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07-10-2013, 09:31 PM | #1 |
Scooby Newbie
Member#: 354456
Join Date: Apr 2013
Chapter/Region:
South East
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stock 07 wrx, cylindar misfire, hesitation at wot
Would love some help for this situation, can't seem to figure out what's the problem.
my WRX is bone stock, no performance mods yet at all. some problems I'm seeing is: hesitation at WOT, will hold at 4-5k, take off, and hold again. a possible overboost CEL flashing, cylinder 3 misfire. Running only 93 octane and have used fuel cleaner regularly to try to eliminate an injector problem. what could it be?
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07-11-2013, 08:39 AM | #2 | |
Scooby Specialist
Member#: 171127
Join Date: Feb 2008
Chapter/Region:
MAIC
Vehicle:2005 Subaru PSM |
Quote:
Seems as though its misfiring, seems you have identified the missing cylinder. Search misfire, and stop using that fuel injector ****. If the injectors are dirty, pull them and send them off to get cleaned. |
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07-15-2013, 09:46 PM | #3 |
Scooby Newbie
Member#: 362438
Join Date: Jul 2013
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Clean the MAF i had the same problem and MAF was dirty as heck.
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07-17-2013, 12:53 AM | #4 |
Scooby Newbie
Member#: 354456
Join Date: Apr 2013
Chapter/Region:
South East
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07-18-2013, 01:47 AM | #5 |
Scooby Newbie
Member#: 361994
Join Date: Jul 2013
Vehicle:2005 STI Silver |
I'm having the same issue... Did compression test, leak down, all good, new plugs and coilpacks still cylinder 4 misfire....
Clogged injector?? |
07-18-2013, 09:34 AM | #6 |
Scooby Newbie
Member#: 286925
Join Date: Jun 2011
Chapter/Region:
MWSOC
Location: Northern Kentucky
Vehicle:2006 Impreza WRX White |
This could be the starting signs of a coil going out... My car did this when I first bought it if I was on the hwy for a long period of time always the same cylinder. A year later the coil went out all the way...
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07-18-2013, 12:23 PM | #7 |
Scooby Specialist
Member#: 241943
Join Date: Mar 2010
Location: NNJ
Vehicle:2065 Magic Carpet Swirl Rally Bleu |
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07-19-2013, 01:45 AM | #8 |
Scooby Specialist
Member#: 216768
Join Date: Jul 2009
Chapter/Region:
NWIC
Location: TACOMA
Vehicle:2016 STI HYPER BLUE |
Check all the vacuum lines. Better yet, get a smoke test done at the shop. A vacuum leak could cause a misfire.
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07-19-2013, 02:15 AM | #9 |
Scooby Specialist
Member#: 356215
Join Date: May 2013
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From my experience if it's a injector problem, not always, the engine idles really rough. Try swapping out coil packs to the next cylinder see if the misfire follows the cylinder it was swapped too. Since it's the 3rd cylinder( top passenger side) swap below the 1st which is located in the bottom towards the radiator. Change plugs too if that hasn't already been done. It could be numerous thing, vacuum leak, o-ring from injectors, wiring, fuel rail lifting up only at wot at certain boost pressure, best thing to do is to get a smoke test done like someone already mentioned and if that passes a cylinder leak test to see if that cylinder or motor is healthy. If you have someone with a tactrix cable locally you even log your car to see where it's at and maybe see if it has a leak or not.
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07-19-2013, 06:03 AM | #10 |
Scooby Newbie
Member#: 354456
Join Date: Apr 2013
Chapter/Region:
South East
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Thanks for the suggestions, I replaced the plugs and my cylinder misfire cel went away.
However my other problem still occurs. hesitation and bucking at wot, car gets to about 5k (sluggishly) and just hits a wall. I'm definitely going to take some suggestions from here, but could this be a possible overboosting problem? |
07-19-2013, 06:17 AM | #11 |
Scooby Specialist
Member#: 356215
Join Date: May 2013
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Do you have a boost gauge? It could be overboosting as it seems like your hitting fuel cut, have you thrown any codes for overboosting like p0244 or so? Run wastegate boost pressure by connecting just 1 single hose to the wastegate nipple and to the turbo compressor nipple where your turbo is and do a wot pull again if hesitation is still there then we can rule that out to some extent. Quit doing those wot pulls for the meantime to avoid any possible catastrophic failure. Check for leaking/cracked boost lines or loose lines on the turbo hoses as well.
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07-19-2013, 03:20 PM | #12 |
Scooby Newbie
Member#: 354456
Join Date: Apr 2013
Chapter/Region:
South East
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No, haven't thrown any turbo specific codes, closest would be a "system too lean" code that went away shortly.
All the lines look good to me, I'm about to just bite the bullet and take it to a mechanic. |
07-20-2013, 04:48 AM | #13 |
Scooby Newbie
Member#: 286925
Join Date: Jun 2011
Chapter/Region:
MWSOC
Location: Northern Kentucky
Vehicle:2006 Impreza WRX White |
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