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07-10-2018, 11:34 AM | #1 |
Scooby Newbie
Member#: 456717
Join Date: Oct 2016
Location: MA
Vehicle:15 Sti DGM |
CEL's got me all over the place
So the car is a 15 wrx sti with 70k miles.
Mods- ELH and Catless DP with Protune. Issue- Misfiring and strong hesistation when under heavy load. CEL's- P0302, P0352 What i have replaced so far using all OEM Subaru parts- Replaced all 4 coils- Replaced all 4 spark plugs Replaced purge valve Cleaned the MAF sensor Added Techron Fuel injector cleaner What im replacing next is the fuel pump with an AEM one. Im at a loss, all i can think of next is maybe an injector in cyl 2?
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07-11-2018, 08:13 AM | #2 |
Scooby Newbie
Member#: 458056
Join Date: Nov 2016
Chapter/Region:
NESIC
Location: NY/CT
Vehicle:2005 FXT Premium Obsidian Black Pearl |
Before you start throwing parts at it and waisting money, Understand that a P0352 and P0302 is an ignition coil system malfunction and a cylinder 2 misfire. Your misfire is very likely caused by a short/break in the cylinder 2 coil pack wire or an issue with the computer that controls the ignition since you have new coil packs and spark plugs. Other experts will know more than I do about the electronic components.
Just for future reference, Its easier and cheaper to swap expensive parts like coil packs and injectors from other working cylinders to see if the issue moves with the part, rather than replacing all of them right away. Ask me how I know |
07-11-2018, 02:25 PM | #3 |
Scooby Specialist
Member#: 375462
Join Date: Dec 2013
Chapter/Region:
NWIC
Location: Portland, OR
Vehicle:2006 Impreza WRX STI WR Blue |
How much boost are you tuned to, and how 'pro' is your 'protune' (i.e. who did the tune...)?
You've addressed a possible bad coil/plug on the no.2 cylinder so there are two possibilities - bad ECU pin/wiring (uncommon but it happens... I personally had an injector wire back out of an OEM harness plug last year) or unsafe tune (noted that you only experience this under heavy load). Wiggle the under-hood harnesses while the engine is running and see if you can cause the engine to misfire. Also, check your spark gap. Read your plugs if you can... but if you can't, I understand - unfortunately this requires killing the engine under load for your condition and pushing the car into the garage since the plugs aren't easy to access. If you do this, do NOT forget that you'll lose power brakes when you cut the motor while you're flooring it. For the unsafe tune idea, you can post your tune or a few logs (research which data-points to log, it is explained all over the forum). Chances are, the tune is locked and you won't be able to see it. You don't have a bad injector - you would get an injector open/short CEL if you did. |
07-11-2018, 03:06 PM | #4 |
Scooby Newbie
Member#: 456717
Join Date: Oct 2016
Location: MA
Vehicle:15 Sti DGM |
Yea spent a good amount on coils and plugs already but i figured what the hell, im a bit anal about maint. so i did them all anyways.
Protuned by Brentuning. But i have been tuned by them since december and have had 0 issues till now. I dont blame their tune whatsoever. As far as moving the harness around while car is running so see if anything happens, i did that aswell and nothing so far. As i have ran thru more of my fuel with the injector cleaner added in, the CEL has gone away but their is LESS misfire's but if i attempt to go WOT it will start misfiring. It definitley is smoother driving around the city as i had misfires even pulling out of a driveway before injector cleaner. This is the reason im thinking it's the injector. Tomorrow i will install a new oem one on cyl 2 and hope for the best |
07-11-2018, 07:08 PM | #5 |
Scooby Specialist
Member#: 375462
Join Date: Dec 2013
Chapter/Region:
NWIC
Location: Portland, OR
Vehicle:2006 Impreza WRX STI WR Blue |
Worth a shot, if the injector is lazy without being fully open/closed electrically, it may not throw it's specific code.
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07-13-2018, 02:16 PM | #6 |
Scooby Newbie
Member#: 456717
Join Date: Oct 2016
Location: MA
Vehicle:15 Sti DGM |
Replaced injector.
Cleared CEL Went for a test run Boom P0352 is back :| fml |
07-15-2018, 10:07 AM | #7 |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
OK, I see you going in circles. As noted that P0352 indicates a fault in the coil drive circuit so it won't be an injector issue (as already noted). Lets try using a diagnostic procedure other than swapping parts - that is so 1970's...
