if u got a solid wire or if theres a break... Have u done a leak down? Or compression test to see if u have a valve issue? Maybe spark plug arching? Like a broke porsolin sorry not the best speller lol.. Umm if its one cylinder maybe ur harness could have a break and causeing it to ground out or something

I vote harness issue!!!!
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Old 07-04-2013, 12:04 AM   #38
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Quick update I swapped the harness today and the roughness stayed the same :-(
We tried to knock out a tune today as well and ran into some fuel issues for whatever reason. I'm going to take out the fuel pump tomorrow and see if something is going on with my pump pressure is dropping off once we start putting 22lbs+ of boost. I've ran 26 on this turbo and exact fuel set-up as I currently have without issues. So on to more trouble shooting I have Walbro E85 drop in pump, stock lines to the fire wall, All -6 steel braided lines with Aeromotive fuel rails and FIC 2150 top feeds, AEM FPR.

We also set-up the car into a hybrid MAF/SD system to see if it can alleviate the roughness issues but in my opinion it seemed to make the car worse. I drove it home on one of the low PSI maps and could barley keep it running so I had to grab a different map from my tuner that we used before today in order to keep to car drivable. Problems, problems, problems story of my life. I don't have any graphs of the dyno session today but it more or less felt like a waste of time and money. Maybe I'm just tired from the day in general /rant!
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Old 07-07-2013, 03:23 AM   #39
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Where did you get those yellow and blue AN fittings from?
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Old 07-07-2013, 11:10 AM   #40
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Where did you get those yellow and blue AN fittings from?
A close friend that works for a aviation company.
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Old 07-07-2013, 11:14 AM   #41
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Have you checked the injectors, moved them around to see if the problem follows?

Do you have accurate data on the injectors? Although it seems most problems with imbalanced/ mismatched injectors happens at lower pulse widths around idle or cruising speeds.
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Old 07-07-2013, 11:16 AM   #42
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Have you checked the injectors, moved them around to see if the problem follows?
Yup that's already been done
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Old 07-07-2013, 01:38 PM   #43
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My brand new pump was shot and did the same thing on the dyno replace it and send it back i had a aeromotive 340 do that littlery out of the box...
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Old 07-07-2013, 04:14 PM   #44
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My brand new pump was shot and did the same thing on the dyno replace it and send it back i had a aeromotive 340 do that littlery out of the box...
My pump is fine it's simply not supporting the demand from the motor. I just picked up a fuelab 1300hp pump and inline filter along with a surge tank so there will no longer be a issue with fuel at all.

Also the injectors are brand new and they did come with a flow chart matched to my injectors everything was pretty spot on. I cannot recall the numbers off the top of my head I've also yet to see any issues from other members with FIC I've ran there injectors for a few years now with zero issues.
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Old 07-07-2013, 05:10 PM   #45
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A close friend that works for a aviation company.
Awesome thanks for the reply.
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Old 07-07-2013, 05:33 PM   #46
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Awesome thanks for the reply.
Sorry I can't be more help
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Old 07-10-2013, 08:05 AM   #47
02 wrx roar
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How about a maf problem? If thats not it im about out of ideas ive seen some goofy **** on theses cars but right now i got nothing else to offer my friend
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Old 07-10-2013, 09:06 AM   #48
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What about a blockage in the fuel line or kink
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Old 07-10-2013, 01:26 PM   #49
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How about a maf problem? If thats not it im about out of ideas ive seen some goofy **** on theses cars but right now i got nothing else to offer my friend

We are looking into the MAF stuff right now I'm chalking this up to some type of software issue. I did some more driving around yesterday before work I do not get any type of misfire issue while under 2k no matter the gear. Once about the 2k mark in RPM it will begin to missfire on cylinder 1. It tappers off when in 5th and is almost non existent in 6th. I'm wondering if this has something to do with the Speed Density taking over the MAF or what. Currently awaiting a response from my tuner for more guidance. With that being said though I'm pretty confident it is nothing mechanical.


Quote:
Originally Posted by 02 wrx roar View Post
What about a blockage in the fuel line or kink
No blockage anywhere in my fuel system we have already looked though that the pump is doing it's job if I pinch off the return line pressure sky rockets to 100psi like it's supposed to. I'm simply not giving enough fuel to my 2150's I wondered from the get go if this pump was not enough and I'm finding it out now O well. I'm leaving for a school in a couple weeks so my motivation to complete the car right now is dwindling away since it will be winter when I get home again. O well more info to follow later!
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Old 07-10-2013, 01:35 PM   #50
manitou
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Quote:
Originally Posted by jtrakel View Post
We are looking into the MAF stuff right now I'm chalking this up to some type of software issue. I did some more driving around yesterday before work I do not get any type of misfire issue while under 2k no matter the gear. Once about the 2k mark in RPM it will begin to missfire on cylinder 1. It tappers off when in 5th and is almost non existent in 6th. I'm wondering if this has something to do with the Speed Density taking over the MAF or what. Currently awaiting a response from my tuner for more guidance. With that being said though I'm pretty confident it is nothing mechanical.




No blockage anywhere in my fuel system we have already looked though that the pump is doing it's job if I pinch off the return line pressure sky rockets to 100psi like it's supposed to. I'm simply not giving enough fuel to my 2150's I wondered from the get go if this pump was not enough and I'm finding it out now O well. I'm leaving for a school in a couple weeks so my motivation to complete the car right now is dwindling away since it will be winter when I get home again. O well more info to follow later!
Sounds like tuning but not load based. You should have him just run SD with no MAF. It may take him a bit more to get that right with the VE map and all but Jr. tune my car that way and it runs very nice from idle on up!

Did you do the re-wire of the Walbro with 10 or 12 gauge wire, bigger relay etc...?
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