You need to perform the electrical tests on the wires between the ECM and #2 coil pack. Short to each other, short to power, short to ground, high resistance end to end, poor connections at each end. If you have an oscilloscope tap into the trigger wire at the coil and watch the pattern from the ECM during misfire - should be a nice evenly timed square wave signal that gets closer together with faster RPM. Given that you have a new coil/swapped coils if wiring checks out but the "primary" pattern drops out it could be the coil driver in the ECM. |
07-15-2018, 02:33 PM | #8 |
Scooby Specialist
Member#: 375462
Join Date: Dec 2013
Chapter/Region:
NWIC
Location: Portland, OR
Vehicle:2006 Impreza WRX STI WR Blue |
NoTorq - fill out your profile, once in a while you'll find someone local to help.
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07-16-2018, 08:48 AM | #9 |
Scooby Newbie
Member#: 456717
Join Date: Oct 2016
Location: MA
Vehicle:15 Sti DGM |
So i changed the fuel pump to an AEM one.
Still have an issue. No longer seem to be getting P0302 Car has it moments where it can full wot Then has moments where it hesitates/misfires? under WOT and somethings even minor ones when in low rpm and pops up with P0352. Elbert, i didnt mind changing the coil and plugs since i want the motor to be as healthy as can be. Injector i just bought one just incase it was causing the the P0302 code. And fuel pump i upgraded to future proof. But i agree on the wiring issue since it looks like that is what its probably gonna be. I hate wiring issues :| |
08-11-2018, 10:02 AM | #10 |
Scooby Newbie
Member#: 456717
Join Date: Oct 2016
Location: MA
Vehicle:15 Sti DGM |
Just to update for anyone having similar issues in the future
Well it's been over a month now. Finally solved it. I took it to Brentuning for a steering rack replacement (oem one started leaking) While doing that service they peeked into my existing issue. They couldn't narrow it down. They installed a Cobb FPR kit. Then dyno put it on the dyno and did some pulls. Car had 0 issues when on the dyno. But once you took it on the street then it would continously hesistate. I was recommended to remove my Compustar Alarm just incase that was the issue. So i removed the alarm. Still had the CEL. With no luck anywhere and Subaru not wanting to give me a wiring diagram, as i searched online a member on IWSTI named Wade-0 pm'd the diagrams i was looking for. Put the car on the lift. Started looking at the harness. And finally found it. The harness coming off the firewall was orignally ziptied when the DP was installed almost a year ago and somehow broke, So some wires were touching the COBB heatshield and the rubber melted off exposing the wire to the meal shield. Ziptied it back and BOOM issue solved |
08-20-2018, 11:45 AM | #11 |
Scooby Newbie
Member#: 456717
Join Date: Oct 2016
Location: MA
Vehicle:15 Sti DGM |
So car ran fine for a week after i zip tied the harness away from the heatshield. Had not had time to repair the wiring.
Midweek there was a big rain storm. Had to go thru a good small puddle of water. CEL popped up for P0352. Next day hot and dry the CEL went away. Im going to assume water hit the exposed wires causing the CEL to pop up. Fast forward 2 days later. Drove the car and parked it at a store. It was driving perfectly until i parked it. It no longer starts. Towed it and cut the exposed wires and spliced it with new same size wire. So the wiring issue is fixed on the end of being exposed and barely connected. Now the car still wont start. Only cranks and cranks. One thing after another. |
09-05-2018, 10:21 AM | #12 |
Scooby Newbie
Member#: 456717
Join Date: Oct 2016
Location: MA
Vehicle:15 Sti DGM |
So to update and help anyone in the future reading this.
I towed the car to Wicked Performance Group in Manchester,NH over labor day weekend. Explained to them my ongoing issues with the car. They said np and they will get it taken care of. Tuesday after labor day, i can get an email from Wicked Performance stating car is good to go. Cleaned up the wiring mess that was left over from the splicing and while checking my fuel pump found a o-ring missing on the supply line. They put a new one and bam. Cars running like a champ. 0 Cel's Glorious WOT pulls. Life is great again. Big thanks to Tom and Jay from Wicked Performance |
